bluuebunny/crossref_metadata_2025_split huggingface dataset:
Stereochemical Control in Microbial Reduction. 18. Mechanism of Stereochemical Control in the Diastereoselective Reduction with Baker’s Yeast
Authors: Nakamura Kaoru , Kawai Yasushi , Miyai Takehiko , Honda Sohichi , Nakajima Nobuyoshi , Ohno Atsuyoshi 
Published: July 2006

Abstract
Reduction of a variety of 2-alkyl-3-oxobutanoates with bakers’ yeast yields the corresponding l-(3S)-hydroxy esters with exclusive enantioselectivity, while the diastereoselectivity, syn/anti ratio, varies depending on the structure of the alkoxyl moiety. In order to elucidate the mechanism for this stereochemical control, oxidoreductases that reduce 2-alkyl-3-oxobutanoate have been isolated from the cells of bakers’ yeast and purified. Two dominant competing 2-alkyl-3-hydroxybutanoate oxidoreductases have been obtained: one of them reduces 2-alkyl-3-oxobutanoates stereoselectively yielding the corresponding l-syn-hydroxy esters, whereas the other affords a mixture of l-syn- and l-anti-hydroxy esters. The experimental results on stereoselectivity have nicely been simulated using kinetic parameters elucidated.
Light-Induced Electron-Transfer Reaction into Rs. rubrum Chromatophores from a Pt Electrode
Authors: Erabi Tatsuo , Matsumoto Kiyoharu , Takahashi Noritaka , Hirata Kumiko , Wada Masanori 
Published: July 2006

Abstract
A platinum electrode immersed in a chromatophore suspension brought about, upon illumination, a cathodic photocurrent under potentiostatic conditions. The photocurrent action spectrum coincided fairly well with the absorption one of a chromatophore suspension, showing maxima at 600, 800, and 875 nm. The photocurrent increased with an increasing cathodic shift of the applied potential up to about −500 mV; two successive waves were observed on the photocurrent. The mechanism for the generation of the photocurrent is discussed.
Selective Potential Response of a Poly(N,N-dimethylaniline)/Poly(o-chloroaniline) Dual-Layer Coated Electrode to Dissolved Iodide Ions
Authors: Yano Jun 
Published: July 2006

Abstract
Poly(N,N-dimethylaniline) (PDA) was easily obtained by an anodic oxidation of N,N-dimethylaniline in acidic media. PDA is a semiconductor having positively charged sites as quaternary ammonium groups in its polymeric backbone. It was possible for a PDA-film coated electrode to incorporate I− electrostatically; I− in the film was then oxidized electrochemically. Further, the oxidized products of I− still remained in the film. Although the electrode responded to dissolved I− potentiometrically, the response was disturbed by the presence of other redox species. On the other hand, poly(o-chloroaniline) (PCA) was also easily prepared by the electro-oxidation of o-chloroaniline in acidic solutions. On a PCA-film coated electrode, only the redox wave of I2/I− was observed, though PCA, itself, was electroinactive. In other words, the PCA film responded to I− selectively. The dual-layer (a PDA film incorporated oxidized products of I− and PCA film) showed a selective Nernstian response to dissolved I−.
Biosynthesis of Mutant β-d-Galactosidases Containing Nonnatural Aromatic Amino Acids by Esherichia coli
Authors: Ueda Takehiko , Ueda Mitsuyoshi , Tanaka Atsuo , Sisido Masahiko , Imanishi Yukio 
Published: July 2006

Abstract
Mutant β-d-galactosidases containing nonnatural aromatic amino acids were produced by misincorporation during protein overproduction by Esherichia coli. The incorporation of 3-(1-pyrenyl)-l-alanine (pyrAla) was confirmed by fluorescence measurement of the produced enzyme, although the replacement frequency was low. Some of mutant enzymes showed improved thermostability.
Formation of Na0.9Mo6O17 in a Solid-Phase Process. Transformations of a Hydrated Sodium Molybdenum Bronze, Na0.23(H2O)0.78MoO3, with Heat Treatments in a Nitrogen Atmosphere
Authors: Eda Kazuo , Furusawa Kouichi , Hatayama Fumikazu , Takagi Sadao , Sotani Noriyuki 
Published: July 2006

