bluuebunny/crossref_metadata_2025 huggingface dataset:
Amino Acid Sequence of N‐Terminal Peptide of Normal Human Serum Albumin
Authors: Liu C.S. , Shih T. B. , Hsin M.H. , Blackwell R. Q.
Published: June 2015

From the peptic digest of normal human serum albumin., the N‐terminal peptide comprising 24 amino acid residues was obtained by means of peptide mapping. Combined uses of trypsin, α‐chymotrypsin, thermolysin, carboxypeptidase A and Dansyl‐Edman technique resulted in the elucidation of amino acid sequence of no. 1 to no. 24 as follows:

NH2‐Asp‐Ala‐His‐Lys‐Ser‐Glu‐Val‐Ala‐His‐Arg‐Phe‐Lys‐Asp‐Leu‐GIy‐Glu‐Glu‐Asn‐Phe‐Lys‐Ala‐Leu‐Val‐Leu‐COOH These sequence results agree completely with those recently published by other workers.
Parameters in the Pariser‐Parr‐Pople SCF MO Treatment
Authors: Lin Chi‐Hsiung , Su Lily L. , Wen Chung‐Ming
Published: June 2015

The variation of appointed parameter values in the Pariser‐Parr‐Pople SCF MO treatment is studied rigorously using aniline and 7‐pyrone as model systems. Their effect on computation results is never ignorable. The most dominant factor is the core charge distribution, which is required to be accurate to 0.01 electron unit if truly reasenable result is to be expected. The propriety of appointing one‐electron resonance integrals as empirical parameters in studying electronic transition energies is verified. Relative polarization Q of parameters and relative polarizability κ of interested physical observables are defined and are utilized in the comparative study on the effects of the variation of parameters in the treatment. A conclusion obtained is that it is possible to change energy factors of the system while keeping its structural factors unchanged' through the simultaneous variation of the valence‐state ionization potential and the one‐center repulsion integral of any atom in the system.
Low‐Frequency Lattice Vibrations in Organic Compounds and the Shpolskii Effect
Authors: Ting Chen‐Hansom , Kung Yu‐Hwa
Published: June 2015

In the Shpolskii effect, aromatic compounds dissolving in n‐alkanes of suitable lengths show quasi‐linear absorption and emission spectra when frozen to 77°K. Mixed crystal such as naphthalene dissolving in durene does not show fine structures above 20° K. This difference is likely due to the fact that the lattice vibrations in n‐alkanes have very low frequencies as shown in their Raman spectra at 77 °K.
Polarized Raman Spectra VIII. Ramam Intensities of Anthracene Excited by Different Laser Light
Authors: Ting Chen‐Hanson , Hsien Chi‐Chen
Published: June 2015

An Ar‐Kr ion laser was used to excite the Raman spectrum of powdered anthracene with two laser lines of 4880 and 6471 Å. There are significant differences in the intensity distribution in these two Raman spectra. These differences can be best explained by considering that Raman intensities are contributed by two allowed excited states of anthracene, and their contributions depend upon the laser frequency. From these Raman spectra, it is also possible to infer the vibrational structures in the higher energy, structureless excited state of anthracene.
Alkaloids of Senecio Taiwanensis Hayata and Senecio Morrisonensis Hayata
Authors: Lu Sheng‐Teh , Lin Chung‐Nan , Wu Tian‐Shung , Shieh Der‐Cherng
Published: June 2015

Two alkaloids, rosmarinine (I) from Senecio taiwanensis Hayata and integerrimine(II) from Senecio morrisonensis Hayata, were isolated and identified respectively.
Studies on the Alkaloids of Lotus Receptacle
Authors: Yang Tsang‐Hsiung , Chen Chi‐Ming , Lu Chang‐Sha , Liao Chen‐Long
Published: June 2015

From lotus receptacle (seed pod of Nelumbo nucifera Gaertn., four alkaloids, nuciferine (I), N‐nornuciferine (VIII), oxoushinsunine (IX) and N‐norarmepavine (X) were isolated. Identification of these bases were carried out by their spectral data and direct comparison with authentic samples. It is interesting that oxoushinsunine (IX), a cytotoxic alkaloid shows tumor inhibitory activity against nasopharynx carcinoma reported recently by D. Warthen et al13). The biscoclaurine (IV and V) and quaternary water soluble base (VI) only occures in the embryo. Comparison their alkaloids distribution in each part of Formosan lotus was listed in the Table 1.
A Spectrophotometric Study on Complex Formation of Nickel (II) and Cobalt (II) with Bromopyrogallol Red
Authors: Dhupar S. C. , Srivastava K. C. , Banerji Samir K.
Published: June 2015

Nickel (II) and Cobalt (II) form in 50% ethanolic medium, a bluish violet complex with Bromopyrogallol Red (BPR) in the mole ratio of 1:1 (Ni(II)) and 1:2 (Co(II)), both having at 620 nm, stable in the pH ranges 6.0‐7.5 and 5.5‐7.0, respectively. The thermodynamic stability constants and overall changes in the free energy of formation, enthalpy and entropy have been determined in both the cases.

Beer's law is obeyed over the concentration range 0.5‐5.0 ppm of Nickel and 0.2‐3.0 ppm of Cobalt at 620 nm. The net molar absorptivities are 1.6 × 104 and 2.9 × 104 and the sensitivities are 0.00367 and 0.00219 μg of Nickel and Cobalt per cm,/2. The effect of diverse ions on the metal ions determination is also reported.
Gamma‐Ray Induced Polymerization of Vinyl Monomers in Bagasse
Authors: Wang Ung‐Ping
Published: June 2015

Vinyl monomers such as vinyl acetate, vinyl chloride, methyl methacrylate and styrene etc., can be polymerized without catalyst into the composites of bagasse material by gamma‐radiation induced in situ liquid polymerization process. The fundamental factors, such as polymerization‐rate, effect of swelling agent, molecular weight of vinyl polymers and graft reaction between bagasse cellulose and vinyl polymers, have been investigated and discussed. The use of suitable low G‐value polar swelling agents and the application of suitable gamma dose‐rate are two key factors found to control the smooth in situ liquid polymerization system of vinyl monomers in bagasse.
Chemistry of Unsymmetrical Quarternary Carbon Compounds III. Synthesis of (‐)‐Dimethyl 2‐Cyano‐2‐Methylsuccinate and Determination of Its Absolute Configuration
Authors: Lee Kong Ko
Published: June 2015

(−)‐Dimethyl 2‐cyano‐2‐methylsuccinate ((−)‐IIIa) was synthesized from menthyl cyanoacetate ((−)‐I), and the absolute configuration of which was elucidated as (S)‐configuration by chemical correlation to the known (R)(+)‐β‐methylterbic acid ((R)(+)‐VII). (−)‐Dimethyl 2‐carbamoyl‐2‐methylsuccinate ((−)‐IV) and (−)‐methyl 3‐methyl‐2,5‐dioxo‐3‐pyrrolidinecarboxylate ((−)‐V) are also confirmed as belonging to (S)‐configuration and (+)‐3‐(1‐hydroxy‐1‐methylethyl)‐3‐methyl‐2,5‐pyrrolidinedione ((+)‐VI) is belonging to (R)‐configuration.

