Abstract:
An organic compound, a light modulating composition and a light modulating device are provided. The organic compound has a chemical structure represented by formula (I): 
       X—Ar—X   (I)
       wherein X is       
 
     
       
                 
         
             
             
         
       
     
     Ar is 
     
       
                 
         
             
             
         
       
     
     The organic compound is transparent in its neutral state. The amide group or imide group introduced into the aromatic amine not only enhances the solubility of the organic compound in the solvent, but also enhances the electrochemical stability of the organic compound.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
       [0001]    This Application claims priority of Taiwan Patent Application No. 104138432, filed on Nov. 20, 2015, the entirety of which is incorporated by reference herein. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to organic compounds, light modulating compositions, and light modulating devices employing the same. 
       BACKGROUND 
       [0003]    Light modulating devices are attractive in green energy industries due to their low driving voltage and bistability. Recently, the major part of light modulating material is inorganic oxides for longer lifetime and endurance, however, films thereof are prepared by using expensive processes and equipment such as vacuum deposition, spray pyrolysis, or sputtering. Even ignoring the cost of processing, the inorganic oxide still has shortcomings such as a slow electrochromic rate, less color variation, and the like. In an organic system, light modulating organic materials use conjugated polymer with more color variation and fast electrochromic rates. However, the conjugated compound has shortcomings such as expensive monomers, complicated synthesis, and formation by electro-polymerization. The electrochromic conjugated polymer has an appearance of deep color due to its conjugated length. Although the deep color can be lightened by applying a voltage, the conjugated polymer cannot be fully transparent. In other words, the conjugated polymer must be electrified to effect a transparent state, thereby leading to the problem of high energy consumption. 
         [0004]    Accordingly, there is a need for a novel electrochromic organic material to meet the requirements of transparency, film-firming ability, and electrochromicity. 
       SUMMARY 
       [0005]    The present disclosure relates to organic compounds, light modulating compositions, and light modulating devices employing the same. 
         [0006]    In accordance with one embodiment of the disclosure, an organic compound is provided. The organic compound has a chemical structure represented by formula (I): 
         [0000]      X—Ar—X   (I)
 
         [0000]    wherein X is 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is an alkyl, R 3  is H, an alkyl, or an alkoxy, R 4  is H, or methyl; Ar is 
         [0000]    
       
                 
         
             
             
         
       
     
       Ar′ is 
       [0007]    
       
                 
         
             
             
         
       
     
       Ar″ is 
       [0008]    
       
                 
         
             
             
         
       
     
       Ar 3  is 
       [0009]    
       
                 
         
             
             
         
       
     
         [0000]    and R 2  is H, an alkyl, or an alkoxy. 
         [0010]    In accordance with another embodiment of the disclosure, a light modulating composition is provided. The composition includes a first oxidizable compound, a reducible compound, an electrolyte and a solvent, wherein the first oxidizable compound includes the aforementioned organic compound. 
         [0011]    In accordance with another embodiment of the disclosure, a light modulating device is provided. The light modulating device includes a pair of electrodes, an isolating unit and a light modulating composition. The pair of electrodes includes a first transparent substrate with a first transparent conductive layer on a surface of the transparent substrate and a second transparent substrate with a second transparent conductive layer on a surface of the transparent substrate. The pair of electrodes is disposed by arranging the first transparent conductive layer and the second transparent conductive layer to face each other. The isolating unit inserted between the first and second transparent conductive layers to form a cell. Then, the light modulating composition is filled in the cell. The composition includes a first oxidizable compound, a reducible compound, an electrolyte and a solvent. The first oxidizable compound includes the aforementioned organic compounds. 
         [0012]    A detailed description is given in the following embodiments with reference to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The disclosure can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
           [0014]      FIG. 1  shows a light modulating device in one embodiment of the disclosure; 
           [0015]      FIG. 2  shows cyclic voltammetry diagrams of organic compounds in the Examples of the disclosure; 
           [0016]      FIG. 3  shows cyclic voltammetry diagrams of organic compounds in the Examples of the disclosure; 
           [0017]      FIG. 4  shows transmittance spectra of neutral and oxidation state of organic compounds in the Examples of the disclosure; 
           [0018]      FIG. 5  shows transmittance spectra of neutral and oxidation state of organic compounds in the Examples of the disclosure; 
           [0019]      FIG. 6  shows transmittance spectra of neutral and oxidation state of light modulating device in the Examples of the disclosure; 
           [0020]      FIG. 7  shows transmittance spectra of a light modulating device after switching cycles in the Examples of the disclosure; and 
           [0021]      FIG. 8  shows transmittance spectra after different voltages applied to a light modulating device in the Examples of the disclosure. 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    In accordance with some embodiments of the disclosure, an organic compound is provided. The organic compound has a chemical structure represented by formula (I): 
         [0000]      X—Ar—X   (I)
 
