bluuebunny/crossref_metadata_2025 huggingface dataset:
The Role of the Ratio of CIS Carbonyl Interaction Constants in the Force Constant Calculation and Vibrational Assignments for Some Ligand Substituted Metal Carbonyls
Authors: Lin K. C.
Published: June 2015

An empirical linear relationship between the ratio of cis interaction constants and the ratio of stretching force constants was derived and a method for determining the ratio of cis interaction constants for ligand substituted metal carbonyls was proposed. Results of the present work would enable us to assess the validity of the Cotton‐Kraihanzel approximation of k=kc and to evaluate the correctness and the reliability of Some anomalous carbonyl force constants evaluated with other methods. The reliable correlation of the ratio of stretching force constants with the ratio of interaction constants would be helpful to clarify some ambiguous vibrational assignments made previously for the carbonyl bands of metal carbonyls, or to analyze isotope spectra of carbonyl bands for other related molecules in the same series.
Chemistry of O‐Benzoquinones and Masked O‐Benzoquinones IV. Synthesis of O‐Spirodienonelactones from Unsymmetric Catechols
Authors: Chang T. H. , Chuang C. P. , Liao C. C. , Lin H. S. , Ueng Y. G.
Published: June 2015

We describe the syntheses of 6, 8‐di‐tert‐butyl‐, 7, 9‐di‐tert‐butyl., 6,7‐di‐n‐propyl and 8, 9‐di‐n‐propyl‐O‐spirodienonelactone from 3, 5‐di‐tert‐butylcatechol and 3, 4‐di‐n‐propylcatechol.
Anodic Deposition of Iodide Ion at Silver Electrode
Authors: Fan Fu‐Ren , Lin Zui‐Feng
Published: June 2015

Anodic deposition of iodide ion on silver at 25° in aqueous (0.5 M KNO3) and in 90% (w/w) ethanol‐water (0.05 M KClO4) solutions was studied galvanostatically. The exchange current density, transfer coefficient and the rate constants for the electrode reaction were evaluated. The experimental results revealed that the overall electrode reaction and the charge‐transfer step was the same one, i.e., , which might be assumed highly reversible as reflected by the exchange current density (i) and transfer coefficient (α). The numerical values of the rate constants, and at 25° were, in aqueous solution, 1.02×10−5 and 2.88×10−6, and in ethanol solution, 2.88×10−5 and 6.3×10−6 cm sec−1, respectively.
The Photochemistry of Diazomethane‐Hydrogen Sulfide Mixtures. The Decomposition Rate of Chemically Activated Methanethiol
Authors: Whang C. W. , Kao H.L. , Ho Shih Yeng
Published: June 2015

The photochemistry of diazomethane in presence of hydrogen sulfide gas has been studied at 4358 and 3660‐Å. Singlet methylene radicals react with hydrogen sulfide to from methanethiol which decomposes at lower pressures. The measured decomposition rate constants are 5.5×1010 and 9.6×1010 s−1 in 4358 and 3660‐Å systems, respectively. Singlet methylene inserts into a S‐H bond as 200 times fast as into a C‐H bond.
Foam Separation of Cadmium From Waste Water
Authors: Wu Liean‐Fang , Kuo Rui‐Chin , Huang Shang‐Da
Published: June 2015

Foam separation techniques are evaluated to determine if they would be feasible for removing cadmium (II) from waste water. Variables such as pH, ionic strength, collector concentration, and interfering ions were studied to determine their effects on separation. Sodium laury sulfate, sodium sterate, and hexadecyltrimethyl‐ammonium bromide were chosen as the collector; Fe(OH)3 and Al(OH)3 were used as the adsorbing colloid, and sodium tripolyphosphate was used as modifier. It was found that cadmium could be effectively removed using various foam separation techniques. Cadmium levels were reduced from 5 ppm to 0.003 ppm in 60 minutes foaming with sodium laury sulfate. Foam separation of cadmium sterate with hexadecyltrimethyl‐ammonium bromide was effective even at very high ionic strength, such as 1.0M NaNO3.
Autooxidation of 8S‐Hydroxycedran‐13‐Al
Authors: Kuo Yueh‐Hsiung
Published: June 2015

8S‐Hydroxycedran‐13‐al, subjected to autooxidation in three different solvents, gave eight products, from which the transformation of cedrane skeleton to acorane and decahydroazulene skeltons was observed.
Determination of Oxygen to Uranium Ratio in Uranium Dioxide Nuclear Fuel by Differential Pulse Polarography
Authors: Cheng Chin‐Tsai , Ou‐Yang Chen‐Chun , Hsu Nian‐Nan , Wu Shaw‐Chii
Published: June 2015

A differential pulse polarographic method for determination of oxygen to uranium ratio in uranium oxides is fully described. An accuracy −2.62% to +4.35% was achieved by calibrating the method against standard U3O3, replicate test runs with UO2, gave a precision of ±4.59% or better. The method is now successfully used in routine analysis for UO2 fuel.
Kinetic Studies of Catalyzed Chromic Acid Oxidation of Propionaldehyde by Picolinic Acid
Authors: Lin Tzuen‐Yeuan
Published: June 2015

The chromic acid oxidation of propionaldehyde in the presence of picoIinic acid proceeds much faster than that of propionaldehyde alone. It is shown that picolinic acid is an effective catalyst. The rate law governing this catalysis is rate=k[HCrO4−][PA]‐[CH3CH2CHO][H+]2/(a+b[H+]+c[H+]2). A mechanism consistent with the rate law was proposed: picolinic acid reacts with chromic acid to form a cyclic intermediate complex C1, C1 further reacts with a molecule of hydrated aldehyde to give a termolecular complex C2 and a hydrogen ion, C2 then undergoes oxidative decomposition in the next step to give products.
Synthesis and Mössbauer Spectroscopy Studies on the Spin States of tris(2‐Pyridylimine) Iron(ii) Complexes
Authors: Wei Ho‐Hsiang , Hsiao Ching‐Sung
Published: June 2015