Preliminary experiments on racemic compounds are also described.
Complex Formation of Lead (II) with Bromopyrogallol Red
Authors: Dhupar S. C. , Srivastava K. C. , Banerji Samir K.
Published: June 2015

The complex formation of lead with Bromopyragallol Red has been studied spectrophotometrically in an attempt to establish composition, stability, thermodynamic parameters and optimum condition for determining small amounts of lead. The blue complex of lead had λmax at 630 nm (against a reagent blank). The composition as determined by different methods is 1:1 at pH 5.5±0.1. The mean value of log K, free energy (ΔG), the heat content (ΔH) and entropy change (ΔS) of the complex are found to be 6.28, −10.46 kcal/mole and 6.31 e. u. respectively at 25°C. The molecular extinction coefficient and Sendall's sensitivity is 5000 and 0.0140 μg of lead/cm2. The effect of diverse ions was examined with eighteen cations and ten anions, in the determination of lead.
A Study of Concentration Polarization on Ion Exchange Membrane Electrodialysis
Authors: Huang Ting‐Chia , Tsai Fuan‐Nan , Yu I‐You
Published: June 2015

The concentration polarization phenomena in ion exchange membrane electrodialysis have been studied with single exchange membrane cell. The limiting current densities of Asahi ion‐permselective membranes CK‐1 and CK‐2, Selemion ion‐exchange membranes CMV, AMV, DMV and ASV have been measured with Ag‐AgCl reversible electrode in various electrolyte solutions under 25°C and constant flow rate. In sodium chloride solution, the cation exchange membrane is easier to occur concentration polarization than the anion exchange membrane. The limiting current density increases as the concentration of solution increases for the same kind of ion exchange membrane. The experimental limiting current densities of Selemion CMV and AMV in NaCl, KCl, MgCl2, CaCl2, BaCl2, Na2SO4, NaOH and HCl aqueous solutions are measured. The results show that the limiting current density increases as the ion mobility and diffusivity increase, and is affected by the transference number of ion. For the mixture of electrolyte solution, there are linear relationship between limiting current density and equivalent fraction of electrolytes.
Synthesis Of N‐Substituted Maleamic Acids as Potential Hypocholesteremics
Authors: Liu Kang‐Chien , Chen Tong‐Bao , Jan Hon‐Ji , Shih Ching‐Yun
Published: June 2015

In a search for substances that might be useful hypocholesteremic agents, a series of twenty five N‐substituted maleamic acids was prepared. These compounds were produced in satisfactory yields by the aminolysis of maleic anhydride with appropriate aliphatic, aromatic and heterocyclic amines in various solvents under similar conditions. Analytical data as well as spectroscopic characterizations are provided.
Symmetry Adapted Analysis of Linear Molecules
Authors: Chen Cheng
Published: June 2015

Symmetry groups of the linear molecules belong to the C∞v and D∞h infinite groups. The symmetry adapted analysis of such types of molecule, is usually not systematically performed in the text book or paper. Since the standard formulas of symmetry adapted analysis are usually applicable for the finite groups only, one has to analyze the different subgroups of the linear molecules indirectly and correlates them with the irreducible representation of D∞h and C∞v. In this work, a systematic symmetry adapted analysis are introduced for the C∞v and D∞h molecules. It is a uniquely convenient way for molecular orbital calculations and vibrational normal mode analysis of the linear molecules.
Triorganosilyl Ethers of Benzaldehyde, m‐Methoxybenzaldehyde and Anisoles
Authors: Liu Sheng‐Lieh , Wu Rsien‐Jen , Wu Wen‐Jen , Chu Yuan‐Chieh , Lee Guo‐Jen
Published: June 2015

Synthesis of six new triorganosiloxybenzaldehydes, two m‐methoxy‐(triorganosiloxy)benzaldehydes, and seven methoxy(triorganosiloxy)benzenes are reported. From comparison of the stability of these compounds in the atmosphere, it is concluded that formyl group shows unfavorable influence and methoxy group shows favorable influence on the stability of these compounds. The oposite influences of these two groups on phenoxysilane linkage seems to connect with the oposite directiones of inductive effect of formyl group and resonance effect of methoxy group on the benzene ring.
Mossbauer Spectroscopic Study of 57Co‐Labelled Cobalt(II) Bisoxine Dihydrate
Authors: Wei Ho‐Hsiang
Published: June 2015

The chemical states of 57Fe atoms in 57Co‐labelled cobalt(II) oxinate and in iron(II) oxinate have been studied by means of Mössbauer spectroscopy. Consquently the trivalent charge state of iron atom was found in 57Co‐labelled hydrated cobalt(II) oxinate, and remarkable difference in Mössbauer parameters of ferrous ion in 51Co‐labelled cobalt(II) oxinate and iron(II) oxinate complexes are observed.
Normal Coordinate Analysis in Cartesian Space II. Planar Symmetric XYn Molecules
Authors: Lin Tien‐Pin , Ting Chen‐Hanson
Published: June 2015

Force constants of planar symmetric XYn type molecules in the Cartesian space have been derived in terms of the vibrational frequencies. The force constants and normal coordinates of some planar XY3 molecules with available isotoptic data are worked out. Further study of infrared absorption spectra of square planar XY4 complex ions will be needed for the present normal coordinate analysis.
Studies on Enethiol‐Thione Equilibrium of Some 1,5‐Disubstituted 2,4‐Dithiobiurets
Authors: Agarwai Naresh K. , Taneja Arjun D. , Srivastava K. P.
Published: June 2015