         [0000]    wherein X can be 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  can be an alkyl, R 3  can be H, an alkyl, or an alkoxy, R 4  can be H, or methyl; Ar can be 
         [0000]    
       
                 
         
             
             
         
       
     
       Ar′ is 
       [0023]    
       
                 
         
             
             
         
       
     
       Ar″ is 
       [0024]    
       
                 
         
             
             
         
       
     
       Ar 3  is 
       [0025]    
       
                 
         
             
             
         
       
     
         [0000]    and R 2  can be H, an alkyl, or an alkoxy. 
         [0026]    In one embodiment, R 1  can be a C1-8 alkyl group. 
         [0027]    In one embodiment, R 1  can be a C1-4 alkyl group. 
         [0028]    In one embodiment, R 2  can be hydrogen, a C1-8 alkyl group, or a C1-8 alkoxy group. 
         [0029]    In one embodiment, R 2  can be a C1-4 alkyl group, or a C1-4 alkoxy group. 
         [0030]    In one embodiment, R 3  can be hydrogen, a C1-8 alkyl group, or a C1-8 alkoxy group. 
         [0031]    In one embodiment, R 3  can be a C1-4 alkyl group, or a C1-4 alkoxy group. 
         [0032]    The organic compounds can be prepared from the reaction of carboxylic acids with diamine. The intermediate product of the diamine, dinitro can be prepared according to literature methods and then the diamine can be obtained from the dinitro through reduction as shown in Formula 2 or 3 below (J. Polym. Sci. Part A: Polym. Chem. 2006, 44, pp4579-4592, the entire disclosure of which is incorporated herein by reference). Ar′, Ar″, and R2 in Formulas 2 and 3 have the same meaning as defined in the above Formula (1). The aforementioned organic compounds are applicable as an electrochromic element, a semiconductor, a solar cell, an organic electroluminescent element, an active substance of a non-linear material, etc. 
         [0000]    
       
                 
         
             
             
         
       
       
                 
         
             
             
         
       
     
         [0033]    In accordance with some embodiments of the disclosure, the disclosure also provides an organic compound having a structure represented by the following formula: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein R 5  can be a C1-8 alkyl group. 
         [0034]    In accordance with some embodiments of the disclosure, the disclosure also provides an organic compound having a structure represented by the following formula: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein R 4  can be a C1-8 alkyl group. 
         [0035]    In accordance with some embodiments of the disclosure, the disclosure also provides an organic compound having a structure represented by the following formula: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein R 6  can be a C1-8 alkyl group. 
         [0036]    In accordance with some embodiments of the disclosure, the disclosure also provides an organic compound having a structure represented by the following formula: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein R 4  can be a C1-8 alkyl group. 
         [0037]    According to an embodiment of the disclosure, the aforementioned organic compound can be used as a first oxidizable compound which can be combined with a reducible compound, an electrolyte and a solvent to form a light modulating composition. In one embodiment, the oxidizable compound and the electrolyte have a molar ratio of 1:1 to 1:20, and the reducible compound and the electrolyte have a molar ratio of 1:1 to 1:20. 
         [0038]    In some embodiments, the electrolyte may contain at least one inert conducting salt. Examples of suitable inert conducting salts include lithium salts, sodium salts and tetraalkylammonium salts, such as tetrabutylammonium. Suitable solvents include solvents which are redox-inert at the voltages selected and which cannot dissociate to form electrophiles or nucleophiles or themselves react as sufficiently strong electrophiles or nucleophiles and thus could react with the colored ionic free radicals. Examples of suitable solvents include propylene carbonate (PC), gamma-Butyrolactone (GBL, γ-butyrolactone), acetonitrile, propionitrile, glutaronitrile, methylglutaronitrile, 3,3′-oxydipropionitrile, hydroxypropionitrile, dimethylformamide, N-methylpyrrolidone, sulfolane, 3-methylsulfolane or mixtures thereof. The concentration of the electrolyte can be between 0.01M and 1.5M. 
         [0039]    In some embodiments, the reducible compound can be selected from the group consisting of 
         [0000]    
       
                 
         