Some new tris(2‐pyridylimine) complexes of iron(II) such as FeL3X2 (L = substituted imine ligand, 2‐py‐CR1=NR2, where R1 or R2=H, CH3(Me) and C4H5(Ph), X=ClO4− or NCS−, have been synthesized and their electronic structures in the solid state examined by magnetic measurement and 57Fe Mössbauer spectroscopic studies. All the perchlorate complexes FeL3(ClO4)2 are low‐spin electronic ground state of Fe(II). The dithiocyanato‐complexes, FeL3(NCS)2; the spin states of Fe(II) are dependent on substituent R1 and R2. The two complexes Fe(2‐py‐CH=NH)3(NCS)2 and Fe(2‐py‐CPh=NH)3(NCS)2 are spin‐intermediate (S=1) and Fe(2‐py‐CH=NPh)3(NCS)2 shows a thermally inducing spin transition of 5T⇄1A1, whereas the other derivatives remain a low‐spin (S=0, 1A1) ground state of Fe(II) at three temperatures of 298, 202 and 78 K.
Studies on the Syntheses of Sydnone Derivatives and Their Properties: XVI. Syntheses of 4‐Sydnonyl Tosylates by Anodic Tosylation
Authors: Tien Hsien‐Ju , Nonaka Tsutomu , Yeh Mou‐Yong
Published: June 2015

As the first synthesis of sydnone derivatives having a carbon‐oxygen bond at the 4‐position of sydnone ring, 4‐sydnonyl tosylate were successfully prepared by anodic substitution reaction.
Kinetics of Heterogeneous Isotopic Exchange Reaction in Finite Bath
Authors: Huang Ting‐Chia , Tsai Fuan‐Nan
Published: June 2015

A general method to find the rate constant and particle self‐diffusion coefficient is suggested for a heterogeneous isotopic exchange reaction which is controlled by surface mass reaction or controlled by a combination of surface mass reaction and intraparticle diffusion. The values of the kinetic parameter, ξ1 (ratio of the forward surface mass reaction rate to the intraparticle diffusion rate), particle self‐diffusion coefficient D and rate constant k are obtained by the proposed method for the isotopic exchange reaction systems CaCO3(s)/Ca2+(aq) and CaC2O4(s)/Ca2+(aq).
Molecular Structure of the Macrocyclic Ligand Complex (5, 7, 12, 14‐Tetraethyl‐7, 14‐Dimethyl‐1, 4, 8, 11‐Tetraazacyclotetra Decane) Nickel (II) Perchlorate
Authors: Lee T. J. , Lu T. H. , Liang B. F. , Chung C. S. , Lee T. Y.
Published: June 2015

The structure of macrocyclic ligand complex, (5, 7, 12, 14‐tetraethyl‐7, 14‐dimethyl‐1, 4, 8, 11‐tetraazacyclotetra decane)·NiII·(ClO4)2 has been determined by X‐ray diffraction with three dimensional counter data. This compound, C20H44N4NiII·(ClO4)2, crystallizes in orthorhombic space group Pbca, with cell parameters a=14.369, b=11.752, c=16.207 A, V=2736.8 A3, determined from Syntex Pl autodiffractomter. The formula weight (598.21) and a measured density of 1.45 gm cm−3 (by flotation) indicate the presence of four molecules per unit cell (Dc=1.452 gm cm−3). The structure was solved, using Patterson and Fourier methods and refined by full‐matrix least‐squares techniques to a reliability index, R(F) of 0.09, based on 1480 independent observed data corrected for absorption, L‐p factors. In this molecule, in addition to the usual covalent and ionic bonds, there exist two hydrogen bonds between the perchlorate ions and the amine groups. The Ni and the four N atoms are coplanar. The six membered ring subtends a larger angle (93.5(3)°) over the Ni atom than the five membered ring (86.5(3)°) does. The former belongs to the chair form and the latter pertains to the gauche form.
A Modified Kinetic Model for the Peroxydisulfate‐Iodide Reaction
Authors: Shih Yen‐Shiang , Cheng Ching‐Shang
Published: June 2015

One kinetic model for the oxidation of iodide ion by peroxydisulfate ion in aqueous solution is proposed. The reaction is regarded as \documentclass{article}\pagestyle{empty}\begin{document} {\rm S}_2 {\rm O}_8^{2 -} + {\rm I}^ - {\rm IS}_2 {\rm O}_8^{3 -} \end{document}, followed by the reaction \documentclass{article}\pagestyle{empty}\begin{document} {\rm IS}_2 {\rm O}_8^{3 -} + {\rm I}l_2 + 2{\rm SO}_4^{2 -} \end{document}. If the initial rates V are obtained from the formation of the iodine molecules, the reaction rate constant k1 and the ratio k2/k‐1 can be estimated by plotting the values of [S2O82−][I−]/V against that of 1/[I−]. The extrapolated value for k1 is 2.20×10−2 L/mol‐sec and k2/k‐1 is calculated to be 4.25×102 mol/L at 27°C in a solution with an ionic strength of 0.420.
Generalized Variation Theory—A New, Direct, Numerical Method for the Solution of General Eigenvalue‐Eigenvector Equation
Authors: Lin Chi‐Hsiung , Huang Win‐Hua , Su Chao‐Chang
Published: June 2015

A new variation theory based on the behavior of function vector in a dual vector space is presented. The procedure is applicable to any quantum mechanical eigenvalue‐eigenvector problem and gives appropriate solution even with crude numerical integration to save computational cost. The theory offers an absolute measure of propriety for the assigned trial function. Applications on a free particle with a definite momentum, a particle in a one‐dimensional box with a definite energy, the one‐dimensional harmonic oscillator, and the ground state of helium atom are shown to demonstrate the merits of the theory.
Synthesis of 2‐(4‐Quinolyl) and 2‐(3‐Quinolyl) Chromone Derivatives
Authors: Hsu Kuang‐Kann , Sun Shao‐Wen , Chen Yueh‐Hung
Published: June 2015

In continuing search of the structure‐activity relationship of heterocyclic chromones, 4‐quinolyl and 3‐quinolyl moieties were each introduced to the C‐2 position of chromones. A total of 12 quinolyl chromones were synthesized. 4‐Quinolinecarboxaldehyde was condensed with 2‐hydroxyacetophenones to provide the chalcones. These intermediates were then subjected to selenium dioxide dehydrogenation to yield the 6 new 4‐quinolyl chromones. 3‐Quinolinecarboxaldehyde was condensed with 2‐hydroxyacetophenones in the presence of dilute alkali to give aldol compounds of chalcones (dehydration products of aldols). Ring cyclization of the chalcones yielded the other 6 new 3‐quinolyl chromones.
A Sensitive Spectrophotometric Determination of Tantalum (V) with 5,7‐Diiodo‐8‐Hydroxyquinoline
Authors: Sharma Yogendu
Published: June 2015