Eaethiol contents of 1, 5‐diphenyl 2, 4‐dithiobiuret (DP); 1, 5‐di‐p‐tolyl 2, 4‐dithiobiuret (DPT); 1‐phenyl 5‐p‐tolyl 2, 4‐dithiobiuret (PPT); 1‐phenyl 5‐o‐tolyl 2, 4‐dithiobivret (POT); and 1‐methyl 5‐p‐tolyl 2, 4‐dithiobiuret (MPT) have been studied by alkali titration method in methanol and by spectrophotometric method in different solvents of varying polarities, ranging from pyridine (Z, 64.0) to methanol (Z, 83.6). Free energy of tautomerisation has been calculated. The effect of substituents on the phenyl group on enethiol contents have been studied. It has been observed that temperature has no effect on enethiol‐thione equilibrium.
The Spectrophotometric Determination of Gallium (III) with Glycine Thymol Blue
Authors: Srivastava K. C. , Mehndiratta (Miss) Usha
Published: June 2015

The reaction between gallium (III) and glycine thymol blue has been studied spectrophoptometrically in order to establish the optimum conditions for determining traces of gallium. The gallium (III) glycine thymol blue complex has an absorption maximum at 560 nm against a reagent blank and is stable between pH 4.0 and 5.5. The complex has a composition 1 : 2 and a formation constant of 6.4×107 under the conditions studied. Beer's law is obeyed upto 126 μg of gallium. The net molar absorptivity has been found to be 11,000. The present method is very sensitive and rapid. Anions such as citrate and tartrate inhibit the colour development of the complex.
Normal Coordinate Analysis in Cartesian Space III. The Symmetric Nonplanar XYn Type Molecules
Authors: Lin Tien‐Pin , Ting Chen‐Hanson
Published: June 2015

The normal vibrations of tetrahedral hydride and octahedral hexafluoride have been studied in the Cartesian coordinates. Equations relating the force constants with the vibrational frequencies are derived by using symmetry coordinates. Numerical values of the force constants and normal coordinates of these molecules are tabulated.
Radiation Effect on Concentrated Potassium Hexacyanoferrate(II) Solutions
Authors: Chen J. W. , Lee Y. J. , Cheng H. S. , Yeh S. J.
Published: June 2015

Neutron irradiation was carried out on 0.2, 0.4 and 0.7 M solutions of potassium hexacyanoferrate(II) at the pH range of 2‐10. Fe(CN)51− was found when pH<5; which is consistent with the oxidation potential consideration of the slow reaction between Fe(CN)54− and OH. Fe(OH), was precipitated in the whole range of pH studied. Chemical and radiochemical yields were compared.
Radiation Effects on Concentrated Potassium Hexacyanoferrate(III) Solutions
Authors: Chen J. W. , Lee Y. J. , Cheng H. S. , Yeh S. J.
Published: June 2015

The neutron irradiated potassium hexacyanoferrate(III) solutions were analyzed for Fe(CN)64−, Fe(CN)63−, and Prussian blue. The retention values (1.1%) were constant throughout the pH and concentration ranges studied, and did not change with the length of irradiation. The complex behavior of the radiochemical yield of the Fe(CN)64− and Prussian blue was attributed to the competition of the various reactions involved in the irradiation.
Studies on Maleate and Citraconate Complexes of Lanthanum
Authors: Kachroo P. L. , Kalso‐Tra B. L.
Published: June 2015

1 : 2 complexes of lanthanum with maleic and citraconic acids have been reported. Conductance and spectrophotometric data obtained from Job's method of continued variation has been used for the determination of the composition and the values for the dissociation constants of these complexes. The dissociation constants were found to be 1.60×10−5 and 2.00×10−5 respectively for the maleate and the citraconate complexes.
Spectrophotometric Determination of Ruthenium with 2‐Amino‐3‐Hydroxypyridine
Authors: Mehta Y. L. , Garg B. S. , Katyal Mohan
Published: June 2015

Ruthenium(III) complexation with 2‐amino‐3‐hydroxpyridine is studied spectrophotometrically. The violet‐red complex (λmax 520 nm; ϵ 4460) contains metal and the ligand in 1 : 1 molar ratio, adheres to Beer's law from 0 to 16.5 µg/ml of ruthenium concentration and shows maximum and constancy in absorbance between pH 5.3 and 6.5. The complexation is used in the spectro‐photometric determination of ruthenium in coexistence with several ions including some from platinum metals.
Synthesis of 1, 2‐Bis(N‐Substituted β‐Aspartyl) Hydrazines as Potential Hypocholesteremics
Authors: Liu Kang‐Chien , Kam Sheung‐Tsam
Published: June 2015

Addition of two equivalent amounts of appropriate primary amine to the carbon‐carbon double bonds of 1, 2‐dimaleic acid hydrazine(I) in suitable solvents at room temperature of under reflux provided a number of 1, 2‐bis(N‐substituted β‐aspartyl) hydrazines (IIa‐k) in satisfactory yields. In some cases of this reaction, the mono‐aminated intermediates (IIIa‐c) were also isolated.
Spectrophotometric Determination of Palladium with Methylthymol Blue
Authors: Srivastava K. C.
Published: June 2015

A new, sensitive spectrophotometric method for the determination of palladium(II) with methylthymol blue has been developed. The palladium methylthymol blue complex has an absorption maximum at 530 nm. The colour reaction has a sensitivity of 0.005 µg of palladium/cm2 and obeys Beer's Law over the range 0.4 to 3.24 ppm of palladium. The effects of concentration of perchloric acid, reagent, heating, stability of colour and diverse ions have been investigated. The ratio of metal: ligand in the complex is 1:1 and the formation constant was calculated to be 1.18×104.
Retention of Th234 on Some Metal Sulphides
Authors: Gadia M. K. , Rai R. S.
Published: June 2015

About 99% of active thorium and almost entire inactive thorium is retained on precipitates of tin disulphide and antimony sulphide. The absorption of inactive thorium is slightly faster than active thorium. The retention of active thorium decreases in presence of inactive thorium. Analysis of retention data confirms the heterogeneous distribution of thorium over the precipitate of Sn(IV) and Sb(III) sulphides. Retention takes place by absorption when precipitate is less. In presence of greater amount of precipitate inhomogeneous distribution and diffusion of thorium ions takes place.
Spectrophotometric Studies of Cobalt(II) and Copper(II) Chelates of 2‐Picolylamine
Authors: Hseu Tong‐Ming , Tsai Yen‐Hsiang
Published: June 2015