             
             
         
       
     
         [0040]    In some embodiments of the disclosure, the oxidizable compound can include a second oxidizable compound, which can be 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    or the combinations thereof, wherein R 8  is H or an alkyl group. 
         [0041]    In accordance with some embodiments of the disclosure, a light modulating device can be provided. As shown in  FIG. 1 , the light modulating device includes a pair of electrodes, an isolating unit and a light modulating composition. The pair of electrodes  12 ,  18  includes a first transparent substrate  11  with a first transparent conductive layer  13  on a surface of the transparent substrate and a second transparent substrate  19  with a second transparent conductive layer  17  on a surface of the transparent substrate  19 . The pair of electrodes  12 ,  18  is disposed by arranging the first transparent conductive layer  13  and second transparent conductive layer  17  to face each other. The isolating unit  14  is inserted and sealed up between the first and second transparent conductive layers  13 ,  17  to form a cell  15 . Then, via a port (not shown) on the isolating unit  14 , the aforementioned light modulating composition is introduced into the cell  15 . The port was sealed so that the light modulating device  10  is formed. 
         [0042]    In some embodiments of the disclosure, the transparent substrates can be made of glass or plastic such as polycarbonate. The conductive layer can be made of indium tin oxide (ITO), antimony- or fluorine-doped tin oxide, antimony- or aluminum-doped zinc oxide, tin oxide or conductive organic polymers such as, for example, optionally substituted polythienyls, polypyrroles, polyanilines, polyacetylene. 
         [0043]    In some embodiments of the disclosure, the isolating unit can be formed by blending spacer elements with a thermosetting or photochemically curable adhesive. Spacer elements can be small spherules of plastic or glass or certain sand fractions 
         [0044]    In some embodiments of the disclosure, the distance from the first conducting material layer to the second conducting material layer can be between 10 μm to 200 μm. 
         [0045]    The light modulating device will change from colorless to a specific color (e.g. yellow green, sky blue, blue, deep blue, or deep purple) after being applied with a suitable voltage. The specific color and the voltage depend on the chemical structure of the organic oxidizable compound of the light modulating composition. After the voltage is switched off, the cell contents completely bleach once more within 1 min. The experiments described below show that the cell still worked satisfactorily after operating 10,000 coloring/bleaching cycles. In other words, the light modulating composition solution has good stability. 
         [0046]    Below, exemplary embodiments will be described in detail with reference to the accompanying drawings so as to be easily realized by a person having ordinary knowledge in the art. The inventive concept may be embodied in various forms without being limited to the exemplary embodiments set forth herein. Descriptions of well-known parts are omitted for clarity, and like reference numerals refer to like elements throughout. 
       EXAMPLES 
       [0047]    In the following Examples, the electrochemical analysis was performed by CH Instruments 612C to scan potentials of the thin film. The cyclic voltammetry (CV) was performed by a three-electrode system, wherein the ITO glass served as a working electrode (the coated polymer had an area of about 2.0 cm×0.8 cm), an Ag/AgCl electrode (in saturated KCl solution) served as a reference electrode, a platinum wire served as an auxiliary electrode, 0.1M of tetrabutylammonium perchloride solution (in acetonitrile) served as an electrolyte, and a scan rate was 50 mV/s. The average value of a redox potential was defined as a half-wave potential. 
       Example A1 
     Preparation of Organic Compound (A1) 
