bluuebunny/crossref_metadata_2025_split huggingface dataset:
Formation Constants of Chromium (III)-Oxalato Complexes
Authors: Nagata Kyoichi , Umayahara Akira , Tsuchiya Ryokichi 
Published: July 2006

Abstract
The formation constants of chromium(III) complexes with the oxalate ion, which is the simplest bidentate ligand coordinating by two oxygen atoms, have been determined by the pH method.
It has been shown that the formation constants of oxalato chromium(III) complexes are larger than those of the corresponding titanium-(III) complexes, but smaller than those of the corresponding manganese(III), iron(III) and cobalt(III) complexes in the first transition series.
The formation constants of oxalato chromium(III) complexes have been found to be remarkably smaller than those of the ethylenediamine chromium(III) complexes. This result suggests that two nitrogen atoms form a more stable complex with chromium than do the two oxygen atoms serving as donors in the bidentate chelate.
Electrometric Studies on the Reaction between Silver and Alkali Metavanadate
Authors: Saxena R S , Sharma O P 
Published: July 2006

Abstract
The reaction between Ag+ and VO3− ions has been investigated by means of electro-metric techniques involving amperometric, potentiometric and glass electrode titrations between silver nitrate and Na2O·V2O5 in 40% alcoholic media. The end point obtained from the sharp breaks and inflections in the titration curves, occurs at a stage where the molecular ratio of Ag+ and VO3− ions is 1:1 and corresponds to the formation and precipitation of silver metavanadate, Ag2O·V2O5, in the pH range 6.25–7.0. Amperometric titrations yield very accurate results and offer a simple and rapid method of determining vanadium (V) as silver metavanadate.
Phosphorylation by the Use of Diethylphosphorosuccinimidate
Authors: Mukaiyama Teruaki , Obata Teisuke , Mitsunobu Oyo 
Published: July 2006

Abstract
Phosphorylation of alcohols, phenol, and dialkyl hydrogen phosphates by means of diethylphosphorosuccinimidate has been described. Phorphorylation of alcohols with diethylphosphorosuccinimidate could only be carried out in the presence of certain acid catalysts; while more acidic compounds such as phenol and dialkyl hydrogen phosphates were readily phosphorylated to give the corresponding phosphate and sym.- or unsym.-pyrophosphate in quantitative yields even in the absence of catalysts.
The Distribution of Gas Molecules at the Diffraction Center in the Electron Diffraction Experiment
Authors: Morino Yonezo , Murata Yoshitada 
Published: July 2006

Abstract
A method has been proposed for estimating the distribution of gas molecules at the diffraction center in order to evaluate the correction for finite sample size in gas electron diffraction. The distribution measured in this way has been interpreted by a simple model regarding the motion of the gas molecules in the vicinity of the nozzle. A slight asymmetry of the nozzle construction produces in the atomic distances a deviation which cannot be disregarded if an accurate measurement is desired.
The Dimerization of Benzoic Acid in Carbon Tetrachloride and Chloroform
Authors: I’haya Yasumasa , Shibuya Tai-ichi 
Published: July 2006

Abstract
The dimerization equilibrium of benzoic acid has been studied by high resolution infrared spectroscopy over a wide range of acid concentrations. The concentrations of the monomer and the dimer fractions have been determined from the integrated intensities of the respective carbonyl-stretching vibration bands. The calculated equilibrium constant is 2300 l.mol−1for carbon tetrachloride and 400 1. mol−1 for chloroform, both values being considered more reliable than that determined by peak intensity measurements. A weak association of chloroform with benzoic acid has been suggested as occurring through hydrogen bonding to the monomer carbonyl.
Syntheses of Peptides Related to the N-Terminal Structure of Corticotropin. V. Synthesis of the Peptide Fragments, His-Phe-Arg-Try, His-Phe-Arg-Try-Gly and Glu-His-Phe-Arg-Try-Gly
Authors: Inouye Ken 
Published: July 2006

