bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

AbstractNickel (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

AbstractVinyl 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

Abstract(−)‐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

AbstractThe 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

AbstractThe 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

AbstractIn 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

AbstractSymmetry 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

AbstractSynthesis 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

AbstractThe 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

AbstractForce 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

AbstractEaethiol 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

AbstractThe 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

AbstractThe 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

AbstractNeutron 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

AbstractThe 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

Abstract1 : 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

AbstractRuthenium(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

AbstractAddition 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

AbstractA 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

AbstractAbout 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

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

AbstractThe 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

AbstractGamma‐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

AbstractChloride1), 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

AbstractTrapped 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

AbstractDirect 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

AbstractFrom 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

AbstractThe 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

AbstractA 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

AbstractThe 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

AbstractSorption 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

AbstractTwo 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

AbstractIsotropic 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.