       [0048]    10.0 g of 4-methoxytriphenylamine-based diamine (compound (I)) and 6.4 g of isobutyric acid (compound (II)) were mixed in a reaction flask. 25 ml of Dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and 20.3 g of Triphenyl Phosphate (TPP) and 5.68 g of pyridine serving as a catalyst were then added into the reaction flask. The mixture in the reaction flask was heated to 105° C. for 4 hours, and then cooled down to room temperature. The cooled reaction mixture was poured into ethanol to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (A1) (white solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0049]    The physical measurement of the compound (A1) is listed below: 1H NMR (500 MHz, DMSO-d 6 ): δ 1.02 (d, J=7.0 Hz, 6H), 2.49 (m, 2H), 3.66 (s, 3H), 6.78 (d, J=9.0 Hz, 4H), 6.81 (d, J=8.5 Hz, 2H), 6.87 (d, J=8.5 Hz, 2H), 7.41 (d, J=9.0 Hz, 4H), 9.65 (s, 2H). 13C NMR (125 MHz, DMSO-d6): δ 19.5, 34.8, 55.2, 114.8, 120.4, 122.9, 125.7, 133.9, 140.5, 143.0, 155.2, 174.8. Anal. calcd for C 27 H 31 N 3 O 3 : C, 72.78; H, 7.01; N, 9.43; found: C, 72.69; H, 7.03; N, 9.51. 
         [0050]    The compound (A1) has a cyclic voltammetry CV diagram as shown in  FIG. 2 , redox potential as tabulated in Table 1 below, the transmittance spectrum of neutral and oxidation state as shown in  FIG. 4 , and the transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
       Example A2 
     Preparation of Organic Compound (A2) 
       [0051]    10.0 g of 4-methoxytriphenylamine-based diamine (compound (I)) and 8.4 g of cyclohexanoic acid (compound (III)) were mixed in a reaction flask. 25 ml of Dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and 20.3 g of Triphenyl Phosphate (TPP) and 5.68 g of pyridine serving as a catalyst were then added into the reaction flask. The mixture in the reaction flask was heated to 105° C. for 4 hours, and then cooled down to room temperature. The cooled reaction mixture was poured into ethanol to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (A2) (white solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0052]    The physical measurement of the compound (A2) is listed below: 1H NMR (500 MHz, DMSO-d 6 ) δ 1.13-1.44 (m, 10H), 1.63-1.79 (m, 10H), 2.29 (t, 2H), 3.72 (s, 3H), 6.84 (d, J=9.0 Hz, 4H), 6.88 (d, J=8.5 Hz, 2H), 6.95 (d, J=8.5 Hz, 2H), 7.48 (d, J=9.0 Hz, 4H), 9.67 (s, 2H). 13C NMR (125 MHz, DMSO-d 6 ): δ 13.9, 22.0, 25.1, 28.5, 28.6, 31.2, 55.2, 114.8, 120.2, 122.8, 125.8, 140.5, 143.0, 155.24, 170.8. Anal. calcd for C 33 H 39 N 3 O 3 : C, 75.4; H, 7.48; N,7.99; found C, 74.8; H, 7.45; N, 7.87. 
         [0053]    The compound (A2) has redox potential as tabulated in Table 1 below, transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
       Example A3 
     Preparation of Organic Compound (A3) 
       [0054]    10.0 g of 4-methoxytriphenylamine-based diamine (compound (I)) and 9.45 g of octanoic acid (compound (IV)) were mixed in a reaction flask. 25 ml of Dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and 20.3 g of Triphenyl Phosphate (TPP) and 5.68 g of pyridine serving as a catalyst were then added into the reaction flask. The mixture in the reaction flask was heated to 105° C. for 4 hours, and then cooled down to room temperature. The cooled reaction mixture was poured into ethanol to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (A3) (white solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0055]    The physical measurement of the compound (A3) is listed below: 1H NMR (500 MHz, DMSO-d 6 ): δ 0.86 (t, 6H), 1.26-1.59 (m, 16H), 2.51 (t, 4H), 3.73 (s, 3H), 6.85 (d, J=9.0 Hz, 4H), 6.88 (d, J=8.5 Hz, 2H), 6.95 (d, J=8.5 Hz, 2H), 7.47 (d, J=9.0 Hz, 4H), 9.76 (s, 2H). 13C NMR (125 MHz, DMSO-d 6 ): δ 13.9, 22.0, 25.2, 28.5, 28.6, 31.2, 55.2, 114.8, 120.2, 122.8, 125.8, 133.8, 140.5, 143.0, 155.2, 170.8. Anal. calcd for C 33 H 43 N 3 O 3 : C, 74.82; H, 8.18; N,7.93; found: C, 74.89; H, 8.09; N, 7.88. 
         [0056]    The compound (A3) has redox potential as tabulated in Table 1 below, the transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
       Example A4 
     Preparation of Organic Compound (A4) 