Abstract
The transformations of hydrated sodium molybdenum bronze, Na0.23(H2O)0.78MoO3, with heat treatments in a nitrogen atmosphere are as follows: Na0.23(H2O)0.78MoO3 (AD) \xrightarrowat 330 K Na0.23(H2O)0.5MoO3 (VD) \xrightarrowat 457 K Na0.23MoO3 (with VD structure) \xrightarrowat 583 K Na0.9Mo6O17 + small amount of other materials \xrightarrowat 800 and 900 Kmeit. This indicates a new and variable formation process of alkali metal molybdenum bronzes. In this process, Na0.9Mo6O17 was formed in the solid phase without the formation of any intermediate products. Its formation temperature was about 600 K, which was less than those of the usual preparation methods by about 200 K.
NMR Studies on Reorientational Motion of Hydrated D2O Molecules of Halaide Ions (F−, Cl−, Br−, and I−) in Dilute Aqueous Solutions
Authors: Shimizu Akio , Taniguchi Yoshihiro 
Published: July 2006

Abstract
The spin–lattice relaxation rates of the D and 17O nuclei of D2O molecules have been measured for dilute aqueous solutions of potassium halides (KF, KBr, KCl, KI) in the concentration range below 1.0 mol kg−1 at 25°C. The agreement between the B\barx′ coefficients of the spin–lattice relaxation rate (reorientational motion) and the B− coefficients of the solution viscosity of the anions is somewhat better than that of the cations. The reorientational motion of hydration for D2O molecules of Cl−, Br−, and I− ions was anisotropic; this anisotropic motion is enhanced with increasing ion radius. On the other hand, the hydration D2O molecule of the F− ion was approximately isotropic.
Synthesis and Absorption Spectral Properties of New Merocyanine Dyes Derived from 1,1 Diaryl-2-propyn-1-ols
Authors: Nakatsuji Shin’ichi , Yahiro Tomio , Nakashima Kenichiro , Akiyama Shuzo , Nakazumi Hiroyuki 
Published: July 2006

Abstract
A series of push-pull butadiene dyes (new merocyanine dyes) containing 3,6-bis(dimethylamino)fluorenylidene, thioxanthenylidene, or 10-(9-xanthenylidene)-9(10H)-anthrylidene chromophore was easily synthesized from the corresponding 1,1-diaryl-2-propyn-1-ol systems. Their absorption spectral properties were examined and the relationship between their light absorption properties and chemical structures is discussed in comparison with the results from PPP-SCF-CI-MO calculations. The influence of the solvent polarity on the 1⁄λmax(=wave number)-values of the dyes was investigated, and the solvatochromic nature compared with the known solvent polarity parameters such as ET30, Z, χR, πazo* on 2-[2-[3,6-bis(dimethylamino)fluorenylidene]ethylidene]-1,3-indandione.
Syntheses of Titanium Butoxide Tris(polyfluoroalkanoate) and Surface Modification of Calcium Carbonate
Authors: Yoshino Norio , Shiraishi Yukihide , Hirai Hidefumi 
Published: July 2006

Abstract
Titanium butoxide tris(5H-octafluoropentanoate), Ti(OnC4H9)[OCO(CF2)4H]3, titanium butoxide tris(7H-undecafluoroheptanoate), Ti(OnC4H9)[OCO(CF2)6H]3, titanium butoxide tris(9H-hexadecafluorononanoate), Ti(OnC4H9)[OCO(CF2)8H]3, and titanium butoxide tris(perfluorooctanoate), Ti(OnC4H9)[OCO(CF2)6CF3]3, were prepared by the reaction of titanium butoxide trichloride with sodium fluoro-substituted acylates in 1,1,2-trichloro-1,2,2-trifluoroethane. These compounds were characterized on the basis of elemental analysis as well as their IR, 1H NMR, 13C NMR, and 19F NMR spectra. In the compounds produced, a Ti–OCO bond was stable in water, although a Ti–OR bond was only moderately stable in water. A surface modification against calcium carbonate was attempted by using these products. From measurements of the contact angles θ(°) of water and toluene against a modified calcium carbonate surface, titanium butoxide tris(perfluorooctanoate) was found to be an effective substance for a new-type coupling agent, which increases the affinity between organofluoro polymers and some inorganic substances.
Physical and Chemical Properties of Mononuclear Cobalt Dioxygen Complexes with Tetraimidazolyl-Substituted Pyridine Chelates
Authors: Tamagaki Seizo , Kanamaru Yutaka , Ueno Masanori , Tagaki Waichiro 
Published: July 2006