A spectrophotometric method for the determination of trace amounts of tantalum (V) with 5–7‐diiodo‐8‐hydroxyquinoline is described. With this reagent tantalum forms a yellowish‐orange coloured complex which is stable in the pH range of 8.5–9.0. The coloured complex obeys Beer's law over the concentration range of 1–10 μg tantalum (V) ml−1 at 415 nm in aqueous solution with a molar absorptivity of 5.305×103 l mol−1 cm−1. The metal; ligand ratio ML2 was confirmed by Job's continuous variation and mole ratio methods. The method was used to determine tantalum in steels.
Spectrophotometric Estimation of Citral in Essential Oil
Authors: Nagar Meena , Baslas R.K.
Published: June 2015

Citral forms an important constituent of many essential oils. It is present in a large number of essential oils containing lemon perfume and is of great commercial value. Methods of estimation of citral, available in literature are not very accurate or time consuming. The method developed by the author is based on colour change reaction of citral with rhodium (III). If all necessary requirements for experiment are ready, the estimation of citral occures within ten minutes. Rhodium (III) can also be determined with its colour change reaction by citral.
Solvent Extraction of Vanadium(V) as a Ternary Complex with N‐Hydroxy‐N‐p‐Chlorophenyl‐N′‐(2‐Methyl‐5‐Chloro)‐Phenyl‐p‐Toluamidine Hydrochloride and p‐Chlorophenol
Authors: Patel K.S. , Deb K.K. , Mishra R.K.
Published: June 2015

N‐Hydroxy‐N‐p‐chlorophenyl‐N′‐(2‐methyl‐5‐chloro)‐phenyl‐p‐toluamidine hydrochloride (HCPMCPTH) reacts with vanadium(V) to form a 1:2 (metal:reagent) blue‐violet complex which can be quantitatively extracted into chloroform from acetic acid solutions. The deep blue adduct having 1:2:1 (V:HCPMCPTH:PCP) stoichiometry gets quantitatively extracted into chloroform from 0–2.5 M acetic acid media. The formation of the ternary complex has been made the basis for the development of a simple, rapid, sensitive and selective extractive‐photometric method for the determination of microamounts of vanadium(V). The method has been applied to the determination of vanadium in steels.
Copper(II), Nickel(II) and Cobalt(II) Complexes of Dibasic Tridentate Schiff Bases
Authors: Agrawal A.K. , Agrawal Sanjeev , Singh Nepal , Kansal B.D.
Published: June 2015

Complexes of Cu(II), Ni(II) and Co(II) with the Schiff bases derived from o‐aminobenzoic acid with salicylaldehyde and its 5‐chloro and 5‐bromo derivatives have been prepared. The 1:1 (metal‐ligand) stoichiometry of these complexes is shown by elemental analysis, gravimetric estimations and conductometric titrations while the structures of the complexes are proved by i.r. spectra and thermogravimetric analysis. The magnetic susceptibility and electronic spectra of Cu(II) complexes indicate the nonplanar binuclear structures while that of Ni(II) and Co(II) show their paramagnetic octahedral geometry. The molar conductance values in nitrobenzene indicate the nonelectrolytic behaviour of the complexes. The results show that the complexes of the type (Cu·L)2, Ni·L·3H2O and Co·L·3H2O are formed having solvent molecule in coordination with the metal ion. The monopyridine and monoammonia adducts of Cu(II) complexes were found to be monomeric.
Mössbauer Studies on Spin State of the Thermal Decomposition of Substituted Tris (2‐Pyridylimine) Iron (II) Thiocyanate
Authors: Wei Ho‐Hsiang , Hsiao Ching‐Sung
Published: June 2015

The spin states of iron (II) in FeL2(NCS)2 produced from the thermal decomposition of FeL8(NCS)2 (L=2‐py‐CR1=NR2, R1 or R2=H, Me(CH3), Ph) under nitrogen atmosphere are investigated by means of Mössbauer spectroscopy and magnetic measurements. It was found that the spin states of iron (II) in substitutited bis (2‐pyridylimine) iron (II) thiocyanate are included: intermediate‐spin (3T1, S=1), mixed‐spin of 5T2(S=2)+3T1 and spin incomplete transition of 5T2⇌3T1.
Polarography of Molybdenum (VI)—Gallic Acid Complexes in Perchlorate Media
Authors: El Inany G. , Zidan F. , El Shetary B.
Published: June 2015

Polarographic and spectrophotometric studies were carried out on Mo (VI)—gallic acid (G) complexes in aqueous solution of perchlorate media. It was found that the number of waves of Mo (VI) depends on gallic acid concentration as well as on the pH of solution. Only a single well‐defined irreversible wave is obtained at pH 8.0 for the reduction of Mo (VI) to Mo (III), proportional to Mo (VI) concentration in presence of 20 mM gallic acid with E1/2=−1.22 V vs SCE. The composition of the formed complexes depends on the pH of solution as revealed from spectrophotometric studies, a 1:1 Mo/G complex is formed at pH 3.0 and 1:2 complex at higher pH′s‐NMR study of the isolated 1:2 complex proves that the complexation occurs through—OH groups of gallic acid.
Effect of Solvents on the Spectra of Some N′‐2‐(Substituted Pyridyl)‐N‐Substituted‐Thioureas
Authors: Khurana O. P. , Tyagi J. S. , Taneja A. D.
Published: June 2015

Some N′‐2‐(substituted pyridyl)‐N‐substituted thiourea (in all 12‐substituted pyridyl thioureas) have been examined in ultraviolet region in a series of solvents covering a broad polarity range i. e. from benzene (Z, 54.0) to ethylene glycol (Z, 85.1). Transition energies and oscillator strengths have been calculated and transition energy (ET) has been plotted against Z‐values, a new‐empirical measurement of solvent polarity. A linear relationship was observed between the transition energy and Z‐value for pyridyl μ→μ* and thiocarbonyl μ→μ* transitions. The effect of substituent present in pyridyl group on λmax of a compound in the same solvent has been studied. Solvent sensitivites of these ligands have also been calculated.
Mechanistic Studies on Rhodium(III) Chelates Aquation of Cis‐Dinitrobisbiguaniderhodium(III) Nitrate
Authors: Chakravarty B. , Nandi B.
Published: June 2015

