bluuebunny/crossref_metadata_2025_split huggingface dataset:
Studies of the Solution Polymerization of Vinyl Acetate in the Aqueous Solution of Partially Acetylated Polyvinyl Alcohol. IV. The Interfacial Properties of the Graft Polymer
Authors: Lin Chen‐Chong 
Published: June 2015

AbstractThe interfacial properties of the graft polymer, which consists of polyvinyl alcohol with polyvinyl acetate branchings prepared according to the procedure given in the previous papers, have been investigated. No significant difference between the inward and outward form of the graft polymer in interfacial tension has been observed, but remarkable differences in the ability of foming fine droplets and in the stability of the emulsion were found. This seems to‐be attributable to the existence of two configurational forms of the graft polymer of which the affinity with the oil phase are different from each other. It is conceivable that neither form of the graft polymers has a solubilization power for water insoluble substances. But the effect of substances slightly soluble in water on the viscosity of the polymer solution is dependent on the different configurational conditions of the polymer molecule in solution. This is considered to depend on the intra‐action of the polymer molecules, the interaction between the polymer molecules, and the medium into which the substances dissolve.
Polarographic Determination of Zirconium and Hafnium with EDTA
Authors: Pan Kuan , Sun Peng‐Joung , Wong Wen‐Kuei 
Published: June 2015

AbstractCadmium EDTA complexes in the acetate buffer has been used as an indicator electrolyte in the determination of zirconium and hafnium as EDTA complexes at pH 4.2. The polarographic determination of zirconium and hafnium could be made with solutions of concentrations as low as 10−6 molar or 0.1 p.p.m. The results were compared with those obtained by potentiometric titration of the free cadmium ion in the concentration range 10−3 to 10−4 molar using cadmium amalgam as an indicator electrode.
Solvent Extraction of Uranyl Thiocyanate Complex. I
Authors: Lai Tsai‐Teh , Lin Han‐Ton 
Published: June 2015

AbstractThe systematic study on the extraction behavior of uranyl thiocyanate with a mixture of isoamyl alcohol and ethyl acetate is described.A uranium solution containing 1M to 3M of thiocyanate at pH range 1.0 to 3.0 was extracted quantitatively with a mixture of isoamyl alcohol and ethyl acetate (1:3). With a single extraction, the maximum amount of uranium passing into the organic solvent attained 96.5%.
Chelatometric Titration of Lanthanum with Gallein Indicator
Authors: Sun Peng‐Joung 
Published: June 2015

AbstractA method using Gallein as indicator for the direct titration of lanthanum with disodium salt of EDTA was proposed. With this indicator, lanthanum ion can be titrated at the pH of 5.5 to 6.5, using hexamethylenetetramine as buffer.At the end point, the violet color disappeared, giving rise to a red color. The interference of approximately equimolar concentration of various foreign ions was observed.Rare earth metal may be titrated along with lanthanum under the same conditions, as shown by the presence of cerium ion.
Polarisability of Some Organic Liquids from Polarisation at Optical Frequency. II. Acetone Ether and Ethanol
Authors: Ke Jenn , Lin Jar‐Shyong , Lin Wei‐Chuwan 
Published: June 2015

AbstractRefractive indices of the series of binary solution systems water acetone, acetone ethyl alcohol, ethyl alcohol ether and sodium perchlorate water were measured, and polarisabilities of the related organic liquids were determined on the basis os Böttcher's formula for refraction of mixture assuming the applicability of the additivity rule.
Determination of the Dissociation Constants of Rosolic Acid by Spectrography
Authors: Lin Tsong‐Hsing 
Published: June 2015

AbstractRosolic acid was found to exhibit an absorption maximum at 480 mμ which shifts toward longer wave‐lengths in alkaline solutions. Spectrophotometic observation on this absorption maximum was made, and the optical density vs pH curve was found to pass through a minimum at pH=5.98. By using Thamer and Vaigt's method, the author was able to evaluate the dissociation constants of rosolic acid.
Determination of Vanadium by the Extraction of Vanadium(III) Thiocyanate with Methyl Ethyl Ketone
Authors: Lai Tsai‐Teh , Chen Shou‐Nan 
Published: June 2015