Abstract
A new calss of mononuclear superoxocobalt complexs containing four equal imidazolyl-donors and one pyridyl-donor per cobalt(II) ion was prepared and their chemical and physical properties were compared with those of cobalt(II) Schiff-base type dioxygen complexes.
A Method for Preparing New Elongated-Shaped Silica Sols
Authors: Yoshida Akitoshi , Watanabe Yoshitane , Andoo Mikio , Tanimoto Kenji 
Published: July 2006

Abstract
An active silicic acid sol was added to a mixture of a Ca(NO3)2 aqueous solution and a NaOH aqueous solution, then the mixture was heated for several hours under stirring at 100–150°C to obtain a silica sol. The silica sol consisted of elongated-shaped colloidal particles desirable for film formation.
XANES Spectra of Co(ala)3 and Co(acac)3 in Solid and Solution
Authors: Sano Mitsuru 
Published: July 2006

Abstract
XANES spectra of [Co(ala)3] and [Co(acac)3] have been measured in solid and solution. Comparisons of spectra of the species in solid and solution give a basis for the spectral change being attributable to intermolecular interactions.
Molybdenum Pentachloride-Induced Reaction of Cyclopropyl-Substituted Carbonyl Compounds
Authors: Hirao Toshikazu , Nagata Shinichiro , Yamaguchi Makoto , Ohshiro Yoshiki 
Published: July 2006

Abstract
Molybdenum pentachloride induced the ring-opening reactions of cyclopropyl phenyl ketone or propyl 2-(trimethylsilylmethyl)cyclopropanecarboxylate to give 1-phenyl-1,2,4-trichloro-1-butene or cis-2-chloro-4-pentanolide, respectively.
Mechanism of the Reaction of NH(1Δ) with NO in Argon Matrix
Authors: Yokoyama Keiichi , Kitaike Hiroshi , Fueno Takayuki 
Published: July 2006

Abstract
Matrix-isolated hydrazoic acid HN3 admixed with NO was photolyzed by a low-pressure mercury discharge lamp. Product analysis based on the FTIR spectroscopy has revealed the formations of NH, N2O, OH, HNO, and HONO as photoproducts. From the comparisons of the amount of HN3 consumed with that of N2O produced, we conclude that the reaction of NH(1Δ) with NO proceeds mainly through the process NH(1Δ)+NO→N2O+H. The quantum yield of N2O is found to be φ1=0.7±0.1. The conclusion is in line with our previous results of the gas phase experiments at room temperature.
Synthesis of a Chiral α-(Aminooxy)arylacetic Ester. II. A Route through a Chiral 2-Hydroxy-2-phenylacetic Acid Derivative
Authors: Iwagami Hisao , Yatagai Masanobu , Nakazawa Masakazu , Orita Haruo , Honda Yutaka , Ohnuki Takashi , Yukawa Toshihide 
Published: July 2006

Abstract
A simple and practical synthetic route has been developed for the synthesis of a chiral α-(aminooxy) ester (S)-16, which is a synthetic intermediate for a potent antipseudomonal cephalosporin antibiotic M-14659. In this synthetic route, the key intermediate is α-hydroxy acid (R)-7 (100%ee), which is prepared by an asymmetric reduction of α-keto ester with NaBH4-(R,R)-tartaric acid followed by a hydrolysis and an optical resolution using l-Leu–NHNH2. (S)-16 is obtained stereoselectively through 3 steps from (R)-7. HPLC analyses and NMR studies have proved that the (S)-16 thus prepared is completely optically pure.
Synthesis of [6-(1,4,7,10-Tetraaza-12-cyclotridecyl)-1,4,8,11-tetraazacyclotetradecane]dinickel(II) Perchlorate and Its Electrocatalytic Property for Water Reduction
Authors: Mochizuki Katsura , Gotoh Hajime , Suwabe Masaaki , Sakakibara Tohru 
Published: July 2006