Abstract
1) Synthesis of the peptides l-histidyl-l-phenylalanyl-l-arginyl-l-tryptophan, l-histidyl-l-phenylalanyl-l- arginyl -l-tryptophyl-glycine and l-glutamyl-l-histidyl-l-phenylalanyl-l-arginyl-l-tryptophyl-glycine, which corresponded to the amino acid sequences of positions 6–9, 6–10 and 5–10, respectively, of the corticotropin and α-MSH molecules, has been described.
2) The synthetic procedure for γ-t-butyl-l-glutamyl-l-histidyl-l-phenylalanlyl-l-arginyl-l-tryptophyl-glycine, a key intermediate to the higher peptides eliciting the adrenocorticotropic activity, has been improved.
3) An active ester Nα, NIm-dicarbobenzoxy-l-histidine p-nitrophenyl ester has been found to be of value for the synthesis of histidyl peptides.
4) An effective use of partition chromatography on a Sephadex column for purification of peptides has been cited.
Szilard-Chalmers Reaction of Trioxalatochromium Ion on Ion Exchange Resin—Static Irradiation and Its Kinetic Analysis
Authors: Sensui Yoshihiro , Matsuura Tatsuo 
Published: July 2006

Abstract
Trioxalatochromium ion, on Dowex 1X18 immersed in a solution of pH 2.0–3.85, was irradiated batch-wise in the thermal column of a reactor for various irradiation times. With decreasing pH, the 51Cr yield of the most enriched species (hexaquo- and monoxalatotetraquo-chromium ion) increased, but the enrichment factor decreased. With increasing irradiation time, while the changes in the 51Cr yield of each chemical form are small at pH 2.0, the recombination reaction becomes noticeable at pH 3.15 and 3.85. These results were analyzed kinetically, and the rate constants of the aquation and the complex formation under irradiation condition as well as the initial fractions of distribution of 51Cr and the total chromium among each chemical species were determined for the respective pH values.
Structure of Three-coordinated Copper(II) Complexes. Salicylalsalicylaminecopper(II) and Related Compounds
Authors: Inagaki Yoko , Ohashi Osamu , Kishita Michihiko , Kubo Masaji 
Published: July 2006

Abstract
On the basis of infrared spectroscopy and X-ray powder patterns, it is shown that 5-chlorosalicylalsalicylamine and its copper(II) salt are different from salicylal-5-chlorosalicylamine and its copper(II) salt, respectively, in the crystalline state. The nuclear magnetic resonance studies on salicylalsalicylamine and related compounds in solutions show that the double bond in the –CH=N–CH2- portion of these molecules is localized, i. e., the prototropic rearrangement of hydrogen atoms does not take place. Therefore, salicylalsalicylamine-copper(II) presents an example of a new type of three-coordinated copper (II) complexes showing a subnormal magnetic moment in spite of having ligands of a three-dimensional structure. This provides an additional evidence in favor of a presumption made by the present writers on the structure of three-coordinated copper(II) complexes showing a normal magnetic moment.
Electron Paramagnetic Resonance Study of γ-Ray Irradiated Phosphate Glasses
Authors: Nakai Yasuo 
Published: July 2006

Abstract
The EPR spectrum, consisting of a two-line structure and two other distinct types of weak resonances, obtained from irradiated phosphate glasses suggests that these paramagnetic centers are connected with the peculiar structure of phosphate glasses.
The two-line structure arises from an axiallysymmetric hyperfine interaction of a hole with a 31P nucleus. Two distinct types have been demonstrated: one is a trapped hole produced in the glass network, and the other is the trapped electron in the alkaline or alkaline earth ion. In phosphate glasses modified with such ions as calcium, barium or lithium that can coordinate with the tetrahedral oxygen atom in “End” groups (-PO3), the weak resonances seem to appear easily.
The Addition Reaction of Dinitrogen Trioxide with Cinnamyl Acetate
Authors: Kurihara Yoshie , Yamagishi Kazuo 
Published: July 2006