AbstractThe spectrophotometric study on the extraction behavior of V(III) thiocyanate complex, with methyl ethyl ketone is described.The greenish yellow color extract shows a absorbance maximum at 395 mμ in 1.0 to 2.8 N HCl solution, and the molar absorbancy index of the extract is 4,313. Beer's Law is valid over a range from 0.01 mg to 0.1 mg of vanadium.The optimum concentration of SnCl2 for the reduction of vanadate was found at the range between 0.2 N and 0.4 N.The minimum variation of the volume of organic solvent layer and aqueous layer after equilibration was found when the solution was 1.8 to 2.4 N in HCl, 0.35 to 0.65 N in SnCl2 and 0.9 to 1.2 M in NH4CNS.
Chelatometric Titration of Cobalt and Nickel with Gallein as Indicator
Authors: Sun Peng‐Joung , Chou Fa‐Chun , Yeh Cha‐Pying 
Published: June 2015

AbstractIn continuation of a series of chelatometric titration of metal ion with gallein indicator, two procedures for the EDTA titration of cobalt and nickel using gallein as indicator were proposed. In one procedure cobalt ion was titrated with standard 0.05 M EDTA solution in ammonium chloride buffer by stepwise addition of ammonia to keep the pH at the optimum value of 8. A sharp color change from violet to rose red indicating the end point can be observed. In another procedure nickel ion was titrated with standard 0.05 M EDTA solution at pH 8 to 9 in ammonia‐ammonium chloride buffer solution. The end point is indicated by a color change from bluish violet to rose red.The interference caused by the presence of approximately equal molar concentration of various foreign ions was observed.
Mannich Bases Derived from 3‐Pipecoline, 4‐Pipecoline and 2, 6‐Dimethylmorpholine
Authors: Sun Frank Cheng 
Published: June 2015

Abstract3‐Methylpiperidine, 4‐methylpiperidine, and 2, 6‐dimethylmorpholine were used to condense separately with sixteen different ketones and paraformaldehyde to yield various Mannich bases. All the hydrochlorides of Mannich bases prepared in this work were tested for their solubilities in water, in 0.1N hydrochloric acid and in 0.1N sodium hydroxide.
Synergistic Effect in the Solvent Extraction of Thorium
Authors: Yeh Si‐Jung , Chu Po‐Chen 
Published: June 2015

AbstractBy using Th‐234 as tracer, the synergistic effects in the extraction of thorium from aqueous solutions with mixtures of organic solvents were investigated for the system Th4+/β‐diketones/TBP/diluents. Four β‐diketones, i. e., acetylacetone, benzoylacetone, dibenzoylmethane and trifluoroacetone, were used. Synergistic enhancements on the distribution ratios were observed in all cases except when acetylacetone was used as the chelating agent at the pH range of 2–3. Based on the experimental observations, a plausible mechanism for the synergistic effect has been suggested. The effect of diluent is also dicussed.
Infrared Absorption Spectra of Halogenoflavonoids. II. 7‐Halogenoflavonoids
Authors: Lin Chi‐Hsiung , Su Jen‐Tsu , Chen Fa‐Ching 
Published: June 2015

AbstractInfrared absorption spectra of seventeen 7‐halogenoflavonoids in KBr disks are observed with an Infracord Spectrophotomter. Absorption bands in the regions 3,500–1,400 cm−1 and 1,000–650 cm−1 are discussed.
Cathodic Action of the Metal Complexes at the Dropping Mercury Electrode. XI. Uranyl‐Antipyrine Complex
Authors: Lai Tsai‐Teh , Lin Han‐Ton 
Published: June 2015

AbstractThe polarography of uranium in antipyrine solutions was studied in detail. A reversible and diffusion controlled wave was obtained over pH 1.5 to 4.7 and antipyrine concentration ranging from 0.016 M to 0.631 M. At pH between 2.3 and 4.7, the half‐wave potential wasindependent of pH value. At pH lower one hydrogen than 2.3, ion was involved in the reduction. The U(VI)‐antipyrine compound was found to be a chelate species of UO2A2+2 and UO2A2+2 in antipyrine of concentratration lower than 0.155 M and at pH 3.5, but was a simple complex species of UO2AG+2 in antipyrine of concentration higher than 0.155 M. The value of ia/C is constant at 2.7 and 3.2 for pH value 2.0 and 3.5 respectively, over a 4.4 × 10−4 M to 5.5 × l0−3 M range of uranium concentration.
Polyamide Thin‐Layer Chromatography. III. A Modified Method of Preparation of Thin‐Layer and its Application to some Naturally Occurring Phenolic Substances
Authors: Wang Kung‐Tsung , Lin Yau‐Tang 
Published: June 2015