Abstract
A new bimacrocyclic ligand, in which 13- and 14-membered rings are linked together by a C–C bond, 6-(1,4,7,10-tetraaza-12-cyclotridecyl)-1,4,8,11-tetraazacyclotetradecane (L13−14), and its dinickel(II) complex, [NiII2L13−14]4+, were synthesized. The absorption spectra and cyclic voltammograms of [NiII2L13−14]4+ showed that it has properties of both the 13- and 14-membered rings. Cyclic voltammetry and controlled-potential electrolysis showed that [NiII2L13−14]4+ can serve as an electrocatalyst for water reduction to produce H2. The electrocatalytic efficiency for H2 produclion at −1.5 V was found to be as follows: [NiII2L14−14]4+ (L14−14: 6,6′-bi(1,4,8,11-tetraazacyclotetradecane))&gt;[NiII2L13−14]4+≈[NiIIL14]2+ (L14: 1,4,8,11 -tetraazacyclotetradecane)&gt;&gt;[NiII2L13−13]4+ (L13−13: 12,12′-bi(1,4,7,10-tetraazacyclotridecane)).
Amination of Carboxylic Acids by Reductive Fixation of Molecular Nitrogen by Glow Discharge Against Aqueous Solution
Authors: Harada Kaoru , Igari Shun-ichiro , Munegumi Toratane , Takasaki Michiaki , Shimoyama Akira 
Published: July 2006

Abstract
Amination of several carboxylic acids by reductive fixation of molecular nitrogen was achieved by glow discharge against aqueous solution of these carboxylic acids. The yield of the aminated product is the highest in the case of maleic acid among carboxylic acids used. The addition of hydrochloric acid to the reaction mixture enhances the yields of aminated products. This may be caused by the fact that chloride anion is oxidized by hydroxyl radicals to chlorate ion, and the fixation of molecular nitrogen proceeds under relatively reducing conditions.
Regiospecific Ring Opening of Epoxides with Cyanotrimethylsilane on Solid Bases: Reaction Features, and Role of Metal Cations of Solid Bases
Authors: Sugita Keisuke , Ohta Akihisa , Onaka Makoto , Izumi Yusuke 
Published: July 2006

Abstract
A new attempt of utilizing solid acids and bases for ring opening of epoxides with Me3SiCN was investigated. Solid strong bases such as calcium oxide and magnesium oxide catalyzed the regio- and chemoselective ring opening of epoxides with Me3SiCN much more effectively than homogeneous catalysts. On CaO and MgO, the reactions of unsymmetrical epoxides with Me3SiCN afforded 3-trimethylsiloxyalkanenitriles in high yields through regio- and stereoselective attack of cyanide ion on the less substituted epoxycarbon. Additionally, on CaO, 2,3-epoxy-1-alkanol derivatives were selectively converted to the corresponding C-3 opened products by the attack of cyanide ion. In these cases no isocyanides were formed. It was suggested that CaO acted as a bifunctional catalyst; the lattice oxide anions of CaO activated Me3SiCN, and simultaneously calcium ions promoted the ring opening of epoxyalkanol as Lewis acid sites.
Temperature Distribution in Tubular Solid Oxide Fuel Cell
Authors: Kanamura Kiyoshi , Yoshioka Shoji , Takehara Zen-ichiro 
Published: July 2006

Abstract
The temperature distribution in the tubular solid oxide fuel cell (SOFC) was calculated by using a finite element method. In this study, specially, the heat generation and consumption caused by the entropy changes at anode and cathode were taken into account for the calculation of temperature distribution in SOFC. In order to estimate the tendency of temperature distribution, the current distribution and the partial pressure distributions of hydrogen, steam, and oxygen were obtained from the calculation by using the simple mathematical model. From the temperature distribution in the tubular SOFC, it can be seen that the temperature difference is largest in the region of porous cathode material. This indicates that the heat generation from the entropy change of cathode reaction has the significant effect for the temperature distribution in tubular solid oxide fuel cell.
Kinetic Studies on the Quenching Reaction of the Photo-Excited [Ru(bpy)3]2+ with [Co(edta)]− in the Presence of EDTA, CDTA, and C2O42−
Authors: Yamazaki-Nishida Suzuko , Nagai Aiko , Mouri Noriko , Kawashima Satoko , Kimura Masaru 
Published: July 2006