       [0057]    [please add a paragraph number here] 10.0 g of 4-methoxypentaphenylamine-based diamine (compound (V)) and 5.1 g of cyclohexanoic acid (compound (III)) were mixed in a reaction flask. 25 ml of Dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and 20.3 g of Triphenyl Phosphate (TPP) and 5.68 g of pyridine serving as a catalyst were then added into the reaction flask. The mixture in the reaction flask was heated to 105° C. for 4 hours, and then cooled down to room temperature. The cooled reaction mixture was poured into ethanol to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (A4) (white solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0058]    The physical measurement of the compound (A4) is listed below: 1H NMR (500 MHz, DMSO-d 6 ) δ 1.24-1.38 (m, 10H), 1.40-1.75 (m, 10H), 1.77 (t, 2H), 3.72(s, 6H), 6.79 (s, 4H), 6.87-6.88 (m, 6H), 6.97 (d, J=8.5 Hz, 2H), 7.47 (d, J=9.0 Hz, 4H), 9.69 (s, 2H). 13C NMR (125 MHz, DMSO-d 6 ) δ 25.2, 25.4, 29.1, 44.7, 55.2, 114.8, 120.3, 123.0, 123.2, 125.9, 134.0, 140.4, 142.0, 142.9, 155.3, 173.8. Anal. calcd for C 46 H 52 N 4 O 4 : C, 76.21; H, 7.23; N,7.73; found C, 75.95; H, 7.29; N, 7.75. 
         [0059]    The compound (A4) has a cyclic voltammetry CV diagram as shown in 
         [0060]      FIG. 3 , redox potential as tabulated in Table 1 below, the transmittance spectrum of neutral and oxidation state as shown in  FIG. 5 , and the transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
       Example B1 
     Preparation of Organic Compound (B1) 
       [0061]    1.50 g of 4-methoxytriphenylamine-based diamine (compound (I)) and 1.70 g of hexahydrophthalic anhydride (compound (VI)) were mixed in a reaction flask. 2.5 ml of Dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and a little of Isoquinoline serving as a catalyst was then added into the reaction flask. The mixture in the reaction flask was heated to 210° C. for 5 hours, and then cooled down to room temperature. The cooled reaction mixture was diluted by methanol and poured into water to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (B1) (beige solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0062]    The physical measurement of the compound (B1) is listed below: 1H NMR (500 MHz, DMSO-d 6 ) δ 1.38 (m, 4H), 1.73 (q, 4H), 3.08 (q, 2H), 3.75 (s, 3H), 6.97 (d, J=9.5 Hz, 2H), 7.02 (d, J=9.0 Hz, 4H), 7.11 (d, J=9.5 Hz, 2H), 7.14 (d, J=9.0 Hz, 4H). 13C NMR (125 MHz, DMSO-d6): δ 21.4, 23.4, 55.3, 115.4, 122.0, 126.2, 127.9, 128.1, 139.1, 147.0, 156.7, 178.8. Anal. calcd for C 35 H 35 N 3 O 5 : C, 72.77; H, 6.11; N, 7.27; found C, 72.35; H, 6.16; N, 7.25. 
         [0063]    The compound (B1) has a cyclic voltammetry CV diagram as shown in  FIG. 2 , redox potential as tabulated in Table 1 below, the transmittance spectrum of neutral and oxidation state as shown in  FIG. 4 , and the transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
       Example B2 
     Preparation of Organic Compound (B2) 
       [0064]    5.0 g of 4-methoxypentaphenylamine-based diamine (compound (V)) and 3.06 g of hexahydrophthalic anhydride (compound (VI)) were mixed in a reaction flask. 7.5 ml of dimethylacetamide (DMAc) serving as a solvent was added into the reaction flask, and a little of isoquinoline serving as a catalyst was then added into the reaction flask. The mixture in the reaction flask was heated to 210° C. for 5 hours, and then cooled to room temperature. The cooled reaction mixture was diluted by methanol and poured into water to precipitate a solid, and then filtered to collect the solid. The solid was washed by water and then dried, a compound (B2) (beige solid) was obtained. The synthesis pathway of the above reaction was as follows: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0065]    The physical measurement of the compound (B2) is listed below: 1H NMR (500 MHz, DMSO-d 6 ) δ 1.36˜1.42 (m, 8H), 1.70˜2.00 (m, 8H), 3.08 (t, 4H), 3.74 (s, 6H), 6.92˜7.10 (m, 20H). 13C NMR (125 MHz, DMSO-d 6 ): δ 21.3, 21.4, 23.3, 55.2, 115.2, 120.2, 124.9, 125.0, 127.5, 127.7, 139.4, 142.2, 147.6, 156.3, 178.8. Anal. calcd for C 48 H 46 N 4 O 6 : C, 74.40; H, 5.98; N, 7.23; found C, 74.21; H, 6.03; N, 7.27. 
         [0066]    The compound (B2) has a cyclic voltammetry CV diagram as shown in 
         [0067]      FIG. 3 , redox potential as tabulated in Table 1 below, the transmittance spectrum of neutral and oxidation state as shown in  FIG. 5 , and the transmittance of neutral and oxidation state at different wavelengths as tabulated in Table 2 below. 
         [0000]    
       