Cobalt (II) and copper (II) chelates of 2‐picolylamine have been studied spectrophotometrically in aqueous solution. Formation of 2‐picolylamine chelates was pH dependent, and the optimum pH range of the cobalt (II) chelate was at pH 8.8‐9.6, and copper(II) chelate at 4.7‐6.8, respectively. The mole ratio of 2‐picolylamine to both of metal(II) ions was found to be 2 to 1 stoichiometry. The spectrophotometric sensitivities are 0.23γ of Co/Cm2 and 8.9γ of Cu/Cm3, at 373 mμ, pH 9.0 for Co(II) chelate and 588 mμ, pH 6.0 for Cu (II) chelate. The stability constants (logK) of the chelates CoL22+ and CuL22+ have been evaluated at a constant ionic strength of 0.10 at 20, 25, 30, 35 and 40°C. Enthalpy and entropy changes characterizing the formation of the chelates have been calculated at 25°C The results are collected as follows:

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The Reaction of Indole with Propiolic Acid
Authors: Zee S. H. , Chen C. S.
Published: June 2015

The reaction of indole with propiolic acid ia 1 : 1 mole ratio gave an adduct (I) of 2 : 1 addition with decarboxylation. The reaction of indole with propiolic acid methyl ester gave a 2 : 1 adduct (II). Hydrolysis of adduct II yield the corresponding carboxylic acid (IV). Decarboxylation of IV also gave I. The mechanism of title reaction were fully studied.
Gamma Ray Induced Gaseous Phase Polymerization and Copolymerization of Vinyl Monomers in Bagasse
Authors: Wang Ung‐Ping
Published: June 2015

Gamma‐ray induced gaseous phase in situ polymerization of vinyl chloride and copolymerization of vinyl chloride with vinyl acetate in bagasse have been investigated and discussed. The prepared bagasse‐plastic combinations were not improved of its mechanical strength owing to the deposited PVC powder and the low copolymer loading in bagasse‐board. The viscosity average molecular weight of PVC formed in bagasse‐board was found to be slightly higher than that of PVC formed in the in situ liquid polymerization system. No graft reaction of PVC onto bagasse cellulose was observed, while low grade of graft reaction was confirmed with PVC‐PVAc copolymer system.
Chloride, ‐Hydride and ‐Borohydride Derivatives of Difluorenyl Thallium(III)
Authors: Kumar N. , Shapma R. K.
Published: June 2015

Chloride1), borohydrides2) and hydrides3) of dicyclopentadienyl thallium (III) and diindenyl thallium (III) have already been reported. The present communication deals with a study on the preparation and characterization of difluorenyl thallium (III) chloride, ‐hydride and ‐borohydride.
Phenomenology of EPR Trapped Electron Spectra Produced by Photoionization in Alkalines at 4.2°k and 77°k
Authors: Lin D.P.
Published: June 2015

Trapped electrons, ec−, are produced by photoionization of K4Fc(CN)6 in 10M NaOH/H2O and 10M NaOD/D2O glasses at 4.2°K. The linewidth, ΔHms, of ec− changes reversibly between these two temperatures in contrast to the observations for organic matrics. Three proposed mechanisms including dipole relaxation of pendent molecules surrounding the electron cavity, contraction‐expansion model of cavity, and electron retrapping process are each discussed. It appears that no one physical model satisfactorily accounts for the present observations. The electron retrapping process, however, might be a better condidate for interpreting the experimental results in compatible with the optical absorption data.
Direct Trimethylsilylation of Phenanthrene and its Products—An Abnormal Silylation of Phenanthrene
Authors: Yang Mei‐Hui , Liu Sheng‐Lieh
Published: June 2015

Direct trimethylsilylation1) of phenanthrene in different molar ratio of phenanthrene/sodium/trimethylchlorosilane is reported and discussed. Instead of the aromatic silyl compounds, such as 9‐trimethylsilylphenanthrene (V), the hydroaromatic silyl compounds, such as 9, 10–bis (trimethylsilyl)‐9, 10‐dihydrophenanthrene (I) were obtained preferentially. Structure of these compounds are characterized and discussed. These silylated products have a general trend to change their properties during long time storage in the atmosphere under exposure to light. A significant difference of chemical shifts between silylated aromatic compound (V) and silylated hydroaromatic compound (I‐IV) was observed.
Studies on the Extractive Constituents of the Bark of Libocedrus Formosana Florin. I. The Structure of 6α‐Hydroxy‐7‐0X0‐Ferruginol
Authors: Kuo Y.H. , Chang B.H. , Lin Y.T.
Published: June 2015

From the acetone extractive of the bark of Libocedrus formosana Florin, a new phenolic diterpene, C20H23O3, was isolated. Its structure was elucidated as 6α‐hydroxy‐7‐oxo‐ferruginol (Ia).
Pyrolysis of Cellulose I. Effect of Diammonium Phosphate on Fire Retardation
Authors: Huang Kwang‐Shuan , Pan Kee‐Chuan , Perng Chao‐Nan
Published: June 2015

The mechanism which Diammonium Phosphate (DAP) works on cellulose, at thermal state, has been investigated. The thermal behavior was examined by differential scanning calorimetric analysis and thermogravimetric analysis. Infrared spectra of samples before pyrolysis and at several temperatures in pyrolysis were used to obtain further information regarding the pyrolysis reaction.

The effect of added DAP, in the temperature range above 200°C, alters the thermal pattern by lowering transition temperature, decreasing far formation and increasing char formation.

