bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polarographic Studies of Dioxo‐Complexes of Germanium. I. The Ge(IV)‐Pyrocatechol‐Sulphonphthalein System
Authors: Pan Kuan , Lin Zui‐Feng 
Published: June 2015

AbstractPyrocatechol‐sulphonphthalein (abbreviated to PV) and its germanium complex were polarographically studied in an acetic acid‐acetate buffer at various pH's. A well‐defined reduction wave for PV with E ranging from —0.46 to —0.73 volt (S.C.E.) was observed in the pH region 3.2—7.0 at 25°C. This wave corresponds to a one‐electron reduction which is nearly revrsible. By following the ia values of PV at varying mole ratios of Ge(IV) to PV, the composition of the complex was deemed to consist of Ge(PV)2 and the instability constants were found to be (3.1±0.4)×10−8 at pH 5.0, (1.7±0.3)×10−8 at pH 6.1 and (1.9±0.4) × 10−8 at pH 6:5, respectively. A mthod for the computation of the instability constant of complex was proposed.
Polarographic Studies of Dipicrylamine. IV. Polarographic and Amperometric Determinations of Potassium with Sodium Dipicrylaminate
Authors: Lin Zui‐Feng 
Published: June 2015

AbstractPolarographic and amperometric methods for the determination of potassium by using sodium dipicrylaminate as the precipitating agent were investigated. Several methods for the location of the end point in the amperometric titration and the method for the calculation of the original concentration of potassium present in the test solution were discussed. In the amperometric titration, the sample solution was presaturated with potassium dipicrylaminate. A 0. 1 F sodium hydroxide solution was used as the supporting electolyte. The constant potential applied was —1.8 volt vs. a Hg‐pool electrode and the temperature was 0—0.3°C. Advantages and disadvantages of the methods were discussed. The solubility of potassium dipicrylaminate and the solubility product of dipicrylamine at various temperatures were determined spectrophotometrically. A special type of filter bar used in the solubility and solubility product determinations was described.
Comparative Studies of the Physico‐Chemical Properties of Native Rice Starch and Ponlai Rice Starch
Authors: Liau Yun‐Hau 
Published: June 2015

AbstractSome differences in physico‐chemical properties between the starch granules of Native Rice and Ponlai Rice have been found; The protein content and amylose content of Native Rice starch are higher than that of Ponlai Rice. They exhibit different types of gelatinization curves. The effect of protein distribution and that of amylose content on the physical properties of rice starch granules has been discussed.
The Chemistry of 8‐Mercaptoquinoline and its Derivatives. I. Synthesis of 8‐Mercaptcoquinoline
Authors: Lee H. S. 
Published: June 2015

AbstractAn improvement has been made in Edinger's method of preparing 8‐mercaptoquinoline. A new method of synthesizing the same compound, which consists of the reduction of quinoline‐8‐sulfonyl chloride, has been developed. It has been found that the S‐benzoyl derivative of 8‐mercaptoquinoline readily undergoes acoholysis.
γ‐Ray Induced Emulsion Polymerization of Vinyl Chloride
Authors: Wang Ung‐Ping 
Published: June 2015

AbstractEmulsion polymerization of vinyl chloride induced by γ‐ray irradiation has been studied. The effects of irradiation time, of emulsifier concentration, of vinyl chloride concentration and of the dose rate have been investigated and discussed. The initial reaction rate (Rp) and the degree of polymerization (P) were recognized to be proportional to the exponential powers of the value of the emulsifier concentration (Cs) as represented in the following formulae in which the exponents were found to be different from those given by Smith and Ewart.magnified imageThe value of Rp was greatly effected by the dose rate (D) and it was also found to be proportional to the exponential powers of D as shown in the following formula.magnified image
The Chemistry of 8‐Mercaptoquinoline and its Derivatives. II. Kinetics of the Alcoholysis of S‐Benzoyl‐8‐Mercaptoquinoline
Authors: Lee H. S. 
Published: June 2015

AbstractThe Kinetics of the alcoholysis of S‐benzoyl‐8‐mercaptoquinoline has been investigated by using spectrophotometric method.
Enrichment of Chromium‐51 by Szilard‐Chalmers Process
Authors: Tsai Chung‐Hsiung , Yeh Si Jung 
Published: June 2015