AbstractSome modifications on the preparation of thin‐layer were made. By using the modified thin layer, the time required for development was shortened to one to two hours. Temperature and humidity effects for the thin‐layer formation are discussed. Small plates with the dimension 5×5 cm were prepared for horizontal development for preliminary solvent and color tests.The crude extractives of leaves of six plants, comprising Evodia glauca Miq., Glycosmis cochinchinensis Pier, Clausena lumulata Hayata, Atalantia buxifolia Oliver, Pittosporum formosanum Hayata, and Murraya paniculata Jack., were investigated by polyamide thin‐layer chromatography. It was observed that the crude extractives gave satisfactory chromatogram.
Spectrophotometric Studies of Dioxo‐Complexes of Quadrivalent Metals. II. Thorium Chelate of Pyrogallolsulfonephthalein
Authors: Pan Kuan , Lin Zui‐Feng , Wu Yu‐Lin 
Published: June 2015

AbstractPyrogallolsulfonephthalein (abbreviated to PR) and its thorium chelate was spectrophotometrically studied in perchloric acid and perchlorate solution at various pH's. PR shows an absorption maximum at 478 mμ. at pH 3.0, which in the presence of thorium (IV) ion shifts to 544 mμ. The optimum pH for the formation of the chelate was found to be 2.7 to 3.2 and the mole ratio of Th(IV) to PR was 1:1. The instability constant was found to be 1.40×10−16 at ionic strength, μ=0.01.
Sorption of Radiocesium by Soil
Authors: Cheng Hwa‐Sheng , Hamaguchi Hiroshi 
Published: June 2015

AbstractThe sorption of radiocesium (Cs‐134) by seven different samples of soil has been studied over a wide pH range (0–14). In general, the sorption is excellent except in the low pH region. The presence of 0.01 N Na +, Mg++, Ca++, Sr++, Ba++ and Al+++ does not seem to influence either the uptake of radiocesium by, or the extraction of the sorbed radiocesium from, Red soil and Yellow soil.
Enrichment of Cobalt‐60 Activity by Szilard‐Chalmers Process
Authors: Yinand Moon‐Lung , Lee Tung‐Ching 
Published: June 2015

AbstractIn order to investigate the feasibility of producing enriched Co‐69 activity by Szilard‐Chalmers process, the complexes tris‐[1‐nitroso‐2‐naphthol] Co(III) (A), tris‐ethylenediamine Co(III) chloride (B) and potassium cobalticyanide (C) have been prepared and used for investigation. The percentage activity yield and enrichment factor for each complex have been estimated. The observed highest values of enrichment factor for the complexes (A), (B) and (C) were 287, 18.8 and larger than 3,300 respectively.
LCAO‐MO Energy Levels of Open‐Chain Hexaatomic π‐Orbital Systems with One Heteroatom
Authors: Lin Chi‐Hsiung 
Published: June 2015

AbstractFourteen open‐chain hexaatomic π‐orbital systems with one heteroatom are treated with the Hückel theory. From solutions of the secular equations, the dependence of π‐orbital energy levels on the heteroatom's Coulomb integral is studied. Applications to π‐bond energies, activation energies, and ultraviolet absorption maxima are discussed.
Infrared Absorption Spectra of Haloflavonoids. V. 3′‐Haloflavonoids
Authors: Lin Chi‐Hsiung , Lin Li‐Chih , Chen Fa‐Ching 
Published: June 2015

AbstractInfrared absorption spectra of eleven 3′‐haloflavonoids in KBr disks have been observed with an Infracord Spectrophotometer. Absorption bands in the region 3, 500–650 cm−1 are discussed.
Activation Analysis of Trace Impurities in Aluminum
Authors: Ke Chiung‐Huei , Cheng Hwa‐Sheng 
Published: June 2015