Abstract
This study of the reaction between dinitrogen trioxide and cinnamyl acetate has indicated that the 3-acetoxy-2-nitro-1-phenyl-1-propylnitrite (IIb) is formed, in addition to 3-acetoxy-1 - nitroso- 2 -nitro - 1 - phenylpropane (IIa), in yield depending on the experimental conditions. Those products have been transformed in good yields into 1, 3-dimethoxy-2-nitro-1-phenylpropane, from which dl-erythro-2-amino-1-(p-nitrophenyl)-l, 3-propanediol has been synthesized.
Chemical Effects Associated with β-Decay Process. I. The Chemical Behavior of a Decayed Product, 144Pr, in the EDTA Complex System
Authors: Shiokawa Takanobu , Kudo Hiroshi , Omori Takashi 
Published: July 2006

Abstract
The chemical behavior of 144Pr formed by the β−-decay of the 144Ce(III)-EDTA complex has been investigated. The chemical behavior of 144Pr is remarkably different from that of 144Ce. The results suggest that an increase in the nuclear charge of 144Pr plays the most important role in determining the yield of 144Pr ions and leads to the extensive disruption of the complex molecule by intramolecular electron - transfer. The liberated 144Pr ion reforms the complex according to its kinetic law. The recoil as a result of β−-decay seems not to be the cause of the formation of the free 144Pr ions.
Studies in the Two Phase System: Sodium Formate-Pyridine. VII. Extraction of Mercury
Authors: Deshmukh G S , Rao A L J 
Published: July 2006

Abstract
The distribution of mercuric mercury in the two phase system sodium formate-pyridine is studied. Almost quantitative extraction of mercury into pyridine is obtained from sodium formate (4 m) at a pH range of 7–7.5 with 5 ml. of pyridine and the extracted mercury is determined volumetrically using diphenylcarbazone as an internal indicator.
The Reaction of the Copper(II) Chelate of Ethyl Acetoacetate with Bromine and the Reactions of the Copper(II) Chelates of Acetylacetone and Ethyl Acetoacetate with Dry Hydrogen Bromide
Authors: Ogura Tetsuya , Kojima Yoshitane , Nakamura Yukio , Kawaguchi Shinichi 
Published: July 2006

Abstract
When the copper(II) chelate of ethyl acetoacetate reacts with bromine in dry dichloromethane, the chelate is broken, forming the α-bromoester and copper(I) or copper(II) bromide depending on the reactants’ mole ratio. However, in the reaction between bromine and the chelate at a mole ratio of 1 : 1 in dichloromethane saturated with water, copper-(I) bromide is not produced primarily; instead copper(II) hydroxide is formed, as is copper-(II) bromide.
In the reactions of the copper(II) chelate of acetylacetone or ethyl acetoacetate with dry hydrogen bromide at the mole ratio of 1 : 1 or 1 : 1.5, more than 98% of the total copper precipitated as copper(I) bromide. Even when 2 mol. of hydrogen bromide was employed against 1 mol. of the chelate, more than 90% of the original copper changed to copper(I) bromide, in contrast with the results obtained in a similar reaction with bromine.
The entire reaction pattern has been suggested employing a presumed intermediate binuclear complex containing a bromine double brigde.
Cobalt(II) Complexes of Schiff Bases Derived from Salicylaldehyde and Aromatic Amines
Authors: Nishikawa Hiroaki , Yamada Shoichiro 
Published: July 2006

Abstract
Bis(N-aryl-salicylideneiminato)cobalt(II) complexes, including several new compounds, have been prepared and their configurations examined. These cobalt(II) compounds have been concluded, from their electronic spectra, to have a tetrahedral configuration around the cobalt(II) ion. All these compounds in pyridine have been concluded to take an octahedral configuration with the exception of the N-o,o′-disubstituted cobalt(II) compounds.
The Determination of Micro Amounts of Polythionates. I. A Photometric Method for the Determination of Pentathionate by Means of Its Cyanolysis
Authors: Koh Tomozo 
Published: July 2006