         
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Example 
                 E1 1/2  (V) a   
                 E2 1/2  (V) b   
               
               
                   
               
             
             
               
                 A1 
                 0.68 (teal) 
                 — 
               
               
                 A2 
                 0.67 (teal) 
                 — 
               
               
                 A3 
                 0.68 (teal) 
                 — 
               
               
                 A4 
                 0.46 (green) 
                 0.81 (blue) 
               
               
                 B1 
                 0.93 
                 — 
               
               
                 B2 
                 0.60 (green) 
                 0.94 (blue) 
               
               
                   
               
               
                   a E1 1/2  (V) is a half-wave potential at the first oxidation state. 
               
               
                   b E2 1/2  (V) is a half-wave potential at the second oxidation state. 
               
             
          
         
       
     
         [0068]    Table 1, Table 2 and  FIG. 1  show that triphenylamine system (compounds A1-A3 and B1) only had an oxidation-reducing peak and pentaphenyldiamine system (compounds A1-A3 and B1) had two oxidation-reducing peaks. The difference of electrical potential peak between the amido group and the imido group was large (A1vs. B1, and A4 vs. B2). By using different terminal functional groups, the redox potential of an organic compound can be modulated. 
         [0000]    
       
         
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 2 
               
             
             
               
                   
                   
               
               
                   
                 Transmittance (%) 
               
             
          
           
               
                   
                 450 
                 600 
                 700 
                 800 
                 900 
                 1000 
               
               
                 Example/T(%) 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
               
               
                   
               
             
          
           
               
                 neutral state of A1 
                 78.5 
                 78.5 
                 78.1 
                 72.7 
                 63.8 
                 49.7 
               
               
                 oxidation state of A1 
                 74.5 
                 67.5 
                 50.2 
                 36.1 
                 62.5 
                 49.7 
               
               
                 neutral state of A2 
                 79.8 
                 78.7 
                 78.1 
                 72.6 
                 63.6 
                 49.2 
               
               
                 oxidation state of A2 
                 60.9 
                 55.1 
                 33.9 
                 17.6 
                 57.3 
                 45.1 
               
               
                 neutral state of A3 
                 78.4 
                 77.8 
                 77.1 
                 71.4 
                 62.3 
                 47.6 
               
               
                 oxidation state of A3 
                 66.2 
                 61.0 
                 40.9 
                 19.3 
                 60.5 
                 49.0 
               
               
                 neutral state of B1 
                 78.6 
                 78.2 
                 77.6 
                 71.9 
                 62.8 
                 47.7 
               
               
                 oxidation state of B1 
                 53.9 
                 54.1 
                 38.6 
                 57.4 
                 59.9 
                 46.7 
               
               
                 neutral state of A4 
                 74.3 
                 75.8 
                 74.9 
                 69.2 
                 60.1 
                 45.5 
               
               
                 oxidation state of A4 
                 13.1 
                 26.8 
                 38.8 
                 24.5 
                 9.08 
                 4.65 
               
               
                 neutral state of B2 
                 76.7 
                 77.0 
                 76.6 
                 71.2 
                 61.3 
                 46.4 
               
               
                 oxidation state of B2 
                 6.98 
                 20.3 
                 19.2 
                 6.73 
                 1.81 
                 1.51 
               
               
                 neutral state of PSN c   
                 79.0 
                 78.0 
                 77.3 
                 71.3 
                 61.9 
                 47.1 
               
               
                 oxidation state of PSN 
                 34.7 
                 37.1 
                 54.2 
                 67.7 
                 60.4 
                 46.5 
               
               
                   
               
               
                   C PSN is phenothiazine as a comparative compound 
               
             
          
         
       