Aquation of cis‐dinitrobisbiguaniderhodium (III) nitrate was investigated conductometrically. Rates of the release of first and the second nitro groups were derived by a graphical method. For both the steps of aquation, the presence of electron accepting ‘nitro’ group, favours ‘bond formation’ by the incoming ligand in the transition stage and it occurs before the ‘bond rupture’ is complete. The loss of the second ‘nitro’ group most probably takes place along with a hydrogen ion from the ‘aquo’ ligand introduced in the first step of aquation with the resultant formation of the hydroxoaquobisbiguanide complex. Activation parameters were evaluated and are as follows: ΔH‡ are 18±1.2 and 18.6±1.1 k cals mole−1 and ΔS‡ are −15±2.7 and −19±2.3 e. u. respectively for the first and the second steps of aquation.
Kinetics and Mechanism of Oxidation of Adipic Acid by Ce(IV) Ion in Acidic Medium
Authors: Kansal B. D. , Pal Virendra , Singh N. , Maheshwari V. K.
Published: June 2015

Kinetic study of oxidation of adipic acid by Ce(IV) ion in aqueous solution of sulphuric acid shows that the reaction follows first order kinetics in both Ce(IV) and adipic acid and the over all reaction order ascertained is two. The specific rate constant increases with an increase in the concentration of adipic acid. Effects of hydrogen ion concentration, bisulphate ion and temperature have been studied in detail. Various kinetic parameters have been computed. The experimental findings are consistent with the mechanism involving rapid resersible formation of an activated complex between Ce(IV) and adipic acid followed by a rate determining step involving C‐C bond fission.
CNDO Calculation and Homo Repulsive Bond Order of Aromatics
Authors: Chen Cheng
Published: June 2015

The author et al. has recently developed a s‐p separation model CNDO‐MO method. Naphthalene, anthracene and their derivatives including CI and CH3 substituted functional groups have been selected for the MO calculation. The computational results of both the ionization potentials and the dipole moments are compatible with current experimental values. We here introduce a concept of the HOMO repulsive bond order (Pp(HOMO)µv). Then it is calculated in addition to repulsive bond order (Ppµv) developed previously in this work. The result shows that both HOMO eigenvalues and the Pp(HOMO)µv are the useful and powerful quantities for the predictions of reactivity and positional selectivity of the Diets Alder reaction.
Polymer‐Attached Thiazolium Salts‐Catalyzed Addition of Aldehydes to α, β‐Unsaturated Carbonyl Compounds
Authors: Chang Biau‐Hung , Chang Yueyeh L.
Published: June 2015

A homogeneous catalyst, 3‐benzyl‐5‐(2‐hydroxyethyl)‐4‐methyl‐1,3‐thiazolium chloride, for addition of aldehydes to activated double bond, was attached to 20% cross‐linked polystyrene‐divinylbenzene copolymer. The attached catalysts could be easily removed from the reaction mixture. Polymer‐attached thiazolium salts in the presence of triethylamine are active catalysts for addition of aromatic and aliphatic aldehydes to α,β‐unsaturated ketones to yield γ‐diketones.
Spectrophotometric Studies of Cerium(III) and Thorium(IV) Chelates of Diethylenetriaminepentaacetic Acid (DTPA)
Authors: Hseu Tong‐Ming , Peng Ling , Lin Zui‐Feng
Published: June 2015

The interaction between diethylenetriaminepentaacetic acid (DTPA or HsZ) and Ce(III) and Th(IV) ions has been investigated spectrophotometrically in aqueous solution at an ionic strength of 0.1 and for various temperatures. It has been found that the Ce(III)‐DTPA chelate (1:1) exhibited a characteristic absorption maximum at 297 nm, and the optimum pH range is between 3.4 to 4.4. The absorption of Ce(III)‐DTPA chelate is considerably diminished by adding small amounts of Th(IV) ions. This phenomenon was used to evaluate the formation constant of Th(IV)‐DTPA chelate (1:1). The formation constants and the thermodynamic properties characterizing the formation of the chelates have been calculated at 25°. The results are as follows:
On the Autocatalysis of Methane Pyrolysis
Authors: Tu Y.‐T. , Yeh Chuin‐Tih
Published: June 2015

Methane pyrolysis has been performed in a recycled flow system in the temperature range of 1103 to 1220 K to investigate the time profile of product distribution. Hydrogen, ethylene, and benzene are found to be the major products before the soot formation. Similar to the literature reports of studies in conventional flow systems, the rate of methane conversion is slow at the beginning of the decomposition and becomes fast after an incubation period. This increase in the decomposition rate after the incubation period is generally called autocatalysis. The proposed reason for this autocatalysis has been the catalytic effect of the secondary products, i.e., soots and carbon deposits. The present study showed that autocatalysis started before the accumulation of these products, and that decomposition of propylene and other minor but reactive products might be attributed to this autocatalysis effect.
Constituents of Ilex Species I. On the Leaves of Ilex Cornuta Lindl
Authors: Gau Shwu‐Wen , Chen Chien‐Chih , Chen Yuh‐Pan , Hsu Hong‐Yen
Published: June 2015

Phytochemical examination on the leaves of Ilex cornuta Lindl. (Aquifoliaceae) resulted in the isolation and identification of lupeol (I), 3β‐hydroxylup‐20(29)‐en‐30‐al (II), oleanolic acid (III), and β‐sitosterol‐β‐D‐glucoside (IV).
Constituents of Formosan Rhamnus Species Part II. Flavonoids from Rhamnus Formosan Matsum
Authors: Chung Mei‐Ing
Published: June 2015

Three crystalline compounds, rhamnetin(1), rhamnocitrin(4), and kaempferol(6) were isolated from the hot methanol extract of leaves of Rhamnus formosana Matsum.
Complexes of Oxamic Acid with La(III), Gd(III), Tb(III), Er(III), Tm(III) and Lu(III)
Authors: Zafiropoulos Th. F. , Perlepes S. P. , Galinos A. G.
Published: June 2015

The preparation, for the first time, of the deprotonated complexes of oxamic acid with La(III), Gd(III), Tb(III), Er(III), Tm(III) and Lu(III) is reported. Analytical results, conductometric measurements, magnetic moments and spectral data (IR and diffuse reflectance spectra) are discussed in terms of possible structural types. The oxamate anion acts as a N, O bidentate non‐bridging ligand.
Studies of C. I. Acid Red 186 and Metal Complexes with Uo++2, Ce3+ and Th6+ Ions
Authors: Abd‐El‐Kader A. K. , Abu‐El‐Wafa S. M. , Ezz‐El‐Arab M. A.
Published: June 2015

The electronic absorption spectra of C. I. Acid Red 186 are studied in solution of different pH. The pK values of the acid‐base equilibria set are determined and commented upon. The complexes of UO++2, Ce3+ and Th4+ ions are investigated by some spectroscopic techniques and potentiometric titration. The formation of 1:1, 1:2 and 1:2 complexes (M:L) with UO2++, Ce3+ and Th4+ respectively is confirmed and their conditional stability constants are determined. The solid complexes are prepared and analysed for their metal content, their ir spectra are disussed in comparison to that of the ligand to establish the bonding between the ligand and metal ions.
Preparation of Iron Carbonyls Supported on Organic Polymers
Authors: Chou Ta‐Shue , Feng Jung‐Jung
Published: June 2015

Triphenylphosphine ligand functionality could be readily introduced onto the 2% DVB and 12% DVB cross‐linked polystyrenes. Significant differences in reaction rates and loading capacities were observed in favor of the 2% DVB percentage cross‐linkage. The reaction of iron pentacarbonyl with polymeric ligand gave both monocoordination and biscoordination products. Product distribution analyses indicated that monocoordination was favored for both kind of polymeric ligands. Ratio of biscoordination to monocoordination was higher for the 2% DVB polystyrene ligand than for the 12% DVB polystyrene ligand indicating biscoordination proceeded more easily on the former.
Mössbauer Line Shape of Frozen Aqueous Solutions
Authors: Cheng H. S. , Hsu C. M.
Published: June 2015

Isomer shift of simple lines of the frozen mixture solutions of SnCl5H2O and K2SnF6 were linearly related to mole fraction and, therefore, to average ligand number, ñ. These spectra corresponded to Sn(H2O)6‐ñFñ(‐ ñ)+. Assuming that quadrupole splitting was also linearly related to ñ, Mössbauer spectra of Sn(ClO4)2 solutions containing different amount of HF could be resolved into components.
Mössbauer Spectroscopic Determination of Stability Constants of Fluorostannate(II) Complexes
Authors: Cheng H. S. , Hsu C. M. , Wei H. H.
Published: June 2015

Stability constants of fluorostannate(II) complexes were determined Mössbauer spectroscopically by rapid freezing technique. The observed isomer shift values suggested that these complexes were hydrogen bonded in perchloric acid solutions.
Mössbauer Spectroscopic Studies of Chlorostannate(II) Complexes in Frozen Aqueous Solutions
Authors: Cheng H. S. , Hsu C. M. , Shih L. L.
Published: June 2015

Mössbauer parameters of frozen aqueous solutions of Sn(ClO4)2 in 0.5 M HClO4 did not change with the concentration of NaClO4, so that it was used to keep the ionic strength at the desired level. When NaCl was added into Sn(ClO4)2 solutions, isomer shift did not change, but quadrupole splitting did. Therefore, stability constants were calculated from the quadrupole splitting data, which were in good agreement with the published values. The observed spectra could be resolved into components.
The Polarographic Behaviour of Some Arylidene Benzoic Hydrazide Derivatives and Substituent Effect
Authors: Hindawey A. M. , El‐Baradie H. Y. F. , Mohamed G. B.
Published: June 2015

The polarographic reduction of some arylidene derivatives of benzoic hydrazide are investigated at the DME. The polarograms in solutions of pH≤8 consist of a single wave corresponding to 4 electrons in acid media and 2 electrons in alkaline ones. The wave splite into two daughter waves in media of pH≥10, the more negative wave increases in height at the expense of ihe original one with rise of pH. The reduction waves are essentially diffusion controlled with one proton and two electrons in the rate determining step. The electrode reaction is discussed and the important kinetic parameters are determined.
Chemistry of o‐Benzoquinones and Masked o‐Benzoquinones. VI. Cycloaddition of 6, 9 Dipropyl‐1, 4‐Dioxaspiro[4.5] Deca‐6, 8‐Dien‐2, 10‐Dione with Cycloheptatriene
Authors: Hsu Y. H. , Kuo L. C. , Liao C. C.
Published: June 2015

Cycloaddition of masked o‐benzoquinone, 6,9‐dipropyl‐1, 4‐dioxaspiro[4.5]deca‐6, 8‐dien‐2,10‐dione, with cycloheptatriene afforded mainly [4π+2π] adducts which was transformed into 1, 4‐dipropyl‐5H‐benzocycloheptene by hydrolysis, photolysis and dehydrogenation consecutively. These reaction sequences represent a novel method for the synthesis of 5H‐benzocycloheptene from catechol via masked o‐benzoquinone.
Concentration Dependence of Mössbauer Parameters of SnCl−3 and SnBr−3 Complex Ions
Authors: Hsu C. M. , Cheng H. S.
Published: June 2015

Mössbauer parameters of frozen salt solutions could be correlated with apparent degree of dissociation, γ. KSnCl3 and KSnBr3 were dissolved in 0.5 M H2SO4, whereas NH4 SnCl3 was dissolved in 0.5 M HClO4. Mössbauer studies were made at different concentrations.
Mössbauer Spectroscopic Studies of K2SnCl6 and SnCl4·5H2O in Frozen Aqueous Solutions and in Ion Exchange Resins
Authors: Cheng H. S. , Hsu C. M. , Uen T. M. , Tseng P. K.
Published: June 2015

Concentration dependence of isomer shift of K2SnCl6 and tin(IV) chloride was studied. Tin was hydrolyzed in both cation and anion exchange resins after water washing. Two pairs of these two solutions showing the same isomer shift values, and therefore the same , were selected for further studies in HCl solutions and in anion exchange resins. The first pair was 0.04 M K2SnCl6 and tin(IV) chloride solutions (δ=0.00 mm/s; =0): Their δ‐[HCl] curves coincided each other. Tin was sorbed on anion exchange resin as pentachlorstannate(IV) at (HCl)≤6 N, and chiefly as hexachlorostannate(IV) at [HCl]≥7 N. The both complexes were sorbed when 6 N < [HCl] < 9 N. The δ‐[HCl] curves of the second pair, 0.4 M K2SnCl6 and 3 M tin(IV) chloride(δ =0.23 mm/s; =3), also coincided each other, and tin was sorbed as pentachlorostannate(IV) from K2SnCl6 solutions in the HCl concentration range studied (≥5 N).
Spectrophotometry Determination of Iron(II) Separated by Means of Adsorption of Its 3‐(2‐Pyridyl)‐5, 6‐Diphenyl‐1, 2, 4‐Triazine Complex with Tetraphenyl‐Borate on Microcrystalline Naphthalene
Authors: Lin Jenn‐Lin , Chang Lih‐Fen
Published: June 2015

A procedure is describe for the adsorption of ion‐associated complex of iron(II) 3‐(2‐pyridyl)‐5, 6‐diphenyl‐1, 2, 4‐triazine (abbreviated as PDT) cation with tetra phenylborate (TPB) anion on macrocrystalline naphthalene. A water‐insoluble ion‐associated complex formed with PDT and TPB is quantitatively adsorbed on micro‐crystalline naphthalene. The solid mixture containing the colored complex is dissolved in acetonitrile and the absorbance was measured at 553 nm. The other factors such as pH, amounts of reagents and naphthalene, shaking and standing times, diverse ions are studied. The method has been applied for the determination of iron in alloys and water samples.
Complexes of N‐(2 Hydroxy‐1‐Naphthalidene) Antharanilic Acid with Some Lanthanides
Authors: Abou Ali S. A. , Ali G. Y. , Osman M. M.
Published: June 2015

The complexes of N‐(2‐hydroxy‐1‐naphthalidene)anthranilic acid abbreviated (H2NA) with some trivalent rare earth elements (Pr, Nd, Sm, Gd, Dy, Er and Yb) were prepared. The complexes were characterized by chemical and thermal analysis, ir and conductimetric methods. Two types of ionic complexes; Ln(HNA)2OH·2H2O with Dy, Er and Yb, and Ln(HNA)2OH with Pr, Nd, Sm and Gd were isolated. Coordination of the ligand with metal‐ions occurs through the carboxy group and the nitrogen atom. The acid dissociation constants K1 and K2 of H2NA and the overall stability constants β1 and β2 of some lanthanide complexes in 75% (v/v) dioxan‐water solutions were determined by the potentiometric method.
Atomic Absorption Spectrophotometric Determination of Copper(II) after Adsorption of its Oxinate on Microcrystalline Naphthalene
Authors: Lin Jenn‐Lin , Chang Lih‐Fen
Published: June 2015

A New Atomic Absorption Spectrophotometric Procedure Has Been Developed For The Microdetermination Of Copper(Ii) As Its Oxinate By Its Adsorption On Micro‐Crystalline Naphthalene And Dissolution In 1 N Nitric Acid. Copper(Ii) Oxinate Is Quantitatively Adsorbed In The PH Range Of 3.2–10.1 And Trace Amounts Of Copper Can Be Determined. The Effect Of Variables Such As Reagent And Naphthalene, Shaking Time, Digestion Time, And Diverse Ions Are Studied. The Proposed Method Has Been Applied To The Determination Of Copper In Standard Reference Material (Zinc Alloy), And Metallic Zinc And Lead.
Constituents of the Peel of Citrus Depressa Hayata
Authors: Wu Tian‐Shung , Kuoh Chang‐Sheng , Wang Chao‐Hsiung , Tien Hsien‐Ju
Published: June 2015

Eleven known compounds; methyl‐3,4‐dihydroxycinnamate, pyrocatechuic acid, isoimperatorin, naringenin, umbelliferone, pyrocatechol, meranzin hydrate, neohesperidin, narirutin, friedelin, β‐sistosterol were isolated and characterized from the peel of Citrus depressa Hayata.
Synthesis and Reactions of Some 1‐Thiapyran‐4‐One Derivatives
Authors: El‐Barbary A. A. , Abdel‐Megeid F. M. E. , Gad F. A.
Published: June 2015

The preparation of some 3,5‐diarylidene‐1‐thipyran‐4‐one derivatives (Ia‐e) was described. Oxidation of Ia, b and Ie with hydrogen peroxide gave the corresponding dioxides (IIa‐c). Reaction of the 1‐thiapyran‐4‐one derivatives with bromine, Grignard reagents, and amines were studied. Structural assignments are supported by spectral (UV, IR, and 1HNMR) data.
The Structure of Suginal from the Wood of Juniperus Formosana Hayata
Authors: Kuo Yueh‐Hsiung , Chen Wen‐Chan , Wu Tseng‐Rong
Published: June 2015

The detailed investigation of the acetone extract from the wood of Juniperus formosana Hayata gave a new diterpene aldehyde which was elucidate as suginal on the basis of chemical and spectroscopic evidence.
On the Proper Normalization Constraint
Authors: Chang Tse‐Chiang
Published: June 2015

In the variational optimization of a trial function the proper functional to be varied is the Rayleigh quotient with the normalization constraint explicitly imposed. It will be shown that only under certain very rigorous conditions can one use the energy functional to replace the Rayleigh quotient and that, therefore, the normalization constraint is by no means a matter of no consequence.
Kinetics of the Ruthenium‐Catalyzed Hydrogenation of Acetic Acid to Ethanol
Authors: Shih Yen‐Shiang , Lee Chang‐Keng
Published: June 2015

The ruthanium‐catalyzed hydrogenation of acetic acid to ethanol was conducted at 140–230° under hydrogen pressure of 40.8–81.6 atm with a catalyst loading of 4 g/L. The best rate expression to fit the experimental results is

Kinetic data at 230° were obtained with an average error of 7%. It is concluded that the rate limiting step is the first addition of hydrogen to acetic acid to produce aldehyde and water as the intermediates. The activation energy is 12.7 kcal/mole.
The Stabilities of the o‐Carboxyphenylhydrazo‐Ethylacetoacetate OF Cu, Ni, Co, Zn, Mn and Cd Chelate Compounds in Different Solvents
Authors: El‐Shetary Basheir A. , Zahra Ahmed M. , Taha Atef A. , Ibrahim Aesha I.
Published: June 2015

The dissociation constants for o‐carboxyphenylhydrazoethylacetoacetate (o‐CPHEA) ligand, as well as the stability constants for the divalent metal complexes of Cu, (II), Ni (II), Co (II), Zn (II)and Cd (II) ions, have been calculated pH‐meterically in different solvents. The dissociation constans pK1=4.10 and pK2=10.55 of the insoluble organic ligand are calculated in aqueous medium. The effect of solvents, the relation between stabilities and both electronegativities and ionization potential are studied.
A Polarographic Study of ϵ‐Caprolactam Complexes of Uranium and Tellurium
Authors: Puri B.K. , Kumar Ashok , Rao A.L.J.
Published: June 2015

The polarographic behaviour of uranium and tellurium has been studied in the presence of increasing concentration of complex forming agent viz. ϵ‐caprolactam at pH 4.4 for U(VI) and at pH 10.0 for Te(IV) at μ=0.1 M KNO3. In both cases the waves have been found to be diffusion controlled and irreversible. The values of kinetic parameters (σπa and K°f,h) have been calculated as a function of the ligand concentration. Method is suitable for the quantitative determination of these metals individually and simultaneously with the effect of diverse ions.
The Structure of Taiwanin F from Taiwania Cryptomerioides Hayata
Authors: Kuo Yueh‐Hsiung , Chen Wen‐Chau , Lin Yau‐Tang
Published: June 2015

Reinvestigation of the nonvolatile fraction of the acetone extractive from the heartwood of Taiwania cryptomerioides Hayata afforded taiwanin F which was established as 11‐hydroxy‐7‐oxohinokiol on the basis of spectral data and its synthesis from hinokiol. In addition, six known compounds, taiwanin A, savinin, taiwanin C, hinokiol, taiwanin E and diphyllin were also isolated from the same fraction.
The Chemical Constituents of the Peel of Citrus Tankan Hayata
Authors: Cheng Yu‐Shia , Lee Chih‐Shone , Chou Chun‐Tzer , Chang Chi‐Feng
Published: June 2015

Seven kinds of flavones, β‐sitosterol, β‐sitosterol‐D‐glucoside, hesperidin, limonin, ferulic acid and succinic acid were isolated from the fruit peel of Citrus tankan Hayata.
Chelating Behaviour of Substituted 3‐4 Aryl‐Hydrazo‐Pentane‐2, 4‐Dione: Part VI. Potentiometric and Infrared Studies of the Ligands and Their Divalent Metal Complexes
Authors: El‐Shetary B. , El‐Inany G. A. , Issa Y. M. , Taha Atef A.
Published: June 2015

The dissociation constants of 3‐phenylhydrazo‐pentane‐2, 4‐dione and its o‐, m‐, p‐carboxy derivatives, and the stability constants of complexes of divalent metal ions with the o‐carboxy derivative are determined by pH‐metric method. The ir‐spectra of the ligands and some divalent metal complexes with the o‐derivative are discussed.
Preparation of Three Decadeoxyribonucleotides Containing an Uncommon or Modified Base
Authors: Chandrasecaran S. , Kan L. S.
Published: June 2015

Three decadeoxyribonucleotides (d‐C‐C‐A‐A‐I‐A‐T‐T‐G‐G, d‐C‐brC‐A‐A‐G‐A‐T‐T‐G‐G and d‐C‐C‐A‐A‐mG‐A‐T‐T‐G‐G) involving inosine (I), 5‐bromocytidine (brC) and 6‐O‐methylguanosine (mG) were chemically synthesized based on the phosphotriester approach in milligram quantities. The procedures of full protection reaction of these uncommon or modified bases are given in detail. The phosphotriester method was then employed to synthesize all the decamers. It seems the phosphotriester method is applicable to the synthesis of oligodeoxyribonucleotide with these three odd‐bases. However, slightly different procedures have to be used while deblocking the fully protected oligodeoxyribonucleotides depending upon the nature of the uncommon or modified base.
Determination of Elastic Moduli and Compliances of Viscoelastic Liquids Using the Dynamic Light Scattering Technique
Authors: Wang C. H.
Published: June 2015

Relations between the dynamic light scattering spectrum and the mechanical compliances and longitudinal stress moduli of viscoelastic liquids are provided. The result provides a basis for determination of mechanical relaxation spectra using the dynamic light scattering technique. The method of Computating the longitudinal modulus and the compliance spectra from the time correlation of density fluctuations of poly (propylene glycol), as determined by the photon correlation spectroscopy technique is illustrated.
Crystal Structure of [Co2(μ‐dmg)2(μ‐dmg H)(dmg H)(Pø3)] 1/2 dmg H2 · 1/2 CH3OH: A Crystal Containing Various Forms of dmg Ligand
Authors: Peng Shie‐Ming , Shauo Chung Dung , Wang Yu
Published: June 2015

The crystal structure of [Co2(μ‐dmg)2(μ‐dmg H)(dmg H)(Pø3)] · 1/2 dmg H2 · 1/2 CH3OH has been determined by single crystal X‐ray diffraction. The title complex crystallizes in triclinic space group P&1bar; with a=10.859(3), b=13.299(3), c=15.247(3)Å, α=98.52(2), β=99.26(2), γ=97.80(2)° and Z=2. The agreement indices are R(F)=0.062 and Rw(F)=0.085 for 5231 observations and 515 variables. Both cobalt atoms have an oxidation state of 3+ and are both six‐coordinated; one Co(III) atom is bonded to a phosphorous atom of triphenylphosphine, four nitrogen atoms of two planar ligands, dmg2− and dmgH−, and one oxygen atom of another dmg2− ligand. The other Co(III) atom is coordinated by four nitrogen atoms of two cis nonplanar ligands, dmg2−, dmgH−, and two oxygen atoms of the other dmg2− and dmgH− ligands. There are three N‐O bridged ligands namely two dmg2− and one dmgH− between two Co(III) atoms. A free molecule of dmgH2 and a molecule of CH3OH are also found in the crystal lattice. The structure interestingly demonstrates the possible various forms of dmg, not only on their charge but also in different conformations upon coordination.
Detection of the Sulfhydryl Group in Proteins by Raman Scattering Spectroscopic Method
Authors: Tu Anthony T.
Published: June 2015

Detection of the sulfhydryl group in proteins has previously been difficult. However, the group can be detected quite easily by Raman spectroscopy due to its distinct vibrational band at 2560‐2580 cm−1 region. This region is free of interference from other vibrational bands of protein. Detection of SH in tobacco mosaic virus coat protein and two sea snake neurotoxins was made to illustrate the application of Raman spectroscopy.
Chemical Synthesis of Oligodeoxyribonucleotides on the Polystyrene Polymer Support
Authors: Chandrasegaran Srinivasan , Kan Lou‐Sing
Published: June 2015

The synthesis of a decaeoxyribonucleotide, d‐CpCpApApTpTpTpTpGpG, as an example of DNA synthesis on a polystyrene polymer support using the phosphotriesters is described. The procedures for the recovery of the unreacted protected nucleoside phosphotriesters are also included. All operations and reactions were carried out in a 4 ml polypropylene Bio‐Rad Econo column fitted with a 3‐way teflon valve and a rubber septum. The average yield of each monomer addition is 96%. The decamer was obtained in high purity with an isolated yield of 56%. The purified decamer was characterized using a modified Maxam‐Gilbert procedure.
Solvent Effect on the Kinetic Study of the Alkaline Hydrolysis of Formamide in Acetone‐Water Mixtures
Authors: Salem S.M. , Sidahmed I.M.
Published: June 2015

The specific rate constants for the alkaline hydrolysis of formamide were determined in a series of acetone‐water mixtures ranging from 0.0% to 70% by weight of the organic solvent and at different temperature, 25°–50°. The rate was found to be larger in water. Addition of acetone appears to cause a change in the solvent structure as concluded from the variation of log k with either 1/D or log[H2O]. The reactivity of the reactants and the activated state seems to be affected differently by a change in the solvent structure. The magnitude of such effect should be considered separately on both the reactants and the activated state in order to account for the increase of the rate as the dielectric constant of the medium is increased.
A Study of the Sydnone Compounds: Bromination and Chlorination(III)
Authors: Tien Hsien‐Ju , Yeh Mou‐Yung , Huang Chun‐Yin
Published: June 2015

A convenient method for the bromination or chlorination of 4‐unsubstituted sydnone with NBS or NCS in DMF solution was carefully investigated. Tweleve bromo‐compounds (yield 74‐96%) and seven chloro‐compounds (yield 75‐93%) were obtained.
A‐Study of the Constituents of the Bark of Tsuga Chinensis Pritz. Var. Formosana (Hay.)
Authors: Fang Jim‐Min , Wu Shih‐Kwang , Cheng Yu‐Shia
Published: June 2015

The bark of the Taiwan hemlock was found to contain long‐chain alcohols, acids and esters, campesterol, β‐sitosterol, 13‐epimanool, larixol, dihydroconiferyl alcohol and the corresponding esters, p‐hydroxybenzoic acid, kaempferol, epiafzelechin, epicatechin and a novel compound of (3,5‐dihydroxy‐2‐methyl)phenyl 4′‐hydroxybenzoate.
Trace Analysis of Nickel by Extraction‐Atomic Absorption Spectrophotometry Determination of its Acenaphthenequinone Dioxime Complex in Molten Naphthalene
Authors: Lin Jenn‐Lin
Published: June 2015

A procedure is described for the trace analysis of nickel using the liquid‐liquid extraction of nickel acenaphthenequinone dioxime complex with molten naphthalene followed by solid‐liquid separation. Nickel complex cannot be extracted into any non‐aqueous organic solvents, but can be quantitatively extracted into molten naphthalene. It is very stable at high temperature and is dissolved in the mixed solvent (HNO3‐DMF). The absorbance of the solution was measured at 231.5 nm against a reagent blank. Beer's law is followed in the concentration range of 5–100 μg of nickel in 10 ml of the final solution. The sensitivity for 1% absorption is 0.155 μg/ml nickel. The relative standard deviation is 1.0% for ten replicate determinations of 60 μg of nickel. The interference of various ions has been studied and the method has been applied to the determination of nickel in aluminium alloys.
Comparative Study of Some Methods for the Determination of the Analgesic Anti‐Inflammatory Compound “IS4”: 4‐(Anisylideneamino) Antipyrine
Authors: Shukrallah I. Z. , Sakla A. B.
Published: June 2015

A comparative study of some quantitative methods has been undertaken. Chemical and colorimetric procedures have been developed for the determination of IS4: 4‐(anisylideneamino) antipyrine. The non‐aqueous titration and the nitritometric techniques were used. The formation of colored azo dye derivatives through diazotization and coupling with phenolic and amine reagents has been the basis of the colorimetric determination. Statistical analysis of the results has shown that a good agreement of the results has been found on applying the proposed methods to 4‐aminoantipyrine.
Preparation of σ‐ and π‐Benzyl Type Derivatives of Molybdenum
Authors: Lin See , Lin C. Y. , Wang H. Y.
Published: June 2015

The reaction of ‐LiM0(CO)2Cp with α‐chloromethylnaphthalene gives a yellow, crystalline σ‐benzyl type derivative of molybdenum (1). Irridation of (1) in n‐hexane gives a red π‐benzyl type derivative (2). Both complexes (1) and (2) are stable in air.
The Effect of Perchloric Acid on the Mössbauer Parameters of tin‐119 in Frozen Solutions
Authors: Cheng H. S. , Hsu C. M. , Chen M. Y. , Luh H.
Published: June 2015

The Mössbauer parameters of frozen solutions of 0.05 M Sn(H2O)(ClO4)2, Sn(H2O)3(ClO4)4, SnCl4·5H2O, SnBr4 and Na2SnBr6 [designated as Sn(H2O)N‐N, L(x‐N')+N, in which N≤N; N' = N = 6 for SnBr2−6, N′=4 with N=6 for Sn(H2O)2(ClO44 Sn(H2O)2Cl4 and Sn(H2O)2Br4 and N′=2 with N=3 for Sn(H2O)(ClO44)2] were found to be linearly related to the concentration (c) of perchloric acid. These facts were attributed to a change in activity of water (aw). At c=O, aw=1, the Mössbauer parameters corresponded to Sn(H2O)z+N, whereas at c=11.6 M (70%), they corresponded to the crystalline state of Sn(H2O)N‐N, L(z‐N)+N+. It was shown that even ClO−4 ion could coordinate to tin atom in perchloric acid. The degree of association at any given c could be estimated very easily through the relation . It was emphasized that the activity of water should be taken into account when equilibrium studies were carried out in perchloric acid solutions. Further corrections for perchlorate complex formation should be made, if a very weak ligand was added into metal perchlorate solutions.
Kinetics and Mechanism of Oxidation of 1‐Phenylsemicarbazide by Peroxydisulphate
Authors: Amira M. F. , Iskander M. F. , El—Shazly SH. A. , Abdel—Halim F. M.
Published: June 2015

Kinetics of oxidation of 1‐phenylsemicarbazide (PSC) by peroxydisulphate ion (PDS) have been carried out where by the pseudo first order condition was verified at large excess of PDS concentration. The rate of the reaction was followed spectrophotometrically, The stoichiometry was found to be 1:1 where 1‐phenylazoformamide is the oxidation product. The effect of acidity on the rate of oxidation was investigated for different temperatures. The parameters of activation ΔG*, ΔH* and ΔS* were computed for both hydrogen ion depedent and hydrogen ion independent reaction pathes. A free radical mechanism was proposed.