Abstract
The photometric method for the determination of a small amount of pentathionate has been developed; it is based on the formation of thiocyanate equivalent to the pentathionate, and on the determination of thiocyanate with an excess of ferric iron.
The buffer solution is first added to the standard pentathionate solution so that the pH values of the mixture solution after the addition of the cyanide solution may be over an optimum range; othewise the pentathionate undergoes alkaline decomposition because of the higher pH value which results from the addition of the cyanide.
The conditions under which the reaction of pentathionate with cyanide is rapid and goes well to completion have been established by varying the cyanide amount, the pH, the reaction time, and the temperature.
The Oxidation-Reduction Potential of the System of Mn(II)EDTA-Mn(III)EDTA Complexes and the Stability Constant of Mn(III)EDTA Complex
Authors: Tanaka Nobuyuki , Shirakashi Takashi , Ogino Hiroshi 
Published: July 2006

Abstract
The standard oxidation-reduction potential of the system of Mn(II)EDTA-Mn(III)EDTA complexes has been determined to be E°MnY=0.579V. vs. SCE from the potentiometric measurement with the rotated platinum electrode. From this value the logarithmic stability constant of the Mn(III)EDTA complex (logKMn(III)Y) has been calculated to be 24.9 at 25.0°C and μ=0.2.
t-Amyloxycarbonyl as a New Protecting Group in Peptide Synthesis. I. The Synthesis and Properties of N-t-Amyloxycarbonylamino Acids and Related Compounds
Authors: Sakakibara Shumpei , Shin Masaru , Fujino Masahiko , Shimonishi Yasutsugu , Inoue Sumiko , Inukai Noriyoshi 
Published: July 2006

Abstract
It has been shown that the t-amyloxycarbonyl group (AOC group) can be introduced quite readily into amino acid esters by using t-amyl chloroformate as a reagent, and that the AOC group can be cleaved as smoothly as the t-butoxycarbonyl group (BOC group) under acidic conditions. Since this reagent is much easier to prepare than any other reagents used for the introduction of the BOC group, the new procedure is considered to be of great use in the practical synthesis of complicated peptides. 3-Methyl-3-pentoxycarbonylamino acids were also prepared by following the same procedure as was used in the case of AOC-amino acids.
Transition Metal Complex Catalysts for the Oligomerization of Butadiene. II. The Reaction of Catalyst Components
Authors: Tamai Katsumi , Saito Taro , Uchida Yasuzo , Misono Akira 
Published: July 2006

Abstract
In order to obtain some knowledge on the behavior of catalysts in the oligomerization of butadiene, the reaction between cobalt(III) acetylacetonate or iron(III) acetylacetonate and trietylaluminum has been investigated by means of magnetic susceptibility measurements, infrared spectra, gasometry, and electron spin resonance spectra.
When triethylaluminum was added to an excess of cobalt(III) acetylacetonate, the infrared spectra and gasometry suggested that the latter was reduced via stable cobalt(II) acetylacetonate to zero valent cobalt and that, at the same time, the former was transformed into aluminum(III) acetylacetonate. The extraordinarily large magnetic moment (μeff=12) and the absence of the signal of the electron spin resonance spectra suggested the formation of metallic cobalt. The metallic cobalt was active enough to be readily oxidized by the addition of methanol. The addition of butadiene to this solution decreased the magnetic moment to 7.8. This shows some coordination of butadiene to reduced cobalt.
When cobalt(III) acetylacetonate was reduced in the presence of an excess of triethylaluminum (Al/Co&gt;4), the zero valent cobalt was stablilized as a result of the formation of a certain diamagnetic complex with triethylaluminum. However, the addition of cobalt(III) acetylacetonate to this reaction mixture decomposed the above complex, and the very large magnetic moment indicated the formation of metallic cobalt.
Iron(III) acetylacetonate was, like cobalt(III) acetylacetonate, reduced to zero valent iron via stable iron(II) acetylacetonate. In the presence of an excess of triethylaluminum, however, zero valent iron did not form a stable complex with triethylaluminum, and from the ferromagnetism metallic iron was observed toresult.
The Cation Exchange Adsorption of Calcium and Strontium from an Ammonium Formate or Ammonium Acetate Solution in Mixtures of Organic Solvents and Water
Authors: Tsubota Hiroyuki 
Published: July 2006

Abstract
Ion exchange equilibria of calcium- and strontium-ammonium exchange systems have been studied in methanol-water, acetone-water and dioxane-water mixtures in which acetate or formate ions co-exist as a complexing anion. The selectivity coefficients of calcium against ammonium and those of strontium against ammonium decrease, while the separation factor between strontium and calcium increases, with an increase in the organic solvent concentration. Therefore, by the column operation, calcium can easily be eluted from the column, and strontium can be well separated from calcium when a suitable elutriant with a high separation factor between strontium and calcium and with a low selectivity coefficient of calcium against ammonium is selected. A 1 : 1 mixture of a 2 m ammonium formate aqueous solution and acetone or a 1 : 1 mixture of a 2 m ammonium acetate aqueous solution and methanol is recommended. When strontium in a large amount of calcium is to be analyzed, the latter elutriant is the most suitable.
The Synthesis of Four Isomeric Diiodo-m-xylenes. Their Isomerization in Sulfuric and Polyphosphoric Acids
Authors: Suzuki Hitomi , Maruyama Kazuhiro , Goto Ryozo 
Published: July 2006

Abstract
Four isomeric diiodo-m-xylenes have been synthesized and their isomerization in concentrated acids investigated in order to elucidate the mechanism of the new rearrangement observed in the Jacobsen reaction of 2-iodo-m-xylene. 2,4- and 4,5-Diiodo-m-xylene, in the presence of cold sulfuric or hot polyphosphoric acid, isomerize to 4,6- and 2,5-diiodo-m-xylene respectively. All four isomers readily undergo disproportionation with hot sulfuric acid to give mixtures of tri- and tetraiodo-m-xylenes. No disproportionation has been observed in the reaction with polyphosphoric acid. The important role played by a sulfo group in this reaction has been discussed.
An Attempt to Determine Fluorescein’s S–T Transition Probability and a Preliminary Investigation of the Behavior of Its Semiquinone in an Alkaline Solution
Authors: Momose Yoshihiro , Uchida Kengo , Koizumi Masao 
Published: July 2006

Abstract
An attempt to obtain a reliable value of \varphiS-T for fluorescein in an alkaline solution has been unsuccessful since the values for EDTA and ATU were quite different. It has been found that a large quantity of semiquinone is produced when EDTA is used as a reducing agent. In the case of ATU, the quantity of semiquinone produced is very small. Semiquinone in an alkaline solution reverts to the oxidized dye by the second-order thermal reaction and, quite astonishingly, mostly by the reaction 2DH → 2D+H2. The photochemical behavior of leuco-fluorescein has been investigated to some extent in the presence of and in the absence of a reducing agent.
Semi-empirical Self-consistent Field Molecular Orbital Calculation of the Electronic Structure of the Base Components of Nucleic Acids
Authors: Nagata Chikayoshi , Imamura Akira , Tagashira Yusaku , Kodama Masahiko 
Published: July 2006

Abstract
SCF MO calculations have been carried out for adenine, guanine, thymine, cytosine, uracil, 9-methyladenine and 1-methylthymine. In evaluating the two-center repulsion integral, the Pariser-Parr and Mataga-Nishimoto approximations have both been used, and the results compared with each other and with the experimental data on the optical properties. In the calculation of thymine, 9-methyladenine, and 1-methylthymine, the hyperconjugation of the methyl group has been taken into account. The calculated wavelength and the oscillator strength of the singlet-singlet transition for the above-mentioned molecules explain the experimental values well except for thymine and 1-methylthymine. The theoretically determined directions of the polarization of the transition moments have been compared with the experimental results for adenine, 9-methyladenine and 1-methylthymine. With regard to the direction of the polarization of the transition moments of the first and the second absorptions of adenine and 9-methyladenine, the results are questionable. From the theoretical point of view, it is difficult to determine which assignment is correct, however, in view of the wavelength and the oscillator strength, the first absorption may reasonably be assigned to the long-axis polarized band. The calculated and the experimentally-determined direction of polarization for 1-methylthymine agree well with each other. The energies of the highest and lowest vacant orbitals and the π-electron densities for the molecules treated in the present paper have been calculated and compared with the result obtained by the Hückel MO method.
Studies of the Aqueous Solution of a Surface Active Substance by Means of an Ultrasonic Interferometer. I. Determinations of the Critical Concentration and Compressibility of Micelles of Several Alkyl Sulfates
Authors: Shigehara Koji 
Published: July 2006

Abstract
The sound velocity and the density of aqueous solutions of sodium hydrogen (SHS), methyl (SMS), octyl (SOS), dodecyl (SDS) and tetradecyl (STS) sulfates have been measured by using, respectively, a differential ultrasonic interferometer and a float balance, and the compressibility (β) has then been calculated from these results. Each of these three quantities, when plotted against the concentration (C), has shown a nearly straight line for SHS and SMS, while it consists of two nearly straight lines, with a break point between them at CMC, in the cases of SOS, SDS and STS. The values of dβ/dC below and above CMC, when plotted against the number of carbon atoms in the alkyl chain of the solute molecule, again showed two straight lines which intersected with each other at the zero number of carbon atoms. This value of dβdC is equal to that of SHS at a moderate concentration. These results have been explained by taking account of the dissolved state of these solutes. The compressibility of the micelle (βm), the molar volume of the CH2 radical in the micellar state (Vm), and the ionic hydration number of solute have been calculated; the values of βm and Vm show evidence for the view that the hydrocarbon interior of the ionic micelle is liquid-like rather than solid-like.
Studies on the Liquid-Liquid Partition Systems. II. The Determination of Water Activity by the Solvent Extraction Technique
Authors: Hasegawa Yuko , Sekine Tatsuya 
Published: July 2006

Abstract
An attempt has been made to apply the solvent extraction technique to the determination of the water activity in various electrolyte solutions.
Benzene was agitated with a sample solution until the distribution equilibrium was attained, the water content in the benzene was then measured by Karl Fischer titration. The water activity was calculated on the basis of the water content.
The results agree with the data obtained by the vapor pressure method. On the basis of these, a solvent extraction procedure has been recommended as an easy and rapid method to determine the water activity in various electrolyte solutions.
Studies of Thio Acids. IV. Dipole Moments of Methyl Thiostearate, Thiostearic Acid and Thioacetic Acid
Authors: Hirabayashi Yoshio 
Published: July 2006

Abstract
The dipole moments of methyl thiostearate, thiostearic acid, and thioacetic acid have been measured in n-hexane, benzene, and dioxane solutions at 30°C. The values obtained are: methyl thiostearate, 1.30 D (n-hexane), 1.37 D (benzene), 1.37 D (dioxane); thiostearic acid, 2.06 D (n-hexane), 2.14 D (benzene), 2.21 D (dioxane); thioacetic acid, 2.12 D (n-hexane), 2.16 D (benzene), 2.36 D (dioxane). On the basis of the above results, a planar configuration similar to the cis configuration of carboxylic ester is considered to be the most probable structure of methyl thiostearate; three probable alternative configurations have been suggested for the structure of thio acid.