These observations are interpreted that DAP is acting as an acid, at thermal state, to catalize cellulose dehydration. It is the most significant contribution of fire retardation on cellulose.
A Study of Airborne Particles by Emission Spectrographic Method
Authors: Chao Ching‐Ning , Lee Shirley Lam , Tsai Hui‐Tuh , Wu Shaw‐Chii
Published: June 2015

A rapid spectrographic method was developed to analyze seven elements collected in glass fiber air filters, they were Cd, Pb, Ni, Zn, Sn, Ti and V. Direct excitation method was used for volatile elements while graphite powder was added for determining involatile elements like titanium and vanadium in a dc arc source. Limits of detection for analyzed elements were between 0.01‐0.1.μg. This simple and sensitive method was employed to analyze samples from fifteen air sampling stations in different areas of Taiwan.
A Spectrophotometric Study on Complex Formation of Chromium (VI) with Glycine Thymol Blue
Authors: Srivastav K.C. , Malathi M.
Published: June 2015

The composition and stability of the complex formed between chromium (VI) and Glycine Thymol Blue (G. T. B.) has been investigated using a spectrophotometric method. The chelate is reddish brown in colour and has λmax 570 nm against a reagent blank. The composition has been determined by different methods as 1: 1. The chelate gives maximum absorbance between pH 6.5 and 7.0. The values of log K as determined by two different methods are 5.21±0.1 and 5.24±0.1 and the values of ΔG° are −7.08±0.1 and −7.12±0.1 Kcal respectively at pH 6.8 and at 25°C.
Sorption of Certain Metal Ammine Complexes on Hydrous β‐SnO2
Authors: Kar K. R. , Srivastava R. K. , Bhushan Brij
Published: June 2015

Sorption of ammine complexes of Ni+2, Cu+2, Zn+2 and Cd+2 on hydrous Tin dioxide has been studied at different pH values. It has been found that qΔ and Kd values attain a maximum with increasing pH, beyond which a fall is observed. The selectivity quotients of the exchanger material towards competing pairs (Cu+2‐Zn+2, Cu+2‐Cd+2, Cu+2‐Ni+2) of complex ions have been measured as a function of the concentration of the external solution. The selectivity of the exchanger material towards the preferred ion decreased with increase in the concentration of the competing ions in the external solution. The selectivity and the sorption values (qδ) follow the same order.
Studies on the Constituent of the Rhizome of Solanum incanum L.
Authors: Lin Mei‐Chao , Lin Tzong‐Dann
Published: June 2015

Two steroids have been isolated from the rhizomes of Solanum incanum L. (Solanaceae), one of which is β‐sitosterol‐β‐D‐glucose, and the other is β‐sitosterol.
Isotropic NMR Shifts in Imidazole, 2‐Methyl Imidazole and n‐Methyl Imidazole Complexed with Copper (II) β‐Diketonates
Authors: Wang Sung‐Mao , Chen Jung‐Tso
Published: June 2015

Isotropic nuclear magnetic resonance shifts have been measured for imidazole (Im), 2‐methyl imidazole (2MeIm) and N‐methyl imidazole (NMeIm) adducts with Cu(AA)2, Cu(TFA), and Cu(HFA)2, where AA, TFA and HFA are anion of acetylacetone, trifluoroacetylacetone and hexafluoroacetylacetone, respectively, in deuteriochloroform solution. The pseudocontact contribution to the isotropic shifts are negligibly small and Ferrmi contact interaction is dominant in these copper complexes. The normal temperature effect and appreciable spin delocalization suggest that the imidazole and substituted imidazole adducts with Cu(chelate)2 are all six‐coordinated octahedral complexes, and consistent with our results of spectrophotometric study. In these imidazole complexes, the magnitude of the contact shifts lie in the order Cu(HFA)2>Cu(TFA)2>Cu(AA)2, which is the same as that of the stability constants for the pyridine type adduct formation found from spectrophotometric studies. For a given Cu(chelate)2, the basicity of ligand for adduct formation is in the order NMeIm>Im>2MeIm.
Charge Separation in Triafulvenes: Application of the Para‐Fluorophenyl Tag 19f NMR Method
Authors: Agranat Israel
Published: June 2015

Triafulvene (1) is the simplest [n]fulvene. Interest in triafulvenes centered on the potential contributions (in the ground state) of dipolar ‘aromatic’ structures of the type la, in which three‐membered ring assumes ‘cyclopropenium’ character2‐5). Various attempts have been made to increase these dipolar contributions by introducing electron withdrawing substituents at the exocyclic carbon atom (C4) of the triafulvene skeleton2‐6). A striking illustration of this trend is the study of the triapentafulvalene (2) system, motivated by the search for aromatic ‘cyclopropenium‐cyclopentadienide’ structures (2a)3). Cyclopropenone (3), the simplest [n]annulenone, may also fall within the category of triafulvenes formally being viewed upon as 4‐oxatriafulvene with a potential contribution of a cyclopropenium oxide (3a) structure to the ground state resonance hybride5,7,8).
Essential Oils XVII. Oil of Pogostemon Formosanus Oliv. II Isolation and Chemistry of Germacrone
Authors: Yeh Ping–Hsien
Published: June 2015

The crystalline product from the essential oil of Pogostemon formosanus, Oliv. was identified as 10‐membered ring seequiterpene ketone germacrone. Chemistry of germacrone was reinvestigated and reviewed. On the basis of the spectroscopic evidence and of the orbital symmetry rule, trans, trans‐configuration was assigned to germacrone.
Polarography of 4‐Nitrophthalic Acid
Authors: Sharma S. K.
Published: June 2015

The–NO2 group reduction in 4‐nitrophthalic acid (NPA) at dropping mercury electrode over a wide range of PH, is irreversible and diffusion controlled. Ill defined waves preceded the —NO2 group wave, were observed between PH 7 and 12 whereas at PH 5.0, a rounded maximum appears. The a. c. reduction of NPA at PH 12.0, provides two peaks, first peak corresponds to d. c. pre‐step, is essentially due to adsorption phenomena whereas other peak is the reduction wave. Using McBain Down cell and King‐cathcart equation the diffusion coefficient of NPA is 0.713×10‐3 cm2sec‐1. Six electrons are being involved in nitro group reduction and mechanism of the reduction was suggested. The kinetic parameters in absence and presence of ionic and non‐ionic surfactants were determined. The reduction process becomes more and more irreversible as surface activity of organic compounds increases. Ionic surfactants are effective in increasing the value of —log K° than the non‐ionic surfactants. The value of ana decreases regularly by the presence of compounds having regular increase of surface activity.
Pariser‐Parr‐Pople SCF MO Calculation on the Sydnone Ring
Authors: Wen Chung‐Ming , Tien Hsien‐Ju
Published: June 2015

The repulsive bond order of the sydnone ring between 2‐ and 4‐positions is very high negative and the π‐charge density carbon atom of position 4 is very small. The structure of sydnone ring are both dipolar form and mesoionic form.
The Constituents of Tinospora Dentata Diels
Authors: Chen Ih‐Sheng
Published: June 2015

From the tuberous root of Tinospora dentata Diels, a diterpenoid, columbin and two alkaloids, palmatine and jatrorrhizine, were isolated.
Determination of Thorium and Total Rare Earths in Monazite Sand with Fluoride Electrode
Authors: Chang Fu‐Chung , Tsai Hui‐Tuh , Wu Shaw‐Chii
Published: June 2015

A new method has been proposed to determine the total rare earths and thorium in monazite sand with fluoride electrode. The total amount of thorium and rare earths could be determined by back‐titration with standard lanthanum solution in excess fluoride, and the rare earths were titrated directly with fluoride from separate sample. Fluoride electrode was used as indicator electrode. Precision and accuracy were improved by Gran's plot technique.
A Spectrophotometric Study on Complex Formation of Tungsten (VI) with Glycine Cresol Red
Authors: Srivastava K. C. , Rao P. Appa
Published: June 2015

Glycine cresol red (G. C. R) has been used as a complexometric indicator and a reagent for the spectrophotometric determination of inorganic ions1‐4. It forms stable coloured chelates iusolution with some metal ions under appropriate conditions. This communication give the composition and stability of tungsten G. C. R. Chelate.
Nuclear Magnetic Resonance Studies. IV. Proton Chemical Shifts and Coupling Constants of 2‐Norbornanols and Methyl‐Substituted 2‐Norbornanols
Authors: Liu Kwang‐Ting
Published: June 2015

The proton magnetic resonance spectra of the two isomeric 2‐norbornanols (I and II) and of eighteen of their methyl‐substituted derivatives (III to XX) under the influence of tris(dipivalomethanato)europium, Eu(dpm)3, have been measured. In all cases linear relationships between the observed shifts and the molar ratios of Eu(dpm)3 to substrate were realized. The chemical shifts obtained from the extrapolation to zero concentration of Eu(dpm)3 are in good agreement with the observed values. The coupling constants were found to be essentially unaffected by Eu(dpm)3. Consequently, determination of a chemical shift by extrapolation or of a coupling constant from the shifted spectrum appears to be justified. Reassignments of a number of signals are discussed. Chemical shifts, normalized induced shifts, and coupling constants are tabulated.
Synthesis and Characterization of Copper(II) and Nickel(II) Complexes of 1, 2–Cyclohexanediaminedipropanamide
Authors: Ojima Heijiro , Nonoyama Kiyoko
Published: June 2015

Complexes of cupric ion and nickel ion with 1, 2‐cyclohexanediaminedipropan‐amide, prepared from cis‐l, 2‐cyclohexanediamine and acrylamide, are isolated from different acidities. Two isomeric forms for each are identified by physical means. The transition between them is observed in aqueous solution.
Studies on the Preparation and Properties of Thiol Derivatives of Biscyclopentadienyl Molybdenum (VI) and Bisindenyl Molybdenum (VI) Oxide Dichloride
Authors: Bhalla M. S. , Multani R. K.
Published: June 2015

Biscyclopentadienyl molybdenum (VI) oxide dichloride (I) and bisindenyl molybdenum (VI) oxide dichloride (II) react with various thiols in tetrahydrofuran and from the complexes of the type (C3H5)2MoO (R2) and (C9H7)2MoO (R2) wherein R may be S CH8, S C2H5, S C3HN7, S C3H7, S C4Hn9, or S C4H3 or S C3H11. The preparation, thermal stabilities, physical characteristics and infrared spectra of these complexes have been studied in this paper.
Complexes of Ruthenium and Osmium with 4‐Amino‐2‐Mercapto‐5‐Nitroso‐6‐Pyrimidinol
Authors: Kushwaha V. , Jain P. , Katyal M. , Singh R. P.
Published: June 2015

Ruthenium(III) and osmium(VIII) form coloured complexes with 4–amino −2‐mercapto‐5‐nitroso‐6‐pyrimidinol (ammonium salt). The complexes have been spectrophotometrically studied and made use of in determination of the two metals; the reaction with ruthenium is particularly sensitive (0.006 μg of ruthenium/cm2for 0.001 absorbance). Many ions do not interfere in the determination.
Spectrophotometry Determination of Iron(III) and Cobalt(II) with Salicylaldehyde Hydrazone (SH)
Authors: Ray S. H. L. , Garg B. S. , Singh R. P.
Published: June 2015

Iron and cobalt complexation with salicylaldehyde hydrazone (SH) has been studied spectrophotometrically employing solvent extraction technique. The Fe(III)‐SH (1:3) and Co‐SH (1:2) complex absorb at 510nm and 450 nm respectively. The sensitivity of the colour reactions are 0.014 and 0.005 in terms of Sandell's definition for iron and cobalt systems. Both the complexes show maximum and constant absorbance in the pH ranges 3.5 to 5.0 and 6.2 to 7.0 for Fe(III)‐SH and Co(II)‐SH respectively. The complexation has been used in the spectrophotometric determination of iron and cobalt in coexistence with several ions.
Spectroscopic Studies on the Simple Rcooh System
Authors: Kuo Ching‐Hui , Chen Tunli
Published: June 2015

The carbonyl stretching vibration of monocarboxylic acid in CCl4 solution has been investigated. We introduce a new “m‐factor” to study the polymerization of this simple RCOOH system. The value of “m‐factor” was evaluated and tested in different concentrations and temperatures. Three classes of acid polymers were found as followings: linear dimer in class I (m≃2); linear and cyclic dimers in class II (m≃4); linear, cyclic dimers, and linear trimer in class III (m≃8). A linear relationship between log K1 and (ϵ−1)/(2ϵ+1) was found.
A Study on the Competitive Permeability of Anions in Anion Exchange Membrane
Authors: Huang Ting‐Chia , Shih Jun‐Whie
Published: June 2015