     
         [0069]    Table 2, 3 and  FIG. 4  show that the shielding effect of the triphenylamine system (compounds A1 and B1) was better than the shielding effect of PSN in the visible region. The pentaphenyldiamine system had absorption in the visible region and good heat-ray absorption in the NIR region. In. other words, the pentaphenyldiamine system compounds had property of anti-ultraviolet activity and absorption in the NIR region. 
       Example C1 
     Preparation of a Light Modulating Device 
       [0070]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A2 and viologen [(HV(BF 4 ) 2 ] was dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A2 was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50m. The light modulating device was applied a voltage of 1.4V to measure the transmittance of the device as tabulated in Table 3 below. 
       Example C2 
     Preparation of a Light Modulating Device 
       [0071]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound B1 and viologen [(HV(BF 4 ) 2 ] were dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound B1 was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. The light modulating device was applied a voltage of 1.6V to measure the transmittance of the device as tabulated in Table 3 below. The transmission spectrum of the neutral state (off-state) and oxidation state (on-state) of the device obtained as shown in  FIG. 6 . 
       Example C3 
     Preparation of a Light Modulating Device 
       [0072]    Tetrabutyl ammonium tetrafluoroborate (TBABF4) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A4 and viologen [(HV(BF4)2] was dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A4 was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50m. The light modulating device was applied a voltage of 1.1V to measure the transmittance of the device as tabulated in Table 3 below. 
       Example C4 
     Preparation of a Light Modulating Device 
       [0073]    Tetrabutyl ammonium tetrafluoroborate (TBABF4) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound B2 and viologen [(HV(BF4)2] was dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound B2 was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 m. The light modulating device was applied a voltage of 1.3V to measure the transmittance of the device as tabulated in Table 3 below. 
         [0000]    
       
         
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 3 
               
             
             
               
                   
                   
               
               
                   
                 Oper- 
                   
               
               
                   
                 ating 
               
               
                   
                 volt- 
                 Transmittance (%) 
               
             
          
           
               
                   
                 age 
                 450 
                 600 
                 700 
                 800 
                 900 
                 1000 
               
               
                 Device 
                 (V) 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
               
               
                   
               
             
          
           
               
                 neutral state of C1 
                 0.00 
                 76.1 
                 76.4 
                 76.4 
                 71.7 
                 63.6 
                 50.8 
               
               
                 oxidation state of C1 
                 1.30 
                 46.6 
                 2.65 
                 1.66 
                 0.15 
                 41.9 
                 38.8 
               
               
                 neutral state of C2 
                 0.00 
                 78.1 
                 78.0 
                 77.2 
                 71.5 
                 62.4 
                 47.8 
               
               
                 oxidation state of C2 
                 1.60 
                 51.8 
                 4.60 
                 3.79 
                 0.57 
                 4.76 
                 42.5 
               
               
                 neutral state of C3 
                 0.00 
                 77.2 
                 76.4 
                 76.1 
                 70.7 
                 61.9 
                 48.0 
               
               
                 oxidation state of C3 
                 1.10 
                 8.00 
                 2.46 
                 23.4 
                 18.9 
                 4.70 
                 1.84 
               
               
                 neutral state of C4 
                 0.00 
                 74.4 
                 76.0 
                 75.5 
                 69.9 
                 60.7 
                 46.3 
               
               
                 oxidation state of C4 
                 1.30 
                 16.4 
                 7.56 
                 26.9 
                 13.6 
                 4.21 
                 2.99 
               
               
                 neutral state of PSN 
                 0.00 
                 78.1 
                 76.4 
                 76.5 
                 71.2 
                 62.2 
                 47.6 
               
               
                 oxidation state of 
                 1.30 
                 29.2 
                 7.72 
                 38.0 
                 53.2 
                 49.1 
                 41.9 
               
               
                 PSN 
               
               
                   
               
             
          
         
       
     
         [0074]    Table 3 and  FIG. 6  show that the shielding effect of the Examples with added viologen was increased at wavelength around 600 nm. The shielding effect of the pentaphenyldiamine system Example C3 and C4 were larger than the shielding effect of the compounds C1 and C2 at wavelength near 400-500 nm. Compared with PSN, all Examples had the shielding effect within the range of 350-800 nm because triphenylamine and pentaphenyldiamine systems had better conjugation properties. 
       Example D 
     Preparation of a Light Modulating Device 
       [0075]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A1 and viologen [(HV(BF 4 ) 2 ] was dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A1 was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. 
         [0076]    The light modulating device was applied a voltage of 1.3V for 3.250 seconds (on-state), and was applied a voltage of −1.3V for 0.375 seconds (off-state), and then stay at 0V for 3.675 seconds. Repeating the above method, the device was subjected to a cycle life test. As shown in the transmission spectrum of  FIG. 7 , the device turned from the original neutral state which was completely free of absorption to deep blue (oxidation state) in the visible region. Moreover, After 10,000 on/off cycles the device still worked and had transmission spectrum of on/off so that the device is stable. The transmission of the device at different wavelengths and at different state was obtained and as tabulated in Table 4 below. 
         [0000]    
       
         
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 4 
               
             
             
               
                   
                   
               
               
                   