Abstract
In the presence of a sacrificial donor (such as ethylenediaminetetraacetic acid, trans-1,2-cyclohexanediaminetetraacetic acid or oxalic acid in a deaerated aqueous solution) [Co(edta)]− is reduced to [Co(edta)]2− by quenching oxidatively the photo-excited [Ru(bpy)3]2+ ([Ru(bpy)3]2+*). The reduction rate for the [Co(edta)]− increases with an increase in the concentration of the sacrificial donor, and is kept constant at [EDTA] ≥ 0.03 mol dm−3, [CDTA] ≥ 0.01 mol dm−3, or [C2O42−] ≥ 0.07 mol dm−3 at pH 4.6. The ratio [[Co(edta)]−]reacted : [EDTA]reacted : [[Co(edta)]2−]formed=2 : 1 : 2 is obtained at pH 5.2. The reaction rates were examined as a function of the concentrations of [Co(edta)]− and [Ru(bpy)3]2+ as well as the pH, ionic strength, and temperature of the solution, and the intensity of the incident light. In the presence of oxygen, the decrease of [Co(edta)]− is greatly suppressed and the formation of the hydrogen peroxide is appreciable. The reaction mechanism is presented in order to account for the obtained results.
Disposition of Ferrocenes in β- or γ-Cyclodextrin Cavity and Consideration on the Absorption Bands of Ferrocene
Authors: Kobayashi Nagao , Osa Tetsuo 
Published: July 2006

Abstract
By comparing the induced circular dichroism (ICD) spectrum of 1,4,7,10,13-pentaoxa[13](1,1′)- ferrocenophane, I, in the presence of β-cyclodextrin (β-CDx) with that of ferrocenes (Fcs) in β-CDx or γ-CDx cavity, the disposition of Fcs in the CDxs is determined. Thus, the orientation of Fc in the Fc: β-CDx 1:1 complex and ferrocenecarboxylic acid (FcMA) in β-CDx at pH 2 is considered to be nearly parallel to the molecular axis of β-CDx, while that of Fc in the Fc: γ-CDx 1 : 1 complex, FcMA in β-CDx cavity at pH 9, and FcMA and ferrocenedicarboxylic acid (FcDA) in γ-CDx cavity appears to be close to normal to the molecular axis of the CDx. In addition, based on the ICD spectra, an intense band of Fcs at around 200 nm is assigned as a charge–transfer (CT) transition between the cyclopentadienyl (Cp) rings and iron(II). The advantage of using CDxs for the determination of the polarization direction of absorption bands of chromophore molecules is mentioned in comparison with previous methods.
Formation of Molecular Complexes with Calixarenes as Detected by Induced Circular Dichroism
Authors: Arimura Takashi , Shinkai Seiji 
Published: July 2006

Abstract
Calix[n]arenes (n=4 and 6) bearing (S)-5-oxo-2-pyrrolidinylcarbonyloxyl groups on the lower rim were synthesized. In chloroform, the hexamer bearing six (S)-5-oxo-2-pyrrolidinylcarbonyloxyl groups could “bind” ferrocenecarboxylic acid through hydrogen-bonding interactions, the complexation being conveniently detected by induced circular dichroism (ICD) spectroscopy (λmax 445 nm). On the basis of the examination of acyclic reference compounds, the appearance of the ICD band was explained as such that one pyrrolidone unit acts as a binding site and the chiral center in the neighboring pyrrolidone unit affects the transition moments in the ferrocene π-system. The association constant for the 1 : 1 complex was estimated to be 680 M−1. This is a new, convenient method for detecting the formation of molecular complexes with calixarenes in organic media.
Synthesis of 7-Substituted 6,7-Dihydro-5H-pyrrolo[3,4-b]pyridin-5-ones. Reaction of 7-Hydroxy Derivatives with Nucleophiles
Authors: Goto Takehiko , Utsunomiya Shin , Aiba Hiroshi , Hayasaka Hirotaka , Endo Mikihiro , Watanabe Reo , Ishizaki Takeshi , Sato Ryu , Saito Minoru 
Published: July 2006

Abstract
Various 7-substituted 6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-ones are synthesized by the reaction of the corresponding 7-hydroxy derivatives with nucleophiles involving active methylene compounds, aromatics, alcohols, p-toluenethiol, benzenesulfinic acid, triethyl phosphite, ammonia, and amines under acidic or basic conditions. Some synthetic applications of the products obtained are demonstrated to give a 7-methylene derivative and fused tricyclic derivatives.
The Acidic Property and Catalytic Activity of MoO3–SiO2–Al2O3
Authors: Sabu Kuzhunellil Raghavan Pillai , Rao Kalur Vijayachandra C , Nair Chandrathil Govindan Ramachandran 
Published: July 2006

