bluuebunny/crossref_metadata_2025 huggingface dataset:
Qualitative Analyses of Coins by Using a Si(Li) Detector and An Xrf‐Exciter System
Authors: Yang Huai‐Tung , Ting Chen‐Hanson
Published: June 2015

X‐ray fluorescence spectra of many coins are studied using a Si(Li) detector and an XRF‐exciter system. Some qualitative and semiquantitative analyses have been carried out. It is demonstrated that this method can be a very powerful means to study the archaeology of metal objects, especially the copper alloys, such as coins and bronze vessels.
Studies on the Components of Formosa Cirsium Species Part II Components of Cirsium Arisanense Kitam
Authors: Lin Chun‐Nan , Chang Cheng‐Hsiung , Wu Tian‐Shung
Published: June 2015

From the fresh leaves of Cirsium arisanense Kitam (Compositae), a flavone glycoside, pectolinarin (II) and an unsaturated dibasic acid, fumaric acid (III), were isolated.
Solvent and Substituent Effects on the Spectra of Some Substituted Thioureas
Authors: Kashyap B. C. , Banerji Samir K.
Published: June 2015

A study on the effect of a number of solvents, covering a broad polarity range i.e. from dioxane (D=2.20) to acetonitrile (D=38.0), has been made on the electronic transitions of N‐aryl, N′‐2‐(5‐halo‐pyridyl) thioureas (where aryl= ‐C2H5 or O‐CH3‐C6H5‐, and halo= ‐Cl, ‐Brand ‐I). Two intense absorption maxima in the regions 270‐285 nm (assigned for thiocarbonyl π‐π* transition) are exhibited by all the substituted thioureas studied. The excitation energies and oscillator strengths of these transitions have been calculated. A correlation between ‘ET’ and ‘Z’ (an empirical measure of solvent polarity) has been attempted. Solvent sensitivities of these compounds have also been calculated.

The effect of halo‐substituents, in the pyridine ring, on the spectra of these substituted thioureas has also been studied. It has been proposed that there is a delocalization of electrons between the pyridine ring and the thiourea unit of these compounds. This delocalization of electronic charge is affected by the substitution of the halo‐groups in the pyridine ring at para position to the thiourea unit which is reflected in the intensities and shifting of the absorption maxima.
Spectrophotometric Determination of Iridium (IV) with 3‐Nitroso‐4‐Hydroxy‐5, 6‐Benzocoumarin
Authors: Kohli Nitin , Kohli R. M. , Singh R. P.
Published: June 2015

Iridium(IV) gives a deep red complex with 3‐nitroso‐4‐hydroxy‐5,6‐benzo‐coumarin when heated on a boiling water‐bath for about 10 minutes. The complex is soluble in 50% aqueous acetone medium and exhibits maximum absorption at 520nm. Beer's law is obeyed up to 10.5 ppm of iridium at 520 nm. Molar absorptivity is 1.28×104 litre mole‐1 cm‐t and the sensitivity of the colour reaction is 0.015 μg Ir(IV)/cm2. The composition of the complex is 1:3 as determined by Job's and logarithmic methods. Common anions and cations do not interfere in the determination.
Electron Paramagnetic Resonance Study of Radical Pairs and Isolated Radicals Trapped in Irradiated Long‐Chain Hydrocarbons at Low Temperatures
Authors: Lin D. P. , Fan Kuo Wei , Yeh Si‐Jung , Chen Grace M.S.
Published: June 2015

The intrinsic characteristics of radical pairs produced in squalane and in cetane receiving high gamma‐dose are extensively studied with the EPR technique at temperatures from 77°K up to 150°K. The spectra of the paired radicals occur at g=4 with a very low transition probability in contrast to that of isolated radicals which appear at g=2 A well‐resolved hyperfine spectrum corresponding to the species (CH3CH2.CH2CH3) is observed in cetane. The isothermal decay rates of radical pairs in cetane below 100°K are significantly slow; however, the decay kinetics at 150°K is first order with rate constant=1.86 min−1. A relatively slower decay rate is obtained for isolated radicals suggesting that the decay mechanism of paired radicals is through geminate recombination. The relative inter‐radical distance in radical pairs is known from a decay curve as a function of temperature. The yields of radical pairs are low in both matrices, only few percents of those of isolated radicals. The formation mechanisms of paired radicals with direct radiolytic bond scission process are discussed in connection with the experimental observations.
Synthesis of N‐Substituted Maleimides as Potential Antineoplastic Sulfhydryl Agents
Authors: Liu Kang‐Chien , Jan Hon‐Ji
Published: June 2015

For a purpose of antineoplastic screening, a series of sulfhydryl‐binding agents, N‐substituted maleimides was prepared. These compounds were obtained by dehydration of the corresponding maleamic acids under suitable conditions in which the formation of maleisoimide by‐products was prevented, IR and UV spectra, as well as the elemental analyses confirmed the structural assignment of our products, A brief discussion on the preparation of N‐(2,4‐dinitrophenylamino)maleimide was also given.
Studies on Salicylate Complexes of Lanthanum
Authors: Koul M. L. , Kachroo P. L.
Published: June 2015

Stoichiometric determination of complexes of La (III) with some derivatives of salicylic acid by monovariation and Job's method of continuous variation have shown formation of 1:3 complex in each case. The dissociation constants of these complexes have been determined by conductometric and spectrophotometric methods.
3,4‐Bis(Trialkylsiloxy)Toluenes
Authors: Ho Chin‐Hsia
Published: June 2015

Three stable new compounds, 3,4‐Bis(trimethylsiloxy)toluene, 3,4‐Bis(triethylsiloxy)toluene and 3,4‐bis(tri‐n‐propylsiloxy)toluene have been synthesized and characterized by their analytical data, molecular weights, infrared and nuclear magnetic resonance spectra.
Physicochemical Studies on Cu(II)‐Ferron Complexes
Authors: Lin Zui‐Feng , Chiang Yueh‐Er , Chin Shain‐Hsin
Published: June 2015

Experiments were carried out at 25°C and μ of 0.1 M. Spectrophotometric and potentiometric methods gave the ionization constants of ferron, pK1=2.50±0.02 and pK2=7.12±0.02. Cu(II) and ferron form a sparingly soluble 1:1 complex, [Cu(H2O)2L]0 (L: ferronate ion) which in higher acidity media, protonates to give [Cu(H2O)2HL]+and in lower acidity media, ionizes to give [Cu(H2O)(OH)L]−. At pH 2.3, the 1:1 complex gives a minimum solubility and the intrinsic solubility was found to be 1.1×10‐4. The Job's continuous variation method and the molar ratio method gave a formation constant (–pK) for Cu2++Lz−⇌CuL, 10.8±0.1 in the pH range of 0.64 to 1.18 and in the pH range of 5.0 to 5.5 (optimum pH condition for formation of complex), the stoichiometry of the Cu(II)‐ferron chelate is essentially 1:2 (Cu:L) but with slight tendency to form 1:1 chelate if [L]/[Cu] is less than 2. The overall formation constant (–pK) was determined to be 20.0±0.3.
Spectrophotometric Studies of Nickel(II) Chelate of 2‐Picolylamine
Authors: Hseu Tong‐Ming , Tsai Yen‐Hsiang , Cheng Chi‐Wang
Published: June 2015

Nickel(II) chelate of 2–picolylamine has been studied spectrophotometrically in aqueous solution at 25°C and at an ionic strength of 0.3 M. The formation of pink color chelate was pH dependent, and the optimum pH range was between 7.0 to 8.5. Its mole ratio of ligand to nickel(II) ion was found to be 3 to 1 stoichiometry and the formation constant, logK, was determined as 13.31 ± 0.10. By using the wavelength 535 run, determination of trace amount of nickel(II) ion with the sensitivity of 5.28 τ/Cm2 was possible. Enthalpy and entropy changes characterizing the formation of the chelate have been calculated as follows: ΔG°=–8.15Kcal mole‐1, ΔH°=–9.65 Kcal mole‐1, ΔS°=28.5eu mole‐1.
Studies of Rare Earth Metal Complexes of Hydroxamic Acids
Authors: Liu Chuen‐Ying , Sun Peng‐Joung
Published: June 2015

A cyclic hydroxamic acid, 2–hydroxyquinoline–N–oxide and an aromatic hydroxamic acid, benzohydroxamic acid were obtained in the form of free acids. Their acid dissociation constants and a total of seventy of the formation constants for twenty five complexes formed by these two hydroxamic acids with rare earth metals and yttrium in aqueous solution have been determined by Bjerrum potentiometric titration technique.
The Neutral Part of the Bark of Pinus Luchuensis Mayer
Authors: Cheng Yu‐Shia , Chen Eric Hsiang‐Tsun , Fang George Jim‐Min
Published: June 2015

The neutral part of the acetone extract from the bark of Pinus luchuensis Mayer has been investigated and found to consist of alkanes (C22–C34) and triterpenes of serratene type. The triterpenes are 3β–methoxyserrat–14–en–21–one, serrat–14–en–3, 21–dione, 3β–hydroxyserrat–14–en–21–one, 3β–21α–dimethoxyserrat–l4–ene and 3β–methoxyserrat–14–en–21α–ol.
Studies on the Alkaloids of Formosan Lauraceous Plants XVIII Alkaloids of Neolitsea Buisanensis Yamamoto Et Kamikoti and Neolitsea Aurata (Hay.) Koidz
Authors: Lu Sheng‐Teh , Su Tsang‐Long , Wang Eng‐Chi
Published: June 2015

Two alkaloids, laurolitsine (V) and litsericine (VII), were isolated from the woods of Neolitsea buisanersis. Six alkaloids were isolated from the woods of Neolitsea aurata and five of them were laurolitsine (V), litsericine (VII), N–methyllitsericine (VIII), (+)–anonaine (IX), and (–)‐roemerine (X) (Table I).
Kinetics of Solid State Reaction Between HgCl2(S) and Na2CO3(S)
Authors: Bassi P. S. , Sharma Indu Bhushan , Gupta B. R.
Published: June 2015

The kinetics of reaction between HgCl2 (s) and Na2CO3(s) have been studied by capillary technique in the temperature range of 75–150°C. The reaction follows a logarithmic law. The energy of activation of the overall reaction is 9.16 k. cal/mole. The microscopic study shows that the product formed is amorphous.
A Spectrophotometric Study of Fe(III) Chelates of Some Hydroxy Coumarin Derivatives
Authors: Paruthi H. K. , Tyagi J. S. , Taneja A. D.
Published: June 2015

Chelates formation of Fe(III) with 7–hydroxy–4–methyl coumarin–6–carboxylic acid (HMCCH)2 and 8–amino–7–hydroxy–4–methyl coumarin (AHMCH) have been studied. It has been observed that Fe(III) forms 1:2 (metal:ligand) chelates with HMCCH2 and AHMCH. The stability constants of these chelates at different ionic strengths and the effect of temperature on the stability constants of these chelates have been studied. The thermodynamic parameters such as entropy change (ΔS), free energy of formation (ΔG) and enthalpy change (ΔH) have also been calculated. The effect of dielectric constant oh the stability constants of these chelates have been studied. Estimation of nanogram quantities of Fe(III) with these ligands and the effect of diverse ions have also been studied and the results have been compared with other methods used for estimation of Fe(III).
Studies on the Constituents of Formosan Gentianaceous Plants: Part 1. Constituents of Swertia Randaiensis Hayata
Authors: Wu Tian‐Shung , Tlen Hsieh‐Ju , Lin Chung‐Nan
Published: June 2015

Oleanolic acid and gentianine have been isolated from Swertia randaiensis Hayata.
Chemical Studies on the Orient Plant Drugs‐II Structure of Glycoside‐P1, A Steryl Glucoside of Panax Ginseng Rhizoma
Authors: Lin Tzong‐Dann , Lin Mei‐Chao
Published: June 2015

A new component of the steryl glucoside of Panax ginseng C.A. Meyer (Araliaceae) has been identified as sitosteryl–β–D–(6–O–fattyacyl)–glucopyranoside (1). Its gross structure, as a monoester of β–sitosteryl, campesteryl and stigmasteryl–β–D‐glucoside, was derived from a study of the products formed on methanolysis and on acid hydrolysis. The location of the fatty ester was established by comparison of the proton chemical shift for H2 C–6 in its tribenzoyl derivative with the chemical shifts for the corresponding protons in model benzoyl and acetyl derivation of sitosteryl–β–D–glucopyranoside.
Thermal Studies on Rare Earth Metal Ion Chelates of 8‐Hydroxyquinoline, 8‐Hydroxyquinaldine and Their Derivatives
Authors: Chang Tiao‐Hsu , Yang Tsong‐Jen , Yen Mei‐Wan
Published: June 2015

The thermal behaviors of chelates of oxine, 8‐hydroxyquinaldine and their derivatives (DCQ, 5, 7‐dichloro‐8‐hydroxyquinoline; DCQ', 5, 7‐dichloro‐8‐hydroxyquinaldine) in an air atmosphere have been studied. The order of heat stability of chelates, decreased with decreasing basicity of the ligand, i.e. oxine<DCQ<DCQ'. The presence of water or proton‐containing compounds in the chelates seemed to lower heat stabilities,
Kinetics of the Decomposition of Hydrogen Peroxide in the Presence of Aqua‐Pentacyanoferrate (II)
Authors: Girdhar K. K.
Published: June 2015

The decomposition of hydrogen peroxide has been studied in the presence of a large number of metal ions and their complexes1,2). Interest in radiation chemistry of aqueous solutions where hydrogen peroxide is one of the products and the use of acidic ferrous sulphate solutions as dosimeter in these studies has particularly stimulated the investigation on the kinetics of decomposition of hydrogen peroxide in the presence of Fe+2, Fe+3 and their complexes1,2). Ferrous sulphate solution can be used as a dosimeter under acidic conditions only, as at higher pH the hydrolysis of Fe+2 and Fe+3 interferes. Recent studies3‐6) have shown the possibility of using the aqueous solutions of ferro‐ and ferri‐cyanides over a range of pH as dosimeter. In the studies of ferrocyanide and ferricyanide catalysed decomposition of hydrogen peroxide7‐11), it is suggested that the catalytic properties of hexacyano ferrates are through their hydrated products. The present study aims at studying the interaction of aquapentacyanoferrate11) with hydrogen peroxide over a range of pH, concentration and temperature.
Temperature Effect on the Extraction of Uranyl and Thorium Nitrates by Tributylphosphate in Kerosene
Authors: Chen Chang‐Chyuan , Ting Gann
Published: June 2015

Temperature effect on the extraction of uranyl and thorium nitrates by tributyl‐phosphate (TBP) has been investigated at different nitric acid concentration (–0.17 ∼ 3 N), and solvent composition from 10°C to 60°C. Thermodynamic quantities for the extraction of uranyl nitrate and thorium nitrate were also estimated.
Photoaddition of Iodoform with Norbornene
Authors: Wang Ching‐Bore , Hsu Ying‐Gev , Lin Lung Ching
Published: June 2015

The reaction of norbornene with iodoform in the inert solvent under irradiation resulted in Kharasch type addition to give endo‐3‐iodo‐exo‐2‐diiodomethyl‐bicyclo[2.2.1]heptane, and a carbene addition to give tricyclic compound, anti‐3‐iodo‐exo‐tricyclo[3.2.1.02,4]octane. The structural assignments of these adducts are based on elemental analyses, ir, nmr, and mass spectral studies.
The Reaction of Indole Magnesium Bromide with Ketones I. The Reaction of Indole Magnesium Bromide with Cyclohexanone
Authors: Zee Sheng‐Hsu , Kuo Kuang‐Ming
Published: June 2015

Indole magnesium bromide, produced by reacting indole with n‐butyl magnesium bromide in ether, was reacted with cyclohexanone at ice or room temperature to yield 1‐(indol‐I‐yl)‐cyclohexanol (I), which is unstable and may be decomposed easily into indole and cyclohexanone in acidic condition. Indole magnesium bromide reacted with cyclohexanone in refluxing benzene or in anisole at 80°C, to form two products, 1‐(indol‐3‐yl)‐cyclohexanol (II) and 1‐(indol‐3‐yl)‐cyclohexene (III). (II) could be converted to (III) by heating (II) in phosphoric acid. Reaction of III with maleic anhydride gave a Diels‐Alder adduct (IV). Reaction of indole magnesium bromide with cyclohexanone in anisole at 130°C yielded (III) and a trimolecular condensation product of cyclohexanone (V).
Lanthanons(III) Complexes of Bifunctional Tridentate Schiff's Bases
Authors: Kapoor R. N. , Mehrotra S. K. , Rajpurohit V. S.
Published: June 2015

A systematic study of the reactions of isopropoxides of praseodymium, neodymium and samarium with bifunctional tridentate Schiff bases (acetylacetone‐O‐aminophenol and benzoylacetone‐O‐aminophenol) in equimolar ratios resulting in the formation of products with formula M(OPri) (SB), M(SB) (SBH) and M2(SB)3 (where SB is Schiff base anion, SBH is Schiff base and M is metal). The reactions have been found to be quite facile even at the room temperature as observed by immediate change of colour. The intensity of the colour of acetylacetone‐O‐aminophenol derivatives of rare earths decreased with the increasing stoichiometric ratio of the ligand i.e. from yellow to light yellow.
Synthesis of Some n‐Pyridyl and n‐Pyrimidyl Derivatives of Maleamic Acid
Authors: Liu Kang‐Chien , Chen Chia‐Fu
Published: June 2015

For a purpose of amination and hypocholesteremic evaluation, two N‐pyridyl and six N‐pyrimidyl derivatives of maleamic acid were prepared.
The Resolution of Amino Acids by Enzymes Part 1: Proteolytic Enzyme Bromelain for Hydrolysis of L‐Amino Acid Methyl Esters
Authors: Wong Chi‐Huey , Chen Shui‐Tien , Wang Kung‐Tsung
Published: June 2015

Preparation of optically pure L‐amino acids from the corresponding methyl esters of racemic mixtures by treatment with proteolytic enzyme, bromelain, was investigated. The reaction was carried out at pH 6.0‐6.5, 25°C in a mixture containing 0.1M substrate, 5mM β‐mercaptoethanol, 0.05M potassium phosphate and 3mg/ml of crude enzyme. The product was isolated by ion exchange chromatography and the purity of product was established by m.p., tlc, ir spectrum, elemental analysis and optical rotation measurement.
Lanthanon (III) Complexes of Bifunctional Tridentate and Tetradentate Schiff Bases
Authors: Kapoor R. N. , Rajpurohit V. S.
Published: June 2015

Reactions of isopropoxides of praseodymium, neodymium and samarium with bifunctional tridentate and tetradentate schiff bases (i.e. salicylidene‐O‐aminophenol and bis‐salicylaldehyde ethylenediamine) have been carried out in benzene in different stoichiometric ratios resulting in the formation of products with the formula M(OPri)(C11H9NO2), M(C13H9NO2)(C13H10NO2). M2(C13H9NO2) M(OPri)(C15H14N2O2), M(C16H14N2O2)(C16H15N2O2) and M2(C16H14N2O2)3 (where M stands for Pr, Nd and Sm). The products were found to be yellow to orange solids soluble in benzene and alcohol. The absorption spectra of these complexes were also recorded in methanol.
Effect of Configuration Interaction on the G Values for Trigonally Distorted Octahedral Low Spin d5 System
Authors: Lo Chien‐Cho
Published: June 2015

The g values for trigonally distorted octahedral low spin d5 system is calculated, including configuration interaction. An appropriate set of five‐electron wave functions is employed. The portion of the g values calculated here without including configuration interaction is identical with that of Griffith and Hill.
Thermodynamic Studies on the Complexation Reactions of Copper(II) Macrocyclic Tetramine Complexes with Monodentate Ligands: Part II. A Spectrophotometric Study on the Reactions of Meso‐5, 7, 7, 12, 14, 14‐Hexamethyl‐1, 4, 8, 11‐Tetraazacyclotetradecane‐Copper(II) (Blue) with Halide Ions
Authors: Liou Ming‐Chung , Chao Kuo‐Hua , Liang Bih‐Fong , Chung Chung‐Sun
Published: June 2015

The stability constants for the formation of [Cu(tet a)X]+(blue) from [Cu(tet a)]2+(blue) and X‐ (where X=Cl, Br, I) were determined by spectrophotometric method at 15°, 25° and 35°C. The corresponding ΔH° and ΔS° values were obtained from the variations of the stability constants between 15° and 35°C. For the same halide ion, the stability constant of [Cu(tet b)X]+ (blue) is larger than that of [Cu(tet a)X]+(blue).
Peptization of Thorium Hydroxide and Thorium Oxide Sols with Nitrate
Authors: Wen Tung‐Jen , Huang Theresa S. C. Chen
Published: June 2015

The peptization of thorium hydroxide and thorium oxide sol on the preparation of microsphere of nuclear fuels are studied. These sols are prepared mainly by dispersing hydrated thorium oxide in nitric acid. A main character of ThO2 sol is its NO3−/Th mole ratio. After peptization, the nitrate is presented as two forms; i. e., sorbed by particles of the sol and free in the aqueous solutions. The adsorbed NO3−/Th mole ratio depends on the average crystallite size of thorium oxide. In certain size range, the adsorbed NO3−/Th of ThO2 sol prepared from thorium oxalate is inversely proportional to the crystallite size. The different series of thorium oxide are made by different methods. In this paper the crystallite size is obtained from 33 to 84 A by changing calcination temperatures.
Preparation of Complexes of Nickel(II) Aryl Carboxylates with Morpholine and Piperidine
Authors: Kumar N. , Gandotra A. K.
Published: June 2015

Complexes of nickel(II) aryl carboxylates with a general formula Ni(RC6H4COO)2L2 where R=H, p‐CH3. p‐Cl, m‐ & p‐NO2; and L = morpholine and piperidine; have been prepared by the interaction of nickel(II) aryl carboxylates with a large excess of appropriate amine. Unlike parent anhydrous nickel(II) aryl carboxylates all these complexes are soluble in common organic solvents.
Complexes of Copper(II) Chloroacetates with Pyridine and Picoline N‐Oxides
Authors: Kumar N. , Suri A. K. , Kant Rama
Published: June 2015

1:1 Adducts of composition Cu(CH3‐xClxCOO)4L and 1:2 adducts of composition Cu(CH3‐xClxCOO)2L2 where x=1‐3 and L is pyridine N‐Oxide (PyNO), 2‐picoline N‐oxide (2‐PicNO) or 3‐picoline N‐oxide (3‐PicNO) have been isolated by the interaction of copper(II) chloroacetates with the appropriate N‐oxide ligands. The adducts are soluble in methanol.
The Stabilities and Thermodynamic Properties of Manganese(II) and Nickel(II) Chelates of Trans‐1,2‐Diaminocyclohexane‐N, N, N', N'‐Tetraacetic Acid
Authors: Hseu Tong‐Ming , Farng Li‐Pau , Siew Pi‐Yuen , Tsai Ing‐Ing
Published: June 2015

The interaction between trans‐1,2‐diaminocyclohexane‐N, N, N', N'‐tetraacetic acid (H1DCTA or H4Z) and Mn(II) and Ni(II) ions has been investigated. The formation constants of the hydrogen chelates (MHZ−), and of the normal chelates (MZ2−), have been measured at 20, 30 and 40°C, and an ionic strength of 0.10 (KNO3). The former was done by a titration technique and the latter by a mercury indicator electrode method. Enthalpy and entropy changes characterizing the formation of the normal chelates have been calculated at 25°C.
Synthesis of Less Stable Ketoximes—Regiospecific Substitution of Ketoximes
Authors: Yeh Ming Kuo
Published: June 2015

Dilithium derivatives of ketoximes react with alkyl halides to give α‐substituted oximes. The dilithium derivatives are proposed to involve chelate formation. And the product oximes are the less stable (Z‐) oximes.
A Convenient Regiospecific Syntheses of (E)‐1‐Alkanesulfonyl‐ and (E)‐1‐Arylsulfonyl‐2‐Phenylethenes
Authors: Liu Lilian Kao , Hong C. T.
Published: June 2015

(E)‐1‐Alkanesulfonyl‐ and (E)‐1‐arylsulfonyl‐2‐phenylethenes (styryl sulfones) were obtained from good to excellent yields by the base‐catalyzed elimination of the corresponding β‐chlorosulfones. The latter were obtained, respectively, by additions of the alkanesulfonyl‐ and the arylsulfonyl chlorides to styrene under the catalytic action of copper chlorides.
Complexes of Copper(II) Aryl Carboxylates with Picoline N‐Oxides
Authors: Kumar N. , Gandotra A. K. , Suri A. K. , Kant Rama
Published: June 2015

Copper(II) aryl carboxylates on interaction with 2‐picoline N‐Oxide (2‐picNO), 3‐picoline N‐Oxide (3‐picNO) and 4‐picoline N‐Oxide (4‐picNO) in acetone or ethyl acetate yield 1:1 adducts. These are regarded as binuclear bridged complexes of composition Cu2(RC6H4COO)2L2 where R is o‐, m‐, p‐CH2; o‐, m‐Cl: o‐NO2; m‐, p‐CH2O; and L is 2‐, 3‐, and 4‐picNO ligand. With 4‐picNO some 1:2 adducts have also been obtained.
Linear Correlation of the Basicity of Aromatic Compounds with Σσ+ Constants in the Hydrogen Chloride‐Aluminum Chloride System
Authors: Rei Min‐Hon
Published: June 2015

In an automatic hydrochlorinator, twenty‐four aromatic compounds including halogen and methoxy substituted compounds were complexed with hydrogen chloride and aluminum chloride. Relative basicities of these compounds to toluene were measured. Except those methoxy substituted compounds and few weakly basic compounds, the relative basicities of nineteen compounds were found to correlate linearly with the summation of σ+ constants. Thus, this technique provide a simple approach to the analysis of aromatic basicity.

While hexamethylbenzene was found to be 15 × 100 time more basic than was toluene, benzene was found to be only FIVE time less basic than was toluene. From the rate of chlorination, benzene was estimated to be 1300 time less basic than was toluene according to the literature report.

Moreover, the resultant complexes are composed of three types of structures. In the weakly basic region, a π‐complex is proposed. In the medium basic range, the σ‐complex is attributed to. the formation of a dimeric aluminum chloride‐hydrogen chloride complex. In the strongly basic region, the aromatic compound complexes with a monomeric aluminum chloride‐hydrogen chloride to form a stable σ‐complex.
Photolysis of Isoniazid
Authors: Chiang Hung‐Cheh , Lin Long‐Jin
Published: June 2015

The UV light irradiation of isoniazid (I) in methanol four products, isonicotinic acid (II), isonicotinamide (III), N, N′‐bis(isonicotinic acid)hydrazide (IV) and isonicotinaldehyde isonicotinyl hydrazone (V), in ethanol three products, (III), (IV) and acetaldehyde isonicotinyl hydrazone (VI) were isolated and identified. Also, the photoreaction mechanism of isoniazid in methanol and ethanol were discussed.
Some 4(1h) Pyridylidene Compounds II Synthesis and Structure of N,N‐Conjugated‐4‐Pyridine Compounds
Authors: Kuo Kung Tu
Published: June 2015

The reaction of 4‐methylpyridine and its methiodide with p‐N, N‐dimethylamino‐benzaldehyde gave 4‐p‐N, N‐dimethylaminostyrylpyridine (I) and 4‐p‐N, N‐dimethylaminostyrylpyridine methiodide (II), respectively, II was also prepared by methylation of I with methyl iodide in methanol. The pyridylidene structure of II, N‐benzyl‐4‐(p‐N, N‐dimethylaminophenyl) pyridinium chloride (IVa) and its methiodide (Va) was discussed in terms of UV, NMR and mass spectra.
Studies on the Photodimerization of Isoeugenol
Authors: Chiang Hung‐Cheh , Li Shyh‐Yuan
Published: June 2015

Under the irradiation of the ultraviolet light, Isoeugenol (I) undergoes dimerization in acetone to give diisoeugenol (II) and dehydrodiisoeugenol (III). The structures are determined by the comparison of the mixed m. p., I. R. spectra and T. L. C. with synthesized authentic samples. Also the photoreaction mechanism is discussed in detail. The reaction represents a new type and as an exception of photochemical process for the C=C double bond in conjugation with aromatic ring that generally dimerizes to produce cyclobutane type derivatives.
Liquid Chromatography of Adenine, Caffeine, Theobromine, Theophylline, Tannic Acid, Xanthine and its Application to Tea Analysis
Authors: Hsu Tong‐Jung , Liao Chi‐Chow , Chen Mei‐Yun
Published: June 2015

A polystyrenesulfonic acid resin in the hydrogen form is a useful stationary phase for chromatographic separation of adenine, caffeine, theobromine, theophylline, tannic acid, xanthine and tea components with aqueous ethanol as eluent. The results indicated that caffeine, theophylline, theobromine, adenine, xanthine and tannic acid could be separated on a column of Dowex‐50W‐X8(H)+ by elution with 25% ethanol as eluent.
Nitro, Nitrito and Nitrato Derivatives of Dicyclopentadienyl Thallium(III) Chloride and Bis Indenyl Thallium(III) Chloride
Authors: Hari S. C. , Arora R. S. , Bhalla M. S. , Multani R. K.
Published: June 2015

Six new complexes of thallium(III) of the formula (π‐D)2Tl(L) (where D= cyclopentadienyl or indenyl group and L=nitro, nitrito or nitrato group) have been prepared and characterised on the basis of I. R. studies and some thermal properties of these complexes.
Contribution of P‐O and P‐N Linkages in Phosphorylated Histone H1
Authors: Wang L. Y. , Fricke O. , Lin Y. C.
Published: June 2015

In studies of the phosphorylated proteins in Walker‐256 carcinosarcoma, it was established that the ratio of P‐N linkages to P‐O linkages on histone H1 varied between 0.6 to 1.0. Histone H1 was phosphorylated in vivo and isolated under all neutral conditions employing a dextran/polyethylene glycol two‐phase system and Bio‐Rex 70 chromatography.
Proton Magnetic Resonance Studies of Heterocyclic Aromatic Amine Adducts of Nickel(II) and Cobalt(II) Acetylacetonate
Authors: Wang Wen‐Jwu , Wei Ho‐Hsiang
Published: June 2015

The proton nmr isotropic shifts of pyridine type ligands coordinated to paramagnetic nickel(II) and cobalt(II) acetylacetonate are reported, and the mechanisms of unpaired electron spin delocalization in these complexes are discussed. It is found that a σ‐delocalization mechanism is in dominant, but the π‐contribution can not be rule out. The calculations of the geometric factor for Co(II) complexes are done. It is used in the ratio method to separate the contribution of pseudo‐contact shift from isotropic shift for Co(II) complexes. The effect of pseudoaromatic chelate ring on contact shift is not so large as previously reported.
The Natural Optical Activity of Tris(Ethylenediamine)Metal(II) Nitrates V. The Single Crystal Circular Dichroism Spectrum of Ni(en)3 (NO3 )2
Authors: Yang Mark Chin‐Lan , Palmer Richard Alan
Published: June 2015

The axial CD spectra of single crystal of Zn(en)3(NO3)2 doped with 1‐50% Ni(en)3(NO3)2 have been observed at temperatures from ambient to 5 K. The increase in R of the 3E[3T3g(F)] transition as the temperature decreases is consistent with the magnetic dipole allowed character of the parent octahedral transition. The electric and magnetic dipole forbidden transition to the 3T1g(F) octahedral level gives rise to a relatively weak axial CD band with an unusual temperature dependent splitting. This structure is attributed to electric quadrupole intensity, which is allowed for transitions to both the E and 3A2[3T1g(F)] levels in D3 symmetry.
The Mutual Resoluton of Dl‐ephedrine and N‐Benzyloxycarbonyl‐Dl‐Amino Acids
Authors: Wong Chi‐Huey , Wang Kung‐Tsung
Published: June 2015

D(‐)‐Ephedrine was prepared by resolving the racemate through its N‐benzyloxycarbonyl‐L‐phenylalanine salt in ether solution. The L(+)‐ephedrine in mother liquid was recovered and precipitated exclusivly with N ‐benzyloxycarbonyl‐L‐alanine in ethyl acetate. The amino acid derivatives were recovered from the salts by acid decomposition and the optically pure ephedrine was also recovered, which was again useful for the resolution of racemic amino acid derivatives synthesized chemically. Other amino acid derivatves are also tested for the mutual resolution.

Mutual resolution was also effected by dissolving DL‐ephedrine and N ‐benzyloxycarbonyl‐DL‐alanine in ethyl acetate to obtain the optically pure D(‐)‐ephedrine and N ‐benzyloxycarbonyl‐D‐alanine.
Liquid Chromatography of Benzoic Acid and Phthalic Acid on Ion‐Exchange Resin
Authors: Hsu Tong‐Jung , Liao Chi‐Chow , Chen Mei‐Yun
Published: June 2015

This is to report a study in which cation ion‐exchange resin serves as the stationary phase for liquid chromatography of benzoic acid and phthalic acid and aqueous ethanol acts as the mobile phase. No ion. exchange phenomenon is involved. It is rather a solvent action on the polymer matrix for the organic solutes. It was found that the elution volumes depend on the pKa values of the acids; the higher the pKa value the more the retention volume.
Studies of Thermal Transesterification of Phenylurethane by High Pressure Liquid Chromatograph
Authors: Young Yong Hwa , Lin Horng Min , Lin Ming Yuan
Published: June 2015

Thermal transesterification of phenylurethane with n‐octanol was carried out in DMSO. It was found that the reaction followed first‐order kinetics with an average rate constant of 8.630 × 10−5 sec −1at 140°C. High pressure liquid chromatograph technique was employed to analyze chemical species in the course of the reaction. The reaction obeyed Arrhenius equation closely between 133°C and 155°C with activation energy of 29.6 kcal/mole and entropy of activation of −8.2 cal/mole deg at 140°C. An intramolecular cyclic intermediate mechanism was proposed for this reaction.
Observation of Anti‐Stokes Resonance Raman Signals of Gaseous Bromine with 5145 Å Excitation
Authors: Hwang Dah‐Min , Chang Hua
Published: June 2015

The 5145 Å laser line was used to excite gaseous bromine in order to observe the resonance Raman effect. In the Stokes side, strong resonance fluorescence overwhelm, therefore the resonance Raman scattering could not be detected. However, in the anti‐Stokes side, four resonance Raman peaks were observed. The corresponding transitions are Δν= −1 to −4. The resonance Raman spectrum excited by the 4880 Å laser line was also presented for comparison.
Enzymatic Synthesis of Oligopeptide. Part II. Synthesis of Bis(N‐Protected Amino Acid) Hydrazides by Papain
Authors: Chou Shan‐Ho , Wong Chi‐Huey , Chen Shui‐Tien , Wang Kung‐Tsung
Published: June 2015

New hydrazide derivative identified as bis‐di‐N‐acylamino acid hydrazide was synthesized from N‐acylamino acid and hydrazine under papain catalysis. The reaction was carried out at pH 5.0, 38°C in a mixture containing 0.2M Z‐X‐OH+ or Boc‐X‐OH, 2% NH2NH2·H2O, 0.8% β‐mercaptoethanol, 0.1.% EDTA and 50 mg/ml of papain. The bis‐hydrazide can be used in peptide synthesis via oxidation.
Liquid Chromatography of Aspirin, Salicylic Acid and Acetic Acid on Cation Exchange Resin
Authors: Hsu Tong‐Jung , Liao Chi‐Chow , Chen Mei‐Yun
Published: June 2015

A 8% cross‐linked sulfonated polystyrene cation exchanger in the hydrogen or sodium form was used as stationary phase for the chromatography of aspirin, salicylic acid and acetic acid. The eluent is 0.02 M mineral acids or their sodium salts in aqueous ethanol. Phosphoric acid, nitric acid or sulfuric acid added in aqueous ethanol eluent made successful separation of aspirin, salicylic acid and acetic acid on hydrogen form cation exchanger.
Constituents of Panacis Japonici Rhizoma. VI The Structure of Chikusetsu‐Saponin II, IVC
Authors: Lin Tzong‐Dann , Shoji Junzo
Published: June 2015

Chikusetsusaponin II and IVc, the minorsaponins of Panacis japonici rhizoma (rhizome of Panax japonicum C.A. MEYER) have been isolated. The structure of these saponins were established as being oleanolic acid‐(3)‐[β‐D‐glucopyranosyl (1→6)]‐β‐D‐glucuronopyranoside and 20S‐protopanaxatriol‐6‐(O‐α‐L‐rhamnopyranosyl (1→2)‐β‐D‐glucopyranoside]‐20‐O‐β‐D‐glucopyranoside.

Chikusetsusaponin II is a new structure, while chikusetsusaponin IVc is identical with ginsenoside‐Re, isolated from P. ginseng C. A. MEYER.
Transferability of Electronic Interaction Energies Between Localized Orbitals
Authors: Shei Tsung‐Ching , Pan Kee‐Chuan
Published: June 2015

Localized molecular orbitals have been shown to be transferable among structurally‐related molecules. We further show that the electronic energies between localized orbitals are transferable and their magnitude can be estimated. A set of parameters of group interaction energies are established from the analysis of small molecules. Use of these parameters is demonstrated successfully for large molecules.
The Synthesis of 12‐Methyl‐1, 2, 3, 4, 6, 7, 12, 12B‐Octahydroindolo [2,3‐A]Quinolizine (1), 1‐Benzoyl‐1, 2, 3, 4, 6, 7, 12, 12B‐Octahydroindolo[2, 3‐A]Quinolizine (2), and 1‐Phenylcarbinol‐1, 2, 3, 4, 6, 7, 12, 12B‐Octahydroindolo[2, 3‐A]Quinolizine (3)
Authors: Hwang Der‐Yan , Chen Sing‐Sweng , Gu Jen‐Tau
Published: June 2015

12‐Methyl‐l, 2, 3, 4, 6, 7, 12, 12b‐octahydroindolo[2, 3‐a]quinolizine (1) is synthesized through a new route developed in our laboratory. The most important step in this synthesis is the condensation of I‐methyltryptophyl bromide (4) with 2‐piperidone (5) to give N ‐(2‐(1‐methylidol)‐3‐ylethyl)‐2‐piperidone (6) in good yield (70%). The synthesis of 1‐benzoyl‐1, 2, 3, 4, 6, 7, 12, 12b‐octahydroindolo(2, 3‐a]quinolizine (2) and 1‐phenylcarbinol‐1, 2, 3, 4, 6, 7, 12, 12b‐octahydroindolo[2, 3‐a]quinolizine (3) follow the method developed by Wenkert. But the yield of tetrahydropyridine 9 from partial hydrogenation of pyridinum bromide 8 with 10% palladium‐charcoal is 84% which is much higher than the best yield (40%) in the literature, since the phenyl group contribute additional stability.
Mössbauer Studies on Spin Crossover in Schiff Bases Complexes of Iron (III)
Authors: Wei Ho‐Hsiang , Li Ting‐Kaung
Published: June 2015

The Mössbauer spectra of the imidazole adducts of tetradentate Schiff bases complexes of Iron (III), (FeLIm2)+ have been measured. Based on the Mössbauer spectra and magnetic moments, the spin‐equilibrium of Low‐spin ⇌ high‐spin for [Fe(bzacen)(lm)2)B(ph)4 was observed.
Solvent Extraction Studies of Macrocyclic Tetramine Ligands
Authors: Luo Chuen‐Lu , Chen Chien‐Hsing , Chung Chung‐Sun
Published: June 2015

The distribution ratios of tet a tet b and cyclam in several solvent systems at 25°C as functions of hydrogen ion concentration were determined by spectrophotometric method. The protonation constants and the distribution constants or these macrocyclic ligands and their protonated species were obtained from the variations of the distribution ratios in the range of 5<‐log[H+]<13.
6β‐Acetoxy‐7 α‐Hydroxyroyleanone, A New Compound from Taiwania Cryptomerioides Hayata
Authors: Kuo Yueh‐Hsiung , Shih Jeng‐Shiung , Lin Yi‐Tsung , Lin Yau‐Tang
Published: June 2015

Two crystalline compounds from the bark of Taiwania cryptomerioides Hayata were isolated. One of them was identified as 6,7‐dehydroroyleanone and the other was shown to be a new derivative of royleanone having a structure of 6β‐acetoxy‐7α‐hydroxyroyleanone.
Mössbauer Studies of Bispyridine Adducts of Fe(II), 57Fe‐Doped Ni(II), Co(II) and 57Co‐Labelled Co(II) β‐Diketonates
Authors: Wei Ho‐Hsiang
Published: June 2015

The Mössbauer absorption and emission spectra of FeL2Py2, Fe‐doped (57Fe, M) (L)2Py2 and 57CoL2Py2 (where, L=acac, dbm and hfa, M=Co or Ni) are reported. It was found that the Mössbauer parameters, especially, quadrupole splittings of 57Fe in 57CoL2Py2 exception of 57Co(dbm)2PY2are quite similar to those of the corresponding (57Fe, Co)L2Py2. In addition, the Mössbauer spectra shown that the chemical states of 57Fe in the hosts of Fe(acac)2Py2, Co(acac)2Py2 and Ni(acac)2Py2 were not identical.
Two New Diterpens Phenols‐7α‐Methoxydeoxocryptojaponol and 7β‐Hydroxydeoxocryptojaponol
Authors: Kuo Yueh‐Hsiung , Lin Nan‐Horng , Lin Yau‐Tang
Published: June 2015

Six crystalline compounds, α‐cedrol, β‐sitosterol, cryptojaponol sugiol and two new diterpene phenols were isolated from the hexane extractive of wood of Juniperus formosana Hayata. Two new phenolic derivatives of deoxocryptojaponol were established as 7α‐methoxydeoxocryptojaponol and 7β‐hydroxydeoxocryptojaponol, respectively, by chemical and physical evidence.
Complexes of Cobalt(II), Nickel(II) and Copper(II) Chloroacetates with Quinoline N‐Oxide
Authors: Kumar N. , Kachroo P. L. , Gandotra A. K. , Kant Rama
Published: June 2015

Some 1:1 and 1:2 adducts of cobalt(II), nickel(II) and copper(II) chloroacetates with quinoline N ‐oxide have been isolated by the interaction of the appropriate metal chloroacetate with quinoline N ‐oxide (QuinNo). The complexes isolated are of 1:1 stoichiometry of formula (M(CH3‐xClxCOO)2QuinNO) (when M=Co(II), Ni(Il); X=l, 2 and 3 and when M=Cu(II), X=1 and 2) except copper(II) trichloroacetate which yields an adduct of 1:2 stoichiometry of formula[Cu(CCl3COO)2 (QuinNO)3]. The adducts isolated are soluble in common organic solvents.
Zirconium (IV), Thorium (IV) and Dioxouranium (VI) Complexes of Dibasic Tridentate Schiff Bases
Authors: Agarwal A. K. , Kumar Ravindra , Singh Nepal , Kansal B. D.
Published: June 2015

Dibasic tridentate Schiff bases obtained by the condensation of O ‐aminobenzoic acid with salicyldehyde and its 5‐chloro and 5‐bromo derivatives were synthesised and used to pracipitate Zr(IV), Th(IV) and UO2(VI) metals as complexes. 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 measurements by Gouy method show, these complexes to be monormeic and diamagnetic. The molar conductance values in nitrobenzene indicate the nonelectrolytic behaviour of the complexes. The results show that the complexes of the type Zr(OH)3L.H2O2 Th(OH)2 L.H2O and UO2L.H2O are formed having solvent molecule in co‐ordination with metal ion.
Constraint Variational Calculations on Excited States
Authors: Chang T. C.
Published: June 2015

The difficulties of the SCF and MCSCF calculations on excited states have been reviewed. Three constraint variational methods are then developed which can perform the SCF and MCSCF calculations on excited states in the scheme of the generalized Brillouin theorem method. The proper constraints and the ways to incorporate the constraints into the variational calculations on excited states have been studied and the comparison with other approaches have been accessed.
Effect of Deposition Rate on the Formation of Multimeric Species of Matrix Isolated Ethanol
Authors: Lin K. C. , Tai T. L. , Tsai M.C.
Published: June 2015

The effect of sample deposition rate on the spectral pattern of matrix‐isolated ethanol at 10°K in the hydroxyl stretching region was examined. It is shown that the spectral pattern changes greatly with sample deposition rate and the formation of various multimeric species of ethanol molecules can be conveniently controlled by varying the deposition rate at an appropriate M/A ratio instead of varying the M/A ratio.
Copper(II) Complexes of N, N′‐Bis‐βCarbamoylethyl) Ethylenediamine in Aqueous Solution
Authors: Wei Li‐Wen , Chao Min‐Shiun , Chung Chung‐Sun
Published: June 2015

The interactions of the ligand N, N ‐bis‐(β‐carbamoylethyl)‐ethylenediamine (BCEN) with copper (II) in aqueous solution have been investigated by potentiometric and spectrophotometric techniques. The two protonation constants of the ligand at 25° in 0.2 M NaNO3are 105‐51and 105‐44 The quantitative equilibrium studies of the stepwise reactions which precede the formation of CuBCEN2+ and the Cu‐O to Cu‐N bond rearrangements at the two amide sites are described in detail. Electronic spectra of the copper (II) chelates formed are measured and discussed.
Repulsive Bond Order and Four Center Type Reaction: Selectivity of Polycyclic Aromatics
Authors: Chen Cheng
Published: June 2015

In this paper, the all bond model ZDO‐MO method(1‐2) was extend to include the π‐system of twenty six polycyclic aromatics. The calculated ionization potential in most cases were found to be in good or satisfactory agreement with experimental values.

Population analysis was performed on several typical aromatic systems. Among the long range π‐bond orders, the 1,4 type repulsive bond order1) is the most important one. The reactive positions and the relative reactivity of Diets‐Alder reaction are predicted by the most negative repulsive bond order of the π‐system. The 1,2 and 1,4 π‐centers compete with each other in the ozonization reaction; the largest of them usually relates to the two most reactive positions of such reaction. The above mentioned facts support the idea of para‐conjugation suggested previously by the author3).
The Neutral Part of the Bark of Pinus Taiwanensis Hayata
Authors: Cheng Yu‐Shia , Chao Yah‐Lih
Published: June 2015

The neutral part of the acetone extract from the bark of Pinus taiwanensis Hayata has been Investigated and found to consist of alkanes (C14‐C33), longifolene, aliphatic esters (C42, C44, C49), aliphatic alcohols (C24, C26), 3β‐21α‐dimethoxyserrat‐14‐enc, 3β‐methoxyserrat‐14‐en‐21‐one, β‐sitosterol, 3β‐methoxyserrat‐14‐en‐21ã‐ol and 3β‐hydroxyserrat‐14‐en‐21‐one.
Mössbauer Studies of Bispyridine Adducts of Fe(II), 57Fe‐Doped Ni(II), Co(II) and 57Co‐Labelled Co(II) β‐Diketonates
Authors: Wei Ho‐Hsiang
Published: June 2015

The Mössbauer absorption and emission spectra of FeL2PY2 Fe‐doped (57Fe2M) (L)2Py2 and 57CoL2Py2 (where, L=acac, dbm and hfa, M=Co or Ni) are reported. It was found that the Mössbauer parameters, especially, quadrupole splittings of 57Fe in 57CoL2Py2 exception of 57Co(dbm)2Py2are quite similar to those of the corresponding (57Fe, Co)L2Py2. In addition, the Mössbauer spectra shown that the chemical states of 57Fe in the hosts of Fe(acac)2PY2, Co(acac)2Py2 and Ni(acac)2Py2 were not identical.
Synthesis of Optically Active l ‐Menthol Part II. Isolation of dl ‐Menthol from the Mixture of dl ‐Menthol Isomers
Authors: Chang Teh‐Chou
Published: June 2015

The mixture of dl ‐menthyl chloroacetaee isomers and the mixture of dl ‐menthyl cyanoacetate isomers were prepared by the esterification of the mixture of dl ‐menthol with chloroacetic acid and cyanoacetic acid, respectively. In these mixtures the dl ‐menthyl chloroacetate m. p. 23–24° and the dl ‐menthyl cyanoacetate m. p. 63–63.5° are crystal form, the other isomers, such as dl ‐isomenthyl cyanoacetate b.p. 136–138°/3mmHg are liquid form. The crystal form ester waa isolatded from liquid form ester by cooling crystallization, and then dl ‐menthol m. p. 32–33° was obtained by hydrolysis. The isolation effect has intimately relation to the dl ‐menthol content in raw material, the more dl ‐menthol content, the more yield and purity of crystal form ester, therefore, after hydrolysis, the obtained dl ‐menthol was excellent in purity.
Two New Diterpens Phenols‐7α‐Methoxydeoxocryptojaponol and 7β‐Hydroxydeoxocryptojaponol
Authors: Kuo Yueh‐Hsiung , Lin Nan‐Horng , Lin Yau‐Tang
Published: June 2015

Six crystalline compounds, α‐cedrol, β‐sitosterol, cryptojaponol sugiol and two new diterpene phenols were isolated from the hexane extractive of wood of Juniperus formosana Hayata. Two new phenolic derivatives of deoxocryptojaponoi were established as 7α‐methoxydeoxocryptojaponol and 7β‐hydroxydeoxocryptojaponol, respectively, by chemical and physical evidence.
Complexes of Cobalt(II), Nickel(II) and Copper(II) Chloroacetates with Quinoline N‐Oxide
Authors: Kumar N. , Kachroo P. L. , Gandotra A. K. , Kant Rama
Published: June 2015

Some 1:1 and 1:2 adducts of cobalt(II), nickel(II) and copper(II) chloroacetates with quinoline N ‐oxide have been isolated by the interaction of the appropriate metal chloroacetate with quinoline N ‐oxide (QuinNo). The complexes isolated are of 1:1 stoichiometry of formula [M(CH3_xClxCOO)2QuinNO] (when M=Co(II), Ni(II); X=1,2 and 3 and when M=Cu(II), X=l and 2) except copper(II) trichloroacetate which yields an adduct of 1:2 stoichiometry of formula[Cu(CCI3COO)2(QuinNO)2]. The adducts isolated are soluble in common organic solvents.
Zirconium (IV), Thorium (IV) and Dioxouranium (VI) Complexes of Dibasic Tridentate Schiff Bases
Authors: Agarwal A. K. , Kumar Ravindra , Singh Nepal , Kansal B.D.
Published: June 2015

Dibasic tridentate Schiff bases obtained by the condensation of O ‐aminobenzoic acid with salicyldehyde and its 5‐chloro and 5‐bromo derivatives were synthesised and used to pracipitate Zr(IV), Th(IV) and UO2(VI) metals as complexes. 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 measurements by Gouy method show, these complexes to be monormeic and diamagnetic. The molar conductance values in nitrobenzene indicate the nonelectrolytic behaviour of the complexes. The results show that the complexes of the type Zr(OH)2L.H2O, Th(OH)2L.H2O and UO2L.H2O are formed having solvent molecule in co‐ordination with metal ion.
Effect of Crack Temperature on the Pyrolysis of Ethane in Shock Tubes
Authors: Lee Wei‐Min , Yeh Chuin‐Tih
Published: June 2015

Accepting a previously proposed mechanism of ethane pyrolysis in shock tubes, experimental product distributions observed by Burcat et al. have been used, through computer simulation technique, to measure rate constants of following reactions in the temperature range 1206–1386°K.

Obtained k2values are substantially higher than the extrapolation from an Arrhenius equation reported for the same rate constant at low temperatures. Rate constant k2 is found decreasing with the system temperature at 6.3 atm of argon.