The selective permeability of two species of critical ions coexisting in Solution 1 for a third species of ions of the same charge in Solution 2 penetrate through the anion exchange membrane has been studied. The competitive permeability of coexisting ions depends on various concentrations, compositions and reaction time with the restriction that the volume of solution in each compartment is finite. The species which is easy to exchange across the membrane in multi‐ionic system has a high selective permeability at small composition and high total concentration condition. The experimental result shows that there exist overshooting and depletion effects for the fast ion when the reaction time is long enough, and the higher the permselectivity TCLOH is, the more appreciable the overshooting effect is. An explanation of the overshooting and depletion effects with finite volume of solution has been made specifically in discussion.
Phytochemical Study on Moghania Strobilifera
Authors: Chen Arh‐Hwang , Lin Shinn‐Ren , Hong Ching‐Jyi
Published: June 2015

n‐C26H54, n‐C27H56, n‐C28H58, n‐C29H60, n‐C30H62, n‐C31H64, n‐C32H66, n‐C33H68, stigmasterol, β‐sitosterol and two unidentified compounds: a saturated ester (mp 79‐81°C); an unsaturated alcohol (mp 87‐88°C) were isolated from the whole herb of Moghania strotilifera.
Synthesis of a New Flavanoylchalcone
Authors: Chen Fa‐Ching , Ueng Tsong , Ho Tong‐Ing , Lin Yuh‐Meei
Published: June 2015

Acidic cyclization of 3′, 3″′‐linked 2′, 2″′‐dihydroxy‐4, 4′, 4″, 4″′, 6′, 6″′‐hexamethoxybichalcone (I) with alcoholic phosphoric acid gave a new naringenyl‐chalcon hexamethyl ether (II) along with hexa‐O‐methyl‐8,8″‐binaringenin.
NMR Studies of Internal Rotation about the C‐C Bond in 1, 1, 2‐Trisubstituted Ethanes of the type XCH2‐CHX2
Authors: Lin Wei‐Chuwan , Chen Jenn‐Shing , Chen Li‐Shu , Lin Shin
Published: June 2015

The vicinal H‐H coupling constant in the AB2 spectrum, JAB, of 1, 1, 2‐trisubstituted ethanes of the type XCH2‐CHX2 has been measured in the medium of various solvents and at several different temperatures over the range of 238°‐368°K. Based on rotational averaging and on the simple model of internal rotation about the C‐C bond, a refiend Karplus equation for the vicinal coupling constant could yield the analytical expression which describes an explicit functional dependence of the vicinal coupling constant on internal rotation parameters, and permits evaluation of ΔE, the energy difference between rotamers, at any fixed temperature.

For neat 1, 1, 2‐trichloroethane ΔE was found to keep constant over the range of temperature variation studied, while in the case of neat 1, 1, 2‐tribromoethane ΔE increases with increasing temperature in the same temperature range.

In contrast to a small temperature effect a much pronounced medium effect on ΔE was observed for both 1, 1, 2‐tribromoethane and 1, 1, 2‐trichloroethane. At any fixed temperature ΔE decreases as dielectric constant of the solvent increases.
Thermodynamic Studies on the Complexation Reactions of copper(II) Macrocyclic Tetramine Complexes with Monodentate Ligands: I. RAC‐5, 7, 7, 12, 14, 14‐Hexamethyl‐l, 4, 8, 11‐Tetraazacyclotetradecane‐Copper(II) (Blue) with‐Halide Ions
Authors: Chung Chung‐Sun , Huang Shih‐Tsorng
Published: June 2015

The possibility of a trigonal bipyramidal structure for [Cu(tet b)X]+ (blue) (where X=Cl, Br, I) is supported by the observation of two distinct d‐d bands, which are assigned as and d, dxy→d and dxz, dyz→d transitions respectively. The stability constants for the formation of [Cu(tet b)X]+ (blue) from [Cu(tet b)]z+ (blue) and X− were determined by spectrophotometric method at 25°, 35° and 45°C. The corresponding δH° and δS° values were obtained from the variations of the stability constants between 25° and 45°C
The Structure of Cadinane‐4α, 9α‐Diol‐2‐Ene
Authors: Kuo Y. H. , Hsieh S. H. , Kao S. T. , Lin Y. T.
Published: June 2015

The structure of cadinane‐4α, 9α‐diol‐2‐ene, a crystalline compound from acetone extractive of Taiwania cryptomedioides Hayata, was established by chemical behavior and spectrospcopic data.
Polarographic Behaviour and Determination of Stability Constants of Uranyl‐Ascorbate Complex
Authors: Chyan Jiann‐Song , Lai Tsai‐Teh
Published: June 2015

The complex species of UO2(HA)(H2A)+ and UO2(HA)2 were identified in the ascorbic acid solution of uranyl ion at pH<2.1 and pH>2.1, respectively. Polarographic wave was proved to be the simultaneous reduction of UO2+2 and UO2(HA)(H2A)+ at pH <2.1. However, at pH>2.1, the wave is due to the reduction of U02(HA)2 The stability constants of the two complex species were found to be 5.1×10+ and 1.0×105, respectively. The hydrolysis constant of uranyl ion in the solution of ascorbic acid was determined.
The Emission in the Acetone Photochemical System
Authors: Tong Shen‐Nan , Ho Shih‐Yeng
Published: June 2015

The emission in the acetone photochemical system has been measured as a function of irradiating time and pressure. The emission yield generally increases with increase in irradiating time at both 3130 and 2654A. The increase of emission yields is due to the sensitized phosphorescence of the product biacetyl. The higher emission yield and lower biacetyl quantum yields at 3130A than that at 2654A support for that most of the excited acetone molecules are in the triplet state at 3130A.
A Spectrophotometric Study of the Chelate of Iron (III) with Sorbohydroxamic Acid and Its Analytical Application
Authors: Liu Chuen‐Ying , Sun Peng‐Jouxg
Published: June 2015

Iron (III) chelates of sorbohydroxamic acid have been studied spectrophotometrically in aqueous solution. Formation of sorbohydroxamic acid chelates was pH dependent. The “normalized absorbance” concept proposed by Likussar and Boltz has been utilized in the continuous variation plot method of determining the composition of metal chelates and the formation constants. The mole ratio of sorbohydroxamic acid to ferric ion was found to be 1 to 1 stoichiometry at pH lower than 2. The formation constant of this chelate has been evaluated to be 6.0×1011 at a constant ionic strength of 0.1 M at 30°C A spectrophotometric determination of ferric ion with sorbohydroxamic acid was proposed in conjunction with the present work.
Complex Formation of Ytterbium (III) with Bromopyrogallol Red—A Spectrophotometric Study
Authors: Srivastava K. C.
Published: June 2015

The complex formation of Ytterbium (III) with Bromopyrogallol red has been studied. spectrophotometrically in an attempt to establish composition, stability, thermodynamic parameters and optimum conditions for determining small amounts of ytterbium. The violet complex of ytterbium has λmax at 620nm against a reagent blank. The composition determined by different methods is 1:1 at pH 6.2±0.1. The mean value of log K, free energy (ΔG), the heat content (ΔH) and entropy (ΔS) changes, of the complex are found to be 6.0, —8.1.kcal/mole, —3.5 Kcal/mole and 15.53 e.U. respectively at 30°C. The net molar absorptivity and Sandell's sensitivity is 19850 and 0.0087 μg of ytterbium /cm2. The effect of diverse ions was examined with thirteen cations and ten anions in the determination of ytterbium.
Studies on the Alkaloids of Formosan Lauraceous Plants XIX Alkaloids of lindera oldhamii hemsl. (2)
Authors: Chen Ih‐Sheng
Published: June 2015

On the further investigation, N‐nordicentrine(V) and L,‐(+)‐magnocurarine(VII) have been isolated from the trunks and leaves of Lindera oldhamii Hemsl, respectively.
PMR Study of Molecular Complex Equilibrium in Solution 4‐Substituted Nitrobenzenes with Aromatic Donors
Authors: Lin Shin , Lin Wel‐Chuwan
Published: June 2015

4‐Substituted nitrobenzenes, 4‐X‐C6H4NO2 (where X=‐Cl, ‐Br, ‐COCH2, ‐CHO), complexed with methyl benzenes in inert solvent cyclohexane have been studied by PMR spectroscopy. Equilibrium constant and the chemical shift of pure complex were determind through observation of the A2B2 spectrum of ring protons in the electron acceptor compounds. Equilibrium constant and chemical shift of pure complex were evaluated separately on the basis of either chemical shift A or B. Unequal chemical shift of pure complex was obtained and used to discuss the geometry of complex.
Studies on the Synthesis of the Sydnone Derivatives and its Properties III. Synthesis of Bissydnone
Authors: Tien Hsien‐Ju , Yeh Mou‐Yung
Published: June 2015

Two new bissydnones; 3,3′‐diphenyl‐4,4′‐bissydnone (I) and di(3‐sydnonyl)‐biphenyl (II) have been synthesized by Ullmann Reaction and Palladium chloride condensation in yields of 10‐70%.
The Structure of Epicedranediol
Authors: Kuo Y. H. , Pu Frances S. , Lin Y. T.
Published: June 2015

The structure of epicedranediol, a crystalline compound from n‐hexane extractive of Juniperus squamata Lamb., was established as 8S, 13‐cedranediol by chemical and physical evidence.
The Decarboxylation of Catechuric Acid in Cresols and Phenol
Authors: Haleem M. A. , Hakeem M. A.
Published: June 2015

Kinetic data are reported for the decarboxylation of catechuric acid in four hydroxy solvents in the temperature range 150‐180°, The parameters of the absolute reaction rate equation are calculated. The reaction is first order. The observations support the view that all the decompositions proceed through an intermediate complex mechanism.
Complexometric Determination of Trivalent Metal Ions Using 1,2‐Naphthoquinone‐4‐Sulphonic Acid‐2‐Thiosemicarbazone as Metallochromic Indicator
Authors: Kesavan S. , Garg B. S. , Singh R. P.
Published: June 2015

1,2‐Naphthoquinone‐4‐sulphonic acid‐2‐thiosemicarbazone (NQTS‐4S) has been used as visual indicator in the complexometric determination of trivalent metal ions, aluminium, gallium, indium, bismuth and iron. Simultaneous determination of aluminium and iron and of aluminium and copper has also been carried out. The standard deviation and percentage errors have also been calculated.
Triterpenoids and Some Other Constituents from Spiraea Formosana
Authors: Chou Cheng‐Jen , Wang Ching‐Bore , Lin Lung‐Ching
Published: June 2015

The ethanol extract of the stems of Spiraea formosana has been shown to contain triterpenes: friedelin (II), glutinol (III). β‐amyrin (IV); 10‐nonacosanol (I) and a mixture of sitosterol and campesterol. They were identified by chemical reactions, spectral data and compared with authentic samples (except 10‐nonacosanol).
Study on the Silylation of Aromatic Hydrocarbons. The Trimethylsilylation of Naphthalene
Authors: Yang Mei‐Hui , Liu Moon‐Lan , Liu Sheng‐Lieh
Published: June 2015

Direct trimethylsilylation of naphthalene under certain condition has been found to afford substitution as well as addition products: 1‐and 2‐trimethylsilylnaphtalene (I, II), 1‐trimethylsilyl‐1,4‐dihydronaphthalene (III), trans‐1,2‐bis(trimethylsilyl)‐1,2‐dihydronaphthalene (IV‐a) and its isomer (IV‐b), and 1,2,4‐tris(trimethylsilyl)‐1,2‐dihydronaphthalene (V). The configuration has been determined by nmr spectroscopy, and the possible reaction path was proposed.
Synthesis of N‐(Homocyclylcarbamoyl)‐Maleamic Acids and ‐Maleimides
Authors: Liu Kang‐Chien , Shih Ching‐Yun
Published: June 2015

A series of N‐homocyclylcarbamoyl derivatives of maleamic acid and maleimide was prepared for hypocholesteremic and sulfhydryl‐binding tests. The synthetic reactions involved in the controlled aminolysis of maleic anhydride with appropriate mono‐substituted ureas and the resulting carbamoylmaleamic acids were then thermally dehydrated to the corresponding carbamoylmaleimides. The monosubstituted ureas required in this synthesis were obtained by the action of amines on isocyanic acid produced in situ from nitrourea on heating in aqueous alcoholic solution.
Salicylate of Uranium
Authors: Dubey S. , Hasan M. , Kapoor R. N.
Published: June 2015

The reactions of uranium pentaethoxide with salicylic acid have been carried out in different stoichiometric ratios, yielding products of the type, U(OEt)3(C7H4O3), U(OEt)(C7H4O3)2, U(C7H4O2)2(C7H4O3), and U2(C7H4O3)3. A detailed study of the complexation reactions of uranyl ion with salicylic acid have also been made by potentiomertic and conductometric methods. The formation of 1:1 and 1:2 complexes have been confirmed by preparative studies. Two compounds, viz. (C5H6N)2UO2(C7H4O3)2 (NH4)2UO2(C7H4O3)2 have been isolated.