AbstractTrace impurities in aluminum were determined. Manganese, nickel, copper, cobalt and iron were analyzed by the metod of activation analysis at the THOR, while sodium and potassium were determined by flame photometry. The results were: Mn 0.00066%, Ni 0.00041%, Cu 0.00060%, Co 0.00010%, Fe 0.12% and Na 0.0048%. K was not detected by flame photometry.
A Study of the Extractive Constiuents from the Wood of Libocedrus Formosana, Florin. VIII The Phenolic Components. Shonanol, a New Diterpene Phenol
Authors: Lin Yau‐Tang , Liu Kwang‐Ting 
Published: June 2015

AbstractThen‐hexance‐soluble phenolic part of L. formosana contains at least fourteen components in which carvacrol,o‐isopropyl phenol,m‐isopropyl phenol and phenol have been identified by polyamide thin‐layer chromatography. A new diterpene phenol, shonanol, was isolated and its most probable structure was assigned as VIII from spectral evidence. Hydrothymoquinone derivatives which are the major constituents of Libocedrus decurrens (Heyderia decurrens) have not been found in L. formosana.
Enrichment of Chromium‐51 by Szilard‐Chalmers Process. II
Authors: Yeh Si‐Jung , Tsai Chung‐Hsiung 
Published: June 2015

AbstractEnrichment of chromium was studied by means of Szilard Chalmers process. Potassium chromate was used as the target material. The ruptured chromium was separated from the target by three different methods which gave different enrichment factors in the range of 650–1400.A systematic study was made to investigate the relationship be tween irradiation time and enrichment factor. It was found that the enrichment factor decreases with the increase in irradiation time. The effect of cooling time on the enrichment factor was also studied.
Comparison of Some Steroxysilanes
Authors: Liu Sheng‐Lieh , Lin Hung‐Leo 
Published: June 2015

AbstractFour Stigmasteroxysilanes were synthseized. By comparing their properties with those of cholesteroxysilanes previously reported, it was found that no parallelism holds between the melting point curves of these two series of steroxysilanes. Infrared absorption at 900–910 cm−1 was proved to be characteristic of the Si‐O‐C bond between steroid and silicon atom. Tristigmasteroxytrimethylcyclotrisiloxane is for the first time reported.
Polyamide Layer Chromatography. VIII. Preparation of Polyamide Layer on Poly(ethylene terephthalate) Film and its Application to Aromatic Nitro Compounds
Authors: Wang Kung‐Tsung , Wang Iris S.Y. , Lin Alice L. 
Published: June 2015

AbstractPoly(ethylene terephthalate) film was used as supporter for preparation of polyamide layer. The most convenient method of preparation was described. This layer can be cut into any size and its sensitivity is higher than the glass plate supported layer. Twenty aromatic nitro compounds were used to show the behavior of polyester film based polyamide layer.
NMR Studies on the Effect of Solvents on the Dimerization of Benzoic Acid
Authors: Tsay Shyr‐Jin , Lin Wei‐Chuwan 
Published: June 2015

AbstractThe chemical shifts of carboxyl proton in benzoic acid have been measured in a variety of solvents. The characteristic monomer and dimer chemical shifts have been evaluated at 23°. A detailed discussion is given to illustrate the solvent shifts of carboxyl proton, from which the dielectric constant of solvent is considered as the main factor.The plot of carboxyl proton shift against (∈—1)/(∈+1) reveals a roughly linear dependence, indicating that a high field shift will be brought about by an increasing dielectric constant of solvent. Another linear relationship between log (δ—δD) and log ∈ suggests that an increase of ∈ will destroy the cyclic dimer, leading to an increase of the monomeric population and therefore to a higher field of the carboxyl proton signal.
Dissociation Constants and Chelate Stability Constants of Some Dihalogenated 8‐Hydroxyquinaldines
Authors: Chang Tiao‐Hsu 
Published: June 2015