Abstract
The ternary oxide system MoO3–SiO2–Al2O3 was prepared by coprecipitation method. The pH of coprecipitation has been varied from pH=2 to pH=8 and its effect on the acidic properties of the ternary oxide acidic system was studied by butylamine titration. The MoO3–SiO2–Al2O3 prepared from highly acidic solution has low acid strength. The total acid amount of the ternary oxide decreased considerably at higher pH (&gt;6) of coprecipitation. It was found that the total acid amount of MoO3–SiO2–Al2O3 containing 9.7% (by weight) of MoO3 and silica to alumina molar ratio 16.6 is very high compared with that of SiO2–Al2O3 of the same silica to alumina molar ratio. The acid strength of SiO2–Al2O3 is reduced by the incorporation of MoO3. Increase in calcination temperature increased the acid strength. The catalytic activity of MoO3–SiO2–Al2O3 was found to be very high for the alkylation of toluene with 2-propanol. The products are found to be o-cymene, p-cymene, and three isomers of diisopropyltoluenes. Reaction temperature &gt;200°C, higher liquid hourly space velocity, and higher alcohol content in the feed decreased the total conversion of 2-propanol to isopropyltoluenes. The acidic property and catalytic activity of MoO3–SiO2–Al2O3 are not considerably reduced up to four successive regeneration cycles.
Photocatalytic Activities of Bi2O3, WO3, and Fe2O3: An Assessment through Decomposition of Peroxomonosulfate in Visible Radiation
Authors: Maruthamuthu Pichai , Gurunathan Karuppusamy , Subramanian Esaikkiappan , Ashokkumar Muthupandian 
Published: July 2006

Abstract
Bi2O3 semiconductor powder (Eg=2.8–2.9 eV) was chosen for the first time to effect photocatalysis and was found to decompose peroxomonosulfate (PMS) with visible light of λ&gt;400 nm. Doping of Bi2O3 with Cu(II)-ion considerably enhanced the photocatalytic efficiency. The effects of variation of (i) the [dopant] in Cu(II)/Bi2O3, (ii) the catalyst amount, and (iii) the initial [PMS] on the rate of decomposition of PMS were investigated. It was observed that (a) 4 atomic % was the optimum [dopant] for Cu(II)/Bi2C3, (b) the rate increased linearly with increase in catalyst amount, and (c) the decomposition of PMS followed a Langmuir kinetics in the concentration range, [PMS]0=0.5–3.0×10−3 mol dm−3. A suitable reaction mechanism is proposed for the decomposition of PMS involving all the possible reactions. A comparative analysis of the photocatalytic activities of undoped and Cu(II)-doped Bi2O3, WO3, and Fe2O3 indicated that Cu(II)-doping enhances the activity of Bi2O3 to a greater extent than those observed with the other two semiconductors. This photocatalytic decomposition of PMS is one of the examples of visible light assisted reaction which otherwise takes place under UV radiation (λ≤280 nm) only.
Some Physico-Chemical Studies on Molecular Semiconductors Based on Charge Transfer Complexes of Substituted Phenothiazines with Iodine
Authors: Singh Ram Adhar , Singh Ranjana , Verma Shiva Mohan 
Published: July 2006

Abstract
The synthesis, chemical and structural characterizations, and thermal, spectral, electrical, and magnetic properties of six molecular semiconductors based on the charge transfer complexes of substituted phenothiazines namely; phenothiazine, 2-chlorophenothiazine, 2-(trifluoromethyl)phenothiazine, 2-acetylphenothiazine, N-acetylphenothiazine, and N-benzoylphenothiazine with molecular iodine have been reported in this paper. These complexes have been found to have 2 : 3 stoichiometries. X-Ray diffraction data show that first three complexes have orthorhombic structure whereas the other three are amorphous. Thermal analysis shows that the complexes are thermally stable upto 120 °C. The existence of monomeric and dimeric cationic species of phenothiazines has been proposed on the basis of spectral data. These complexes have been found to be molecular semiconductors having moderately high electrical conductivities and activation energies. The segregated stacking of phenothiazine and iodine moieties has been proposed to be responsible for high conductivity values and a mixed conductivity mechanism accounts for temperature dependence of electrical conductivities of these complexes.