AbstractEnrichment of chromium‐51 by Szilard‐Chalmers process was studied, using potassium and ammonium chromate as target materials. Separation of enriched phase from the target was carried out by ion exchange method. Enrichment factor as high as 3,000 was attained for a potassium chromate target. When ammonium chromate was used as the target, the enrichment factor was much lower, amouting only to 150.
Spectrophotometric Studies of Dioxo‐Complexes of Quadrivalent Metals. I. Complexes of Zirconium and Hafnium with Pyrogallolsulfonephthalein
Authors: Pan Kuan , Lin Zui‐Feng , Lin Sheng‐Hsien , Wu Yu‐Lin , Chen Eng‐Ming 
Published: June 2015

AbstractPyrogallolsulfonephthalein and its complexes with zirconium and hafnium were spectrophotometrically studied in HClO4 and NaClO4 solutions of various pH's. An absorption maximum at 472 mμ has been found for pyrogallolsulfonephthalein at pH 1.0 and 1.5. It shifts to 518 and 520mμ in the presence of zirconium at pH 1.0 and hafnium at pH 1.5, respectively. The mole ratios of both metals to the dye have been found to be 1:1, and the apparent instability constants of the complexes are estimated as 1.34×10−5 for the former and 7.06×10−6 for the latter.
Cathodic Action of the Metal Complexes at the Dropping Mercury Electrode. VIII. Uranyl‐Glycinate Complex
Authors: Lai Tsai‐Teh , Lin Han‐Ton , Hsieh Ching‐Chiang 
Published: June 2015

AbstractThe formation of complex between uranyl ion and glycine was investigated by the polarographic method. A reversible and diffusion controlled reduction waves were observed over the pH range 1.7 to 5.0 when the glycinate concentration was 0.049M to 0.393M. The effect of pH and the concentration of chelating agent on the half‐wave potential has been determined. The chelate species and the electrode reactions have been established.
Infrared Absorption Spectra of Halogenoflavonoids. I. 8‐Halogenoflavonoids.
Authors: Lin Chi‐Hsiung , Su Jen‐Tsu , Chen Fa‐Ching 
Published: June 2015

AbstractInfrared absorption spectra of eleven 8‐halogenoflavonoids, flavanone, and 2′‐hydroxychalcone in the region 3,500–3,650cm−1 are observed with an Infracord Spectrophotometer in solid state. Absorption bands in the regions 3,500–1,400 cm−1 and 1,000–650 cm−1 are discussed.
Infrared Absorption Spectra of Halogenoflavonoids. III. 6‐Halogenoflavonoids
Authors: Lin Chi‐Hsiung , Su Jen‐Tsu , Chen Fa‐Ching 
Published: June 2015

AbstractInfrared absorption spectra of nineteen 6‐halogeno‐flavonoids in KBr disks are observed with an INFRACORD Spectrophotometer. Absorption bands in the regions 350C‐1400 cm−1 and 1000–650 cm−1 are discussed.
Infrared Absorption Spectra of Halogenoflavonoids. IV. Absorption Bands between 1400 cm−1 and 1000 cm−1
Authors: Lin Chi‐Hsiung 
Published: June 2015

AbstractThrough the comparison of spectra of fourty‐nine halogeno‐flavonoids, the origin of the main absorption bands between 1400 cm−1 and 1000 cm−1 is investigated. In addition to various C‐H in‐plane deformation bands, ten kinds of vibrations are tentatively assigned by way of correlating the spectra and structures of these substances.
Determination of Thoria Contents in Taiwan Monazite Sand and its Associated Minerals by Gamma Scintillation Spectrometry
Authors: Hstng Yun‐Shu , Chou Jing‐Liang 
Published: June 2015

AbstractA rapid method for the determination of thoria content in Taiwan monazite sand and its associated minerals, zircon, and ilmenite, is presented. The method is gamma scintillation spectrometric, taking the area under the composite photopeak of Ra‐224 (0.241Mev) and Pb‐212 (0.239Mev) as a measure of the thoria content. It is applicable to minerals with thoria content ranging from 10% to 0.01%. The relative standard deviation is 3%. A determination can be made within one hour directly on the sample.
Preparation of Iodine‐131‐Labelled Rose‐Bengal by Radioactive Exchange Method
Authors: Chen Teng‐Yueh , Yeh Si‐Jung 
Published: June 2015

AbstractLabelling of rose bengal with iodine‐131 was studied by using carrier‐free NaI‐131 produced at the National Tsing Hua University. The effects of pH and hydrogen peroxide on the radioactive exchange reaction were investigated. It was observed that as high as 88% of iodine‐131 was exchanged under the optimum conditions found in the present study. The purity of the I‐131 labelled rose bengal obtained by the exchange method was examined by paper chromatography, and was found to be satisfactory.
Reaction of Salicylic Acid with N‐Bromosuccinimide
Authors: Chen Shu‐Min , Yeh Ping‐Yuan 
Published: June 2015

AbstractThe reaction of equimolar amounts of NBS with salicylic acid in carbon tetrachloride was found to give tribromophenol, 4‐bromo‐ and 4,6‐(not 4,5)‐dibromo‐salicylic acids, while the same reaction carried out in dioxane yielded only tribromophenol and 4‐bromosalicylic acid and addition of pyridine into the reaction mixture (in dioxane) decreased the yields of the products. The fact that no 4,6‐dibromosalicylic acid could be produced in a dioxane medium is a strong evidence showing that the bromination in dioxane takes place through dioxane dibromide as the intermediate.
Preparation of Carrier‐Free Sodium‐24 by 24Mg (n,p) 24Na and 27Al (n, α) 24Na Reactions
Authors: Pan Kee‐Chuan , Chen Yi‐Der , Hong Hwei‐Kwan , Chang Chau‐Ting 
Published: June 2015

AbstractCarrier‐free sodium‐24 was prepared by bombardment of magnesium carbonate and aluminum foil with fast neutrons produced by the Tsing Hua Open Pool Reactor. The induced nuclear reactions were 24Mg (n,p) 24Na and 27AI (n,α 24Na respectively. The separation of the isotope was carried out by leaching, precipitation, solvent extraction and ion exchange. For each separation method used, the chemical yield and decontamination factor were determined and compared. It was found that ion exchange column operation was the most satisfactory method among all.
Extraction of Itaconic Acid from Fermentation Liquor of Molasses by Ion Exchange Method
Authors: Tsao June C. T. , Huang Ting‐Chia , Wang Chen‐Ping , Lin Kan 
Published: June 2015

AbstractThe extraction of itaconic acid from fermentation liquor by ion exchange method has been realized. Best results were obtained by first passing the fermentation liquor (diluted 3 times by water) through a column of cation exchange resin, Amberlite IR‐120, then through a column of strong basic anion exchange resin, Amberlite ira‐401, and eluting the itaconic acid out by 3N NaOH. The elution was complete when the volume of elutriant reached one‐half of the volume of the influent, in so far as the part already adsorbed on the resin is concerned. This brought the concentration of itaconic acid to two fold in a single run, and resulted in the decolorization at the same time.It was found that Amberlite IR‐45 (OH) can also be used to extract the acid 100% complete, but the column used should be twice as long, and the volume of the 3N NaOH elutriant should be increased three times.On account of the complicated nature of the molasses, the adsorption of the acid on the resins was only 57–66%complete. The improvement of the extraction by using methods such as selective coprecipitation prior to the extraction is under way.
Stereospecific Polymerization of Propylene with Natta Catalyst under Ordinary Pressure
Authors: Chia Kuei‐Shih , Wang Ung‐Ping 
Published: June 2015

AbstractThe stereospecific polymerization of propylene with Natta catalyst under ordinary pressure has been investigated and discussed. Propylene of 99.5% purity was polymerized with a metal‐organic complex catalyst, formed from A1(C2h5)3 and TiCl3, giving a white or greyish stereopolymer which contained ca. 70% isotactic polypropylene. The optimum conditions of polymerization were as follows: The mole‐ratio of Al(C2H3/TiCl3 was 8–15; the polymerization‐temperature was 70°C, and the concentration of TiCl3 was 0.6–0.8g per 120ml of n‐heptane. The maximum polymerization rate reached the value of 6g C3H6/hr./g TiCl3 and the apparent activation energy as calculated from an Arrheniusplotting line, was 12.1 kcal/mole.
Spectrophotometric Studies of Dioxo‐Complexes of Quadrivalent Metals III. The Ge(IV)—Gallein Chelate
Authors: Pan Kuan , Lin Cheng‐Yu , Fu Yi‐Chang 
Published: June 2015

AbstractThe chelate compound of germanium with gallein was spectrophotometrically studied in 0.18% dioxane solution. It was found that germanium and gallein formed a stable soluble complex in an acetate buffer of pH 5∼6. The ratio of germanium to gallein was estimated to be 1:2 by Job's continuous variations method. The instability constant of the chelate at 25°C was calculated as (6.13±0.10)×10−9at pH 5.56 and (4.24±0.10)×10−9 at pH 6.15, respectively.
Determination of Soil Potassium by Nondestructrive Activation Analysis
Authors: Ke Chiung‐Huei , Lin Ching‐Yü , Cheng Hwa‐Sheng 
Published: June 2015

AbstractThe method of Winchester(2) for the determination of potassium by nondestructive activation analysis has been applied to the determination of soil potassium. The experiments with seven soil samples of known potassium content gave good results. However, large discrepencies that existed between the nondestructive method and the flame photometry were shown by another set of twelve samples to be due to the statistical error in the activity measurements.
Some Bis(trimethylsiloxy)‐Compounds
Authors: Liu Sheng‐Lieh , Yahg Mei‐Fei 
Published: June 2015

AbstractFour compounds of bis(trimethylsiloxy)‐ether type, including 1,4‐bis(trimethylsiloxymethyl)‐cyclohexane, 1,4‐bis(trimethylsiloxymethyl)‐benzene, 1,3‐bis(trimethylsiloxy)‐2,2‐dimethylpropane, and 1,3‐bis(trimethylsiloxy)‐2,2,4‐trimethylpentane have been synthesized and their properties compared with the Known compound 1,4‐bis(trimethylsiloxy)‐benzene.
The Alkaloid Content of the Chinese Drug “Moh‐ts'ao”, Desmodium Caudatum
Authors: Yeh Ping‐Yuan , Lin Lung‐Ching , Yang Shu‐Shu 
Published: June 2015

AbstractThe alkaloid content of the roots, the stems, and leaves of “Moh‐ts'ao”, Desmodium caudatum, was investigated. The crude alkaloid was isolated from the roots in a 0.12% yield and consisted of at least two kinds of alkaloids.The oxalate, the reineckate, and two Kinds of picrate crystals were prepared from the crude alkaloid. The hydrochloride and the perchlorate could not be isolated in crystalline form. The decomposition of the oxalate gave one of the alkaloids in a pure state, as shown by paper chromatography.
Spectrophotometric Study of Cerium(III) and Thorium(IV) Chelates of trans‐I, 2‐diaminocyclohexane‐N, N, N′, N′‐ Tetraacetic Acid (DCTA)
Authors: Hseu Tong‐Ming , Young Chung‐Chang 
Published: June 2015

AbstractInteraction between DCTA and Ce(III) ion has been investigated spectrophotometrically. It has been found that the Ce(III)‐DCTA chelate in aqueous solution (pH 4.25) exhibited a characteristic absorption maximum at 305 mμ. The absorption of Ce(III)‐DCTA chelate is considerably diminished by the addition of small amounts of Th(IV) ion. This phenomenon is used as the basis of a simple spectrophotometric scheme for the quantitative determination of Th(IV) ion and the evaluation of the formation constant of Th(IV)‐DCTA chelate. The composition of Ce(III)‐ and Th(IV)‐DCTA chelates were 1:1 and the corresponding formation constants (log Kf) of the chelates were 16.87 and 23.76 at 25°C and an ionic strength of 0.1 (KNO3), respectively. The application of this system to the determination of traces of Th(IV) ion has been demonstrated.
Coulometric Efficiency of Anodic Deposition and Cathodic Stripping of Bromide at Silver Electrode
Authors: Lin Zui Feng , Chen Li‐Shu 
Published: June 2015

AbstractAnodic deposition and cathodic stripping of bromide at varying concentrations in 0.1 N KNO3 medium at silver electrode was studied by constant current method. The apparent coulometric efficiency could be explained with Laitinen's model. Modified Tafel plots were given and the transfer coefficient, α, was calculated to be 0.5 for the reversible anodic step. Two distinct steps in anodic deposition of bromide were definitely observed. Reduction of oxygen with low current density in 0.1 N KNO3 and at silver electrode was examined and was found to do no harm if deaeration was done by Meites technique. Constant current potentiometry model was proposed to explain the potential concentration relation.
Study on the Solvent Extraction with Radio‐Tracers. I. Extraction Study on Protactinium‐233 with the Noyltrifluoroacetone
Authors: Chen Ying‐Mao 
Published: June 2015

AbstractProtactinium‐233, separated from the irradiated thorium, was used as a tracer for the extraction study with thenoyItrifluoroacetone. From the results obtained by the variation of acidities of HCl with the constant concentration of TTA in benzene, a slope of −2 was obtained by plotting the distribution coefficients against acidities. With a definite acid concentration of HCl in the aquous solution and by the variation of TTA concentration, a slope of 4 was obtained by plotting the distribution coefficients against the concentration of β‐diketone. With these results, species extracted by the organic layer was assumed to be Pa[TTA]2[HTTA]2. If the composition of the organic layer was changed by the addition of the following solvents into the TTA in benzene solution, the order of the extraction was found as follows:n‐amyl alcohol > cyclohexane > chloroform > n‐hexane > carbon tetrachloride > benzene > nitrobenzene > hexone > cyclohexanone > n‐butyl alcohol.
Chemical Studies of Formosan Cobra (Naja Naja Atra) Venom: Part II. Isolation and Characterization of Guanosine, Adenosine, and Inosine from Cobra Venom
Authors: Lo Tung‐Bin , Chen Yee‐Hsiung 
Published: June 2015

AbstractA non‐protein fraction from crude Formosan cobra venom was found to be a nucleoside mixture. The components were identified as guanosine, adenosine and inosine by paper chromatographic and polyamide thin‐layer chromatographic correlations and their spectroscopic data. The mole ratio of guanosine/adenosine/inosine was found to be 7:2.5:1.
Synthesis and Infrared Absorption Spectra of α‐methyl‐2′‐hydroxy‐chalcones: I. α‐methyl‐2′‐hydroxychalcone and its 4‐Substituted Derivatives
Authors: Lin Chi‐Hsiung , Yeg Chin‐Lung 
Published: June 2015

AbstractSix 2′‐hydroxychalcone derivatives with a methyl group on the α‐position were synthesized. Infrared absorption spectra of these new compounds are discussed taking their corresponding α‐hydrogen chalcoes which were also synthesized for comparison. This latter study is also utilized as a proof for the structures of these compounds of a new series.
Absorption Spectra of 5′‐carboxy‐2′‐hydroxychalcone and its Derivatives
Authors: Lin Li‐Chih , Chen Fa‐Ching 
Published: June 2015

AbstractUltraviolet absorption spectra and infrared absorption spectra of 5′‐carboxy‐2′‐hydroxychalcone and eleven derivatives substituted at side benzene nucleus are measured to elucidate the spectroscopic effects of the 5′‐carboxyl group in this series of compounds.
Proanthocyanidin from Persimmon Fruits
Authors: Chen F. C. , Reese Elwyn T. 
Published: June 2015

AbstractDegradative and other data described below have shown that the tannin of unripe fruits of persimmon (Diospyros virginiana) actually contains (+)‐gallocatechin unit in the structure and must be regarded as condensed flavonoid pigments, probably of similar structure to the polymeric proanthocyanidin from avocado seed.The possible structure of the proanthocyanidin from persimmon fruits is proposed tentatively as a polymer of 5, 7, 3′, 4′, 5′‐pentahydroxyflavanonol.
Extraction of Vanadium with α‐benzoin Oxime Dissolved in Chloroform
Authors: Chen Shou Nan , Lin Eyih 
Published: June 2015

AbstractThe extraction characteristics of vanadium (V), with α‐benzoin oxime dissolved in chloroform have been investigated. The most favorable condition for the extraction has been found in the pH range of 1.8 to 2.4 and 2.6 to 3.0, corresponding to sulfate and HCI‐KCI used as a buffer, respectively, but the extracting power was found rather good when sulfate buffer was used.A solution of 2×10−2 M α‐benzoin oxime in chloroform was used, and 1×10−4 to 2×10−2 M of vanadium (V) (added ac NaVO3) were used, and about 88% of vandium was extracted favourably by single extraction, and about 97% by double extractions.The effects of shaking time, concentration of α‐benzoin oxime and diverse ions have also been investigated. Vanadium (V) can be readily extracted in the presence of copper (II), cobalt (II), nickel (II), aluminum (III), iron (III), silver (I), zirconium (IV) and chromium (III).
Kinetic Studies on the Esterification of Acid and Alcohol in the Presence of Dowex 50W and of Sulfuric Acid
Authors: Huang Ting‐Chia , Wan Jassen , Tsai Lung‐Hai 
Published: June 2015

AbstractSeveral kinds of alcohol have been chosen to react with succinic acid, and several organic acids have been chosen to esterify with n‐butyl alcohol using either Dowex 50 W or sulfuric acid as catalyst. The rate constants are influenced by the temperature, the structure of reactants, and kinds of catalyst; the activation energies are also varied with different reactants and catalysts. The catalytic effect of hydrogen ion is not a simple form, and the possibility of exciting either the acid or the alcohol to its activated state was assured to be affected by their molecular structures. The values of ΔH*, ΔG*, and ΔS* of reactions have been calculated and discussed.
Study on the Analysis of Acrylonitrile Prepared from Liquefied Petroleum Gases by Gas Chromatography
Authors: Li Shih‐Chang , Huang Wu‐Tong 
Published: June 2015

AbstractThe principle product of acrylonitrile compounds could be analyzed by gas chromatography with fast, accurate and good results. The compounds which were made by liquefied petroleum gases (L.P.G.), ammonia and air with catalyst of Pt gauze at high temperature in the reactor, were identified and calculated according to their peak areas as following: hydrogen cyanide was 4.1% by volume, acrylonitrile was 75.7%, acetonitrile was 9.1% and ethylcyanide was 11.1%.
Polarized Raman Spectra II. Anthracene Crystal
Authors: Ting Chen‐Hanson 
Published: June 2015

AbstractThe polarized Raman spectrum in crystalline anthracene is recorded using an Ar+ laser as the light source. With the polarization data, empirical criteria of assigning molecular vibrations to Ag and Bsg representations are derived. These criteria are discussed in the light of the theory developed in Part I of this series.1The lack of vibrational exciton structures in the spectrum of anthracene crystal is the strongest evidence to discredit the conventional polarizability theory and to support the theory presented in Part I.The assignments of 11 Ag and 9 Bsg vibrations in anthracene‐h10, and also 12 Ag and 7 Bsg vibrations in anthracene‐d10 are reported.
Polyamide Layer Chromatography of Alkaloids
Authors: Hsiu Hsing‐Chien , Huang Jen‐Tzaw , Shih Tzu‐Bi , Yang Kun‐Lin , Wang Kung Tsung , Lin Alice L. 
Published: June 2015

AbstractThirty alkaloids were separated by polyamide layer chromatography. The Rf values on seven solvent systems were tabulated and their behavior discussed.
The Constituents of the Root Oil of Maclura Pomifera
Authors: Huang C. L. , Harwood A. A. 
Published: June 2015

AbstractThe fatty acids and the unsaponifiable matter in the root oil ofMaclura pomiferaRaf. were investigated. The root oil was saponified and the following fatty acids were identified: Myristic, oleic, and linolenic acid. Three crystalline substances; lupeol, β‐sitosterol and a new compound were isolated from the unsaponifiable matter of the oil. The NMR, UV and IR spectra of this new compound are reported.