AbstractThe acid dissociation constants of dihalogenated 8‐hydroxyquinaldines and the stability constants of their chelates with Zn[II], Ni[II], Co[II], Pb[II], Cd[II], Mn[II], and Mg[II] have been determined. The Calvin‐Bjerrum potentiometric titration technique was used in studying the behavior of these substances. The order of decreasing stability of the metal chelates Zn, Nc>Co>Pb>Cd>Mn>Mg is similar to the stability sequence generally obtained for divalent metals, and the order of decreasing stability of dihalogenated 8‐hydroxyquinaldines to form the metal chelates with metal ions is I>Br>Cl. Spot test reactions of dihalogenated 8‐hydroxyquinaldines and 8‐hydroxyquinolines with the metal ions also have been investigated.
Spectrophotometric Studies on Ferron and Thorium (IV)‐Ferron Chelate
Authors: Hseu Tong‐Ming , Chen Li‐Shu 
Published: June 2015

AbstractThe ionization constants of ferron (7‐iodo‐8‐hydroxyquinoline‐5‐sulphonic acid) and the interaction between Th(IV) and ferron have been studied spectrophotometrically at 25° and ionic strength of 0.1. The ionization constants were found to be pK1=2.41±0.01, pK2=7.10±0.01. The Th(IV)‐ferron chelate in aqueous solution of pH 5.0 exhibited a characteristic absorption maximum at 365 mμ. The composition of Th(IV)‐ferron chelate was 1:4 mole ratio of Th(IV) ion and ferron, and the stability constant (log Kg) was 26.22±0.16.
Syntheses of Some 2‐(3,4‐dihydro‐α‐pyranyl)‐methoxysilanes
Authors: Liu Sheng‐Lieh , Wei I‐Yuan 
Published: June 2015

Abstract3,4‐Dihydro‐α‐pyran‐2‐methanol was treated with different chlorosilanes to give different Si‐O‐C compounds. Five new compounds, trimethyl[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane, dimethylbis[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane, methyltris[2‐(3,4‐dihydro‐α‐pyranyl) methoxy]silane, methyldipheny [2‐(3,4‐dihydro‐α‐pyranyl) methoxy]silane, and methylphenylbis[2‐(3,4‐dihydro‐α‐pyranyl)methoxy]silane are described.
Anomalous Nitration Reactions of Halotropones and Tribromotropolone
Authors: Lin Lung Ching , Yang Mo‐Tai 
Published: June 2015

AbstractNitration of 2‐bromo or 2‐chlorotropone gave a new compound, 2,7‐dinitrotropone: The halegen atom on the 2‐position was displaced by the nitro group through an electrophilic substitution reaction. Nitration of 3,5,7‐tribromotropolone gave 3,7‐dibromo‐5‐nitropolone: the nitro group again displaced the bromine atom at position 5.
Chemical Studies of Formosan Cobra (Naja Naja Atra) Venom: Part III. N‐Terminal Amino Acid Analysis of Some Purified Protein Components by DNP and DNS Methods
Authors: Lo Tung‐Bin , Chang Qui‐Linn 
Published: June 2015

AbstractN‐Terminal amino acid residues of Fractions IX, X, and XII were reinvestigated by DNP and DNS methods with two‐dimensional polyamide thin‐layer chromatography. It was found that our previous work1 had been erroneously concluded. By the present work, it was obvious that all three fractions had Leu as their N‐terminal amino acid residues.
Supplementary Observations on the Chemistry of the Alkaloids of Berberine Series and Related Compounds I. Reexamination of Synthetic Reactions
Authors: Sebe Eigai , Ishigami Kichiji , Aizawa Tsutomu , Tsuchiua Shigeru 
Published: June 2015

AbstractSyntheses of berberines, oxyberberines, and tetrahydroberberines were reported previously. In the present paper some new observations which have not hitherto been reported will be described.
Studies on the System Iron‐DTPA
Authors: Chu Shu‐Kung , Liu Sung‐Tsuen , Chen Shu‐May 
Published: June 2015

AbstractThe iron‐diethylenetriaminepentaacetic acid (DTPA) system has been investigated polarographically over the pH range 3–10 in the absence of maximum suppressor. The iron (III) complex is reversibly reduced at the dropping mercury electrode. Polarograms of mixtures of iron (III) and iron (II) yield a composite cathodic / anodic wave in the presence of excess DTPA. The half wave potential of the system is constant in the pH region 5.5–9, and from this the ratio of the stability of iron (III) DTPA to iron (II) DTPA has been evaluated. The stability constant of the ferric complex has been obtained from a spectrophotometric analyse of its dissociation equilibrium in 0.4–1.0 M perchloric acid medium at wavelength 380–520 mμ. μ dependence of the acid dissociation constant of DTPA verified that the Davies quation can be extended to μ = 1.0
Technetium‐99m Generator
Authors: Cheng Wen‐Pin , Yeh Si Jung 
Published: June 2015

AbstractA systematic study was made to prepare technetium‐99m generator for domestic uses in the fields of nuclear medicine and biological tracer work by using molybdenum‐99 produced by Tsing Hua Open‐pool Reactor (THOR). Alumina was used as generator bed and technetium‐99m was milked by physiologic saline solution. It was found that it is feasible to prepare technetium‐99m generator by which medically acceptable technetium‐99m solution can be obtained for practical applications.
Labelling of Human Serum Albumin with Iodine‐131
Authors: Lo Jiunn Guang , Yeh Si Jung , Chen Teng Yueh 
Published: June 2015

AbstractBy using iodine‐131 prepared in the radioisotope laboratory of the National Tsing Hua University, a systematic study was carried out to prepare iodine‐131 labelled human serum albumin (RISA) for domestic use as a radiopharmaceutical. Special emphasis was placed on the purification of RISA in an attempt to meet the specifications required by medical workers. The optimum conditions for radioiodination reaction and purification procedure are discussed in details. It was concluded that the RISA prepared in the Tsing Hua Laboratory is acceptable for radiopharmaceutical use.
Polyamide Layer Chromatography XIV Aspect on Quantitative Analysis
Authors: Wang Kung‐Tsung , Wang Iris S.Y. , Yuan Sun‐Shin , Wu Po‐Hsiung 
Published: June 2015

AbstractTen common dinitrophenyl amino acids were used to test the performance of polyamide layer chromatography for quantitative analysis. The polyamide layer is used as the stationary phase and U. V. photometric method is employed for quantitative estimation. The results show that high accuracy of quantitative analysis by polyamide layer can be achieved. Possibility of repeated use of polyamide layer was discussed also.
Thermodynamics of Mercurous Acetate from E M. F. Measurements
Authors: Chen Li‐Shu , Pan Kuan 
Published: June 2015

AbstractMeasurements of the e.m. f.'s of the cell, have been made over a temperature range from 15° to 40°C. The standard e.m.f. of the Hg/Hg2Ac2(s), Ac− electrode was given by E0=−0.8640+1.832×10×3T−21.84×10−7T2. The thermodynamic properties of the reaction, Hg2Ac2(s)+2Cl−=Hg2Cl2(s)+2Ac− and those for the formation of Hg2Ac2(s) at 25°C were Computed.
Reaction of Methyl Iodide‐Mercuric Iodide with Phenothiazines
Authors: Huang C. L. , Gupta R. K. 
Published: June 2015

AbstractReaction of phenothiazine with methyl iodide in the presence of mercuric iodide did not yield a product with a methyl group attached to the sulfur atom. Instead, a quaternary ammonium salt was obtained. This paper is intended to provide correct information with supporting evidence for this raction.
Huckel Molecular Orbitals in Homonuclear Diatomic Molecules — A Comment on the Extended Huckel Theory
Authors: Ting Chen‐Hanson 
Published: June 2015

AbstractThe extended Huckel theory suggesteted by Hoffmann can be further simplified by neglecting the differential overlap integrals. The results agree fair well with the SCF‐MO theory in the cases of B2, C2, N2, O2, and F2.
Stereochemistry of the Elimination of Norcamphor‐ and Apocamphor Tosylhydrazone with Methyllithium
Authors: Liu Kwang‐Ting , Shapiro Robert H. 
Published: June 2015

AbstractUpon treatment with three equivalents of methyllithium in ether at room temperature exo‐3‐d‐norcamphor tosylhydrazone gave norbornene which retained 21% of the deuterium and exo‐3‐d‐apocamphor tosylhydrazone gave apobornylene which retained 50% of the deuterium based on nmr and mass spectral analysis. In both cases exo‐elimination is favored when the primary isotope effect is considered. The relatively low selectivity between exo‐and endo‐elimination as compared with that observed in solvolytic studies was tentatively rationalized by the carbarion character of the transition state leading to proton abstraction by the base.