                 Transmittance(%) 
               
             
          
           
               
                   
                 400 
                 500 
                 625 
                 770 
                 800 
                 900 
               
               
                 Switching state 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
                 nm 
               
               
                   
               
             
          
           
               
                 Original neutral 
                 68.8 
                 83.0 
                 77.6 
                 73.7 
                 71.6 
                 62.8 
               
               
                 state 1st 
               
               
                 After first on 
                 0.24 
                 46.2 
                 11.2 
                 2.21 
                 6.28 
                 54.2 
               
               
                 After 11001st on 
                 0.31 
                 46.9 
                 11.7 
                 1.80 
                 5.43 
                 55.5 
               
               
                 After 11000st off 
                 66.0 
                 81.1 
                 76.9 
                 73.7 
                 71.7 
                 63.0 
               
               
                   
               
             
          
         
       
     
       Example E 
     Preparation of a Transparent-Green Complementary Light Modulating Device 
       [0077]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A1, 5,10-dimethylphenazine (DMP) and viologen [(HV(BF 4 ) 2 ] were dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A1 was 0.025M, the concentration of DMP was 0.025M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. 
         [0078]    When the light modulating device was applied a voltage ad the spectrum shows that transmission of the device reduced to 10.4% at a wavelength of 450 nm. The device turned from transparent at neutral state to deep green (oxidation state). Moreover, after switching off the voltage the device can be recovered to transparent (off-state) in 1 second. 
       Example F 
     Preparation of a Transparent-Deep Blue Complementary Light Modulating Device 
       [0079]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A1, phenothiazine (PSN), methylphenothiazine (MePSN) and viologen [(HV(BF 4 ) 2 ] were dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A1 was 0.05M, the concentration of PSN was 0.05M, the concentration of MePSN was 0.05M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. 
         [0080]    When the light modulating device was applied a voltage gradually to 1.3V, the spectrum shows that transmission of the device reduced to 10.4% at a wavelength of 450 nm. The device turned from transparent at neutral state to deep green (oxidation state). Moreover, After switching off the voltage the device can be recovered to transparent (off-state) in 1 second. 
       Example G 
     Preparation of a Transparent-Dark Complementary Light Modulating Device 
       [0081]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, compound A1, phenothiazine (PSN), methylphenothiazine (MePSN) and viologen [(HV(BF 4 ) 2 ] were dissolved in the above solution to form a light modulating composition solution, wherein the concentration of compound A1 was 0.1M, the concentration of PSN was 0.1M, the concentration of MePSN was 0.1M and the concentration of viologen was 0.1M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. 
         [0082]    When the light modulating device was applied a voltage gradually to 1.3V, the spectrum shows that transmission of the device reduced to 10.4% at a wavelength of 450 nm. The device turned from transparent at neutral state to deep green (oxidation state). The transmission spectrum of the device at different wavelengths and at different state was obtained and as shown in  FIG. 8 . Moreover, After switching off the voltage the device can be recovered to transparent (off-state) in 1 second. 
       Comparative Example H 
     Preparation of a Light Modulating Device 
       [0083]    Tetrabutyl ammonium tetrafluoroborate (TBABF 4 ) was dissolved in propylene carbonate (PC) to form a 0.5 M solution. Next, phenothiazine (PSN) and viologen [(HV(BF 4 ) 2 ] was dissolved in the above solution to form a light modulating composition solution, wherein the concentration of PSN was 0.1M and the concentration of viologen was 0.05M. Two ITO conductive glass plates were cut to the desired size and the ITO layers of the plates face each other. An isolating unit was connected with the two ITO conductive glass plates to construct a cell. Via a port on the isolating unit, the aforementioned light modulating composition is introduced into the cell so that the cell was filled with the light modulating composition solution. The port was sealed so that the light modulating device is formed. The distance between the glass plates was about 50 μm. The transmittance spectrum of neutral and oxidation state was shown in  FIG. 4 , and the transmittance of neutral and oxidation state at different wavelength was tabulated in Table 2. 
         [0084]    When the light modulating device was applied a voltage gradually t 0  1.3V, 
         [0085]    the device turned from transparent at neutral state to deep blue (oxidation state). The transmission spectrum of the device at different wavelengths and at different state was obtained and as shown in  FIG. 6 . The transmittance of the device at different wavelength was tabulated in Table 3. 
         [0086]    It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments. It is intended that the specification and examples be considered as exemplary only, with the true scope of the disclosure being indicated by the following claims and their equivalents.