bluuebunny/crossref_metadata_2025_split huggingface dataset:
Indirect Complexometric Titration of Beryllium with Ethylenediaminetetraacetic Acid
Authors: Misumi Seizo , Taketatsu Tomitsugu 
Published: July 2006

Abstract
When Luteo salt was added to beryllium carbonate complex solution, the precipitate [Co(NH3)6] [(H2O)2Be2(CO3)2(OH)3]·3H2O was obtained. In this experiment, the indirect determination of beryllium was tried by the titration of the cobalt content in the precipitate with EDTA. The following procedures were examined mainly; the formation of the precipitate II, the decomposition of the precipitate and titration of cobalt in the presence of beryllium. In the optimum conditions, 0.70 to 3.50 mg. of beryllium were determined quantitatively. This method could be applied to separation and determination of beryllium from iron(III), aluminum and magnesium by using EDTA as a masking agent.
Preparation of Chloropolysilane from the Copper-catalyzed Reaction of Silicon Metal and Hydrogen Chloride
Authors: Shiihara Isao , Iyoda Jun 
Published: July 2006

Abstract
The copper catalyzed reaction of silicon metal powder with hydrogen chloride by flow method was studied in order to find a convenient preparative method of chloropolysilane, and also to elucidate the mechanism of this reaction.
This reaction was found to start at about 170∼230°C, and once the reaction occurred, the contact mass is activated and the reaction takes place even at 170°C. When the most adequate conditions were adopted, chloropolysilanes were obtained in the condensate as efficiently as 30 wt.% yield based on hydrogen chloride.
As to the mechanism of the reaction, it seems to be plausible that the first step of the reaction is an attack of hydrogen chloride on aluminum which is usually present in the commercial silicon metal. The second step is the reaction between silicon hydride, which is derived from the first step reaction upon the silicon contact mass and metallic copper forming the silicon-copper bonding. The third step is the cleavage reaction of copper-activated silicon by hydrogen chloride to produce chlorosilanes under the presence of aluminum chloride. The aluminum chloride is also derived from the first step reaction, and copper is regenerated in metal form which can circulate among the latter two reaction steps as long as the effective silicon component is present.
The Roles of Prolyl Residue in Polypeptide Monolayers. II. On the Surface Viscosity and Types of Monolayers
Authors: Ikeda Shoichi , Isemura Toshizo 
Published: July 2006

Abstract
To investigate the roles of prolyl residue in polypeptide monolayers, surface viscosity was measured for the monolayers of poly-Dl-alanine, poly-l-prolyl-l-leucylglycine and copoly-1:1:1-(l-proline, l-leucine, Dl-alanine).
For the monolayer of poly-Dl-alanine which is of condensed type, the surface viscosity was found to rise at the area larger than the close-packed area and scarcely to be dependent of temperature. This result was correlated with that observed in the glassy state of polymers in bulk and interpreted by assuming that the polypeptide chain is rigid owing to the strong interaction. For the films of the other two polypeptides which are of expanded type appreciable surface viscosities were manifested at the areas much smaller than their close-packed areas and temperature exerted marked influence on surface viscosities. Their chain configurations were considered to be flexible owing to the weak interaction, since the flows in films occur as in melt of polymers in bulk.
Further evidence for this inference was obtained from the results on dependences of surface viscosity on surface pressure and temperature. The dependences were found to follow Eyring’s equation of surface viscosity. It was found that in the monolayer of poly-Dl-alanine a unit of flow is roughly composed of a molecule and its chain is rather coiled at the interface, but the chains of the other two polypeptides are in a regularly folded configuration partly submerged into the aqueous phase when compressed, as they are flexible.
The difference in surface viscosity behavior between poly-Dl-alanine and the other two polypeptides was related to the condensed and expanded nature of films, which is defined by the content and distribution of prolyl residues in polypeptide chains. It was, however, observed that poly-l-prolyl-l-leucylglycine and copoly-1:1:1-(l-proline, l-leucine, Dl-alanine) exhibit the same surface viscosity behavior, irrespective of their different distribution of prolyl residues in chains, while the former has a higher surface pressure than the latter.
All the results obtained were found to confirm the view deduced from the surface pressure and potential measurements.
Role of Dielectric Constant at the Miscibility Point in the Ternary System 2-Propanol-Water and Carbon Tetrachloride
Authors: Suryanarayana C V , Somasundaram K M 
Published: July 2006

Abstract
To understand why a heterogeneous system of two immiscible liquids so exists without mixing we have made a new approach of studying the physical properties of the system just at the transition of the disappearance of the phase boundary after the addition of an optimum amount of a third component which is freely miscible with the two heterogeneous components thus resulting in the formation of a ternary system. At the transition of the disappearance of the phase boundary we have found that \underset3ΣL3x3=L1,2,3, wherein L represents volume polarization and x the mole fraction, holds good. The implications of the validity of the above equation have been discussed.
Stereoregular Polymers. II. Polymerization of Alkenyltrimethylsilanes with Ziegler Catalyst
Authors: Murahashi Shunsuke , Nozakura Shun’ichi , Sumi Masao 
Published: July 2006

Abstract
Vinyl-(I), allyl-(II), and 3-butenyl-trimethylsilane(III) were polymerized at 70°C in n-heptane with the heterogeneous catalyst of Ziegler’s type. The monomer I gave only a small yield of polymer, while the monomers II and III gave moderate amounts of polymers.
The amorphous and crystalline polymers of these monomers were separated by extraction with appropriate solvents. As regards the crystalline polymers, solubility property, density, dilatometrical melting point, and X-ray spectra were described. Glass transition temperatures of the amorphous polymers are also determined.
Formation and Aging of Precipitates. X. An Electron Micro-Diffraction Study on Crystal Habit of Barium Sulfate Precipitates
Authors: Takiyama Kazuyoshi 
Published: July 2006

Abstract
Barium sulfate precipitates in a form of rectangular perfect crystal from a solution of low initial concentration, and in a form of dendrite from a solution of higher initial concentration. They are platelets grown along (100) plane. The short- and long-axes of rectangular crystal are b- and c-axes respectively. The dendrite grows along b- and c-axes, or along the direction perpendicular to the plane of {011} group.
Absorption Spectra of Dyes. IV. Absorption Spectra of Mixtures of Chlorazol Sky Blue FF and Dyes Prepared from Sulfanilic Acid and Cresidine
Authors: Kobayashi Teruaki , Tanizaki Yoshié , Ando Noboru 
Published: July 2006

Abstract
1. The absorption spectra of the binary mixtures in aqueous solution of Chlorazol Sky Blue FF and sulfanilic acid → cresidine and sulfanilic acid → cresidine→ cresidine were measured at room temperature.
2. The mixture of Chlorazol Sky Blue FF and sulfanilic acid → cresidine shows the additive spectrum when the ratio of the two dyes is about 1:5 but the non-additive one when it is about 1:40. From this fact the authors pointed out that even if an equimolar or nearly equimolar mixture shows the additive spectrum, it often exhibits the additive one with a relative increase of one component, due to the interaction between the components. That the spectra of the mixture pass through an isosbestic point means that a Sky Blue molecule interacts with n molecules of sulfanilic acid → cresidine (n is unknown).
3. It was indicated that the mixture of Chlorazol Sky Blue FF and sulfanilic acid → cresidine→ cresidine showed the non-additive spectrum, and that this was well explained by assuming the formation of a 1:1 complex over the range of concentrations measured.
4. The authors discussed qualitatively the characters of the spectra and the stability of these complexes, comparing them with the complex of Sky Blue and Chrysophenine G, etc.
On the Mechanism of Oxidation by Cuprous Chloride, Pyridine and Air. III. On the Mechanism of Oxidative Cleavage of Benzil, α-Methyl Benzoin and Hydrobenzoin
Authors: Kinoshita Keiz\={o} 
Published: July 2006

Abstract
(1) Benzil is oxidized by aerial oxidation catalyzed by “oxidants A, B, C and D”.
(2) α-Methyl benzoin or hydrobenzoin is oxidized by aerial oxidation catalyzed by “oxidants A and B” only. This reaction is retarded by methyl alcohol.
(3) The mechanism of oxidative cleavage of benzil, α-methyl benzoin and hydrobenzoin, is described. It is also considered that the oxidative cleavage of benzil, α-methyl benzoin and hydrobenzoin, and the oxidative dimerisation of aniline are carried out through similar mechanism.
Recombination of Hydrogen Atoms on Various Transition Metal Surfaces
Authors: Nakada Kazuo 
Published: July 2006

Abstract
A study has been made of surface recombination of hydrogen atoms on various transition metals.
Hydrogen atoms were produced in the electric discharge tube by use of an alternating current. In order to prevent the reacting gas from reaching the undesired part of the sample, a method which may be called “an effusion method” was adopted here. The relative activity of two kinds of metal plates, stuck together by the solder or some such material, was determined, comparing the temperature rises of the sample by means of alternative exposure of each side surface to the reacting gas.
The following results were obtained:
a) Co&gt;Fe&gt;Ni&gt;Ta&gt;Mo&gt;W&gt;Ti&gt;Cr&gt;Mn&gt;Cu
b) Zr&gt;Ti&gt;Th
c) Mo&gt;U
These orders of activity were examined from several points of view through the comparison of recombination activity with the work function, the d-character, the experimental heat of chemisorption, etc.
The present results are still fragmentary but may suffice to show a qualitative trend.
The Kinetic Study of Surface-chemical Reactions at Extremely Low Pressures. II. The Thermal Reaction between Water Vapor and a Tungsten Filament. Part II
Authors: Hamamura Takuya 
Published: July 2006

Abstract
1) The end effect of filament upon the reaction probability was eliminated by means of the two-filament method. Its principle and procedure were described.
2) Reaction probabilities were determined at temperatures from 1430 to 1940°K and pressures of water vapor from 12×10−5 to 125×105 mmHg.
3) The reaction probability increased remarkably with the increase of temperature, but the rate of increase became smaller in the vicinity of 1700°K.
4) The order of reaction with respect to water vapor was found to lie between 0.60 and 0.86.
The Dissociation Constants of Carboxytropone and Carboxytropolones
Authors: Tanaka Nobuyuki , Oiwa I T , Kurosawa Toshiko , Nozoe Tetsuo 
Published: July 2006

Abstract
The thermodynamic dissociation constants of 2-carboxytropone, 3-carboxytropolone, 4-carboxytropolone, 5-carboxytropolone, 3-carboxy-4-methyltropolone, 3-carboxymethyltropolone, 3,4-dicarboxytropolone and 3-carboxy-4-carboxymethyltropolone have been determined by means of the pH titration with a glass electrode.
The relationships between the magnitudes of the dissociation constants and the structures of these compounds have been discussed.
The Reaction of the Aquopentamminechromium(III) Complex Ion in Aqueous Solution. I. Substitution Reaction of a Coordinated Water with a Chloride Ion
Authors: Hashimoto Shinpei 
Published: July 2006

Abstract
The substitution reaction of aquopentamminechromium(III) ion in which a coordinated water molecule is replaced by a chloride ion was investigated spectrophotometrically. The reaction proceeds according to the second order rate law, d[[Cr(NH3)5Cl]2+]/dt=\overrightarrowk2[[Cr(NH3)5OH2]3+]. [Cl−], and the rate constant varies regularly with the ionic strength of solution according to the Debye-Hückel type equation. The formation of outer sphere association complex in the solution was detected from the change in ultraviolet absorption. From these results the ratedetermining process of this reaction was inferred to be a unimolecular process through the outer sphere association complex. The experimental activation energy and the frequency factor of this reaction were determined to be 24.6 kcal.mol−1 and 1.2×1014l. mol−1min−1 (ω∼0.52), respectively.
The aquation of chloropentamminechromium(III) ion was also studied in the solutions of various ionic strengths and the reaction rate was found to vary to some extent with ionic environment.
Investigation on Mixed Complexes. II. Cyano Complexes of Copper and Nickel
Authors: Kida Sigeo 
Published: July 2006

Abstract
1. Mixed amino-cyano nickel(II) complexes, such as [Ni en2(CN)2], [Nien·(CN4)4]−2 and [Ni en(CN)2] in the solution containing the divalent nickel ion, ethylene-diamine and cyanide ion, are not formed.
2. In the solution containing the divalent or the monovalent copper ion, ethylene-diamine and the cyanide ion, no mixed amine-cyano copper(I) and copper(II) complexes are formed, except the copper-(II) complex of coordination number 5.
3. Among cyano copper(I) complexes, tricyano copper(I) ion is the most stable, and its coordination number may be 3.
Visible and Ultraviolet Absorption Spectra of Red Complexes of 1,3,5-Trinitrobenzene and its Derivatives with Ammonium Hydroxide
Authors: Abe Takehiro 
Published: July 2006

Abstract
The red complexes of trinitrobenzene, trinitrotoluene, tetryl and picryl chloride with ammonium hydroxide, regarded as intermediates in aromatic substitutions, were obtained. Each of these red complexes roughly shows a similar spectrum both in water and in ethanol. All their visible bands, however, shift to the red and have greater molar absorbancies in ethanol as compared with those in water. The red complex of trinitrobenzene shows an absorption curve analogous to that for the complex of tetryl, although they yield different products after further reactions. As the concentration of sodium hydroxide increases, the molar absorbancy for the spectrum of the red complex of trinitrtoluene decreases in water, probably owing to the action of OH−.
Application of the Theory of Regular Solutions to Binary Phase Equilibria. II. Dependency of the Interchange Energy upon Temperature
Authors: Ishida Kiyoharu 
Published: July 2006

Abstract
Theoretical expressions for estimating the interchange energy w were given in such form as to be obtained from the mutual solubility data. It has been found that the dependency of the interchange energy estimated from mutual solubility data in terms of \varphi-fractions upon temperature is satisfactorily expressed by the form of equations w⁄kT–(w⁄kT)c=K(|Tc⁄T–1|)n. The method of predicting the critical solution point was described as an example of the application of the theory of regular solutions.
The Assignment of Infrared Absorption Bands of p-Dichlorobenzene
Authors: Saëki Shinnosuke 
Published: July 2006

Abstract
The infrared absorption spectra of deuterated and non-deuterated p-dichlorobenzene were measured in the vapor state using a high temperature cell. The results obtained by the measurement permitted us the assignment of the observed fundamental bands with the aid of the product rule. For some frequencies which we could not measure under our experimental conditions, we used the frequencies observed by other workers in the solid state which enabled us to apply the product rule.
Studies on Antibiotics and Related Substances. X. Syntheses of Some Unsaturated Ketocarboxylic Acids, Anti-tumor Substances
Authors: Kinoshita Mitsuhiro , Umezawa Sumio 
Published: July 2006

Abstract
1) 2-(Dimethylaminomethyl)-3-ketobutane-1-carboxylic acid hydrochloride (VI) as well as 5-dimethylamino-3-ketopentane-1-carboxylic acid hydrochloride (I) has been obtained from levulinic acid, paraformaldehyde and dimethylamine hydrochloride by means of the Mannich reaction. Thermal degradation of I and VI afforded δ-methylenelevulinic acid (IV) and β-methylenelevulinic acid (VII), respectively.
2) 3-(Dimethylaminomethyl)-4-ketopentane-1-carboxylic acid hydrochloride (XII) as well as 6-dimethylamino-4-ketohexane-1-carboxylie acid hydrochloride (VIII) has been obtained from 5-ketocaproic acid, paraformaldehyde and dimethylamine hydrochloride by means of the Mannich reaction. Thermal degradation of XII and VIII afforded 4-keto-5-hexene-1-carboxylic acid (XI) and 4-keto-3-methylene-pentane-1-carboxylie acid (XIII), respectively.
3) The structures of IV, VII, XI and XIII have been proven.
4) Some derivatives of above-mentioned carboxylic acids have been described.
5) It has been found that IV, VII, XI and XIII possess significant antitumor and antibacterial activites; especially calcium salt of 4-keto-5-hexene-1-carboxylic acid (XI) gave an excellent result in animal experiments.
Effect of Compacting and Grinding on the Hydrogen Reduction of Nickel Oxide
Authors: Iida Yoshio , Shimada Kenzo 
Published: July 2006

Abstract
The rate of hydrogen reduction of nickel oxide increases with an increase in the compacting pressure although the bulk density of nickel oxide increases and the surface area does not vary with the pressure. The rate of reduction of nickel oxide which is prepared by the grinding of a single crystal and has a large particle size of 50 μ is higher than that of nickel oxide which is prepared by ignition of nickel sulfate and has small particle size of 0.5 μ. It seems reasonable to conclude that the accelerated reduction is attributed to the crystal distortion which may result from plastic deformation by grinding or compacting.
Polymerization of Methyl Methacrylate Initiated by N-Nitrosophenylurea
Authors: Uehara Ryoichi 
Published: July 2006

Abstract
N-Nitrosophenylurea is an efficient initiator of the polymerization of methyl methacrylate. The initial rate of polymerization of methyl methacrylate was linearly dependent upon the concentration of methyl methacrylate and the square root of the concentration of N-nitrosophenylurea. These facts suggest that the polymerization is initiated by radicals which are produced through a unimolecular first order decomposition of N-nitrosophenylurea.
Spectrochemical Study of Microscopic Crystals. XXII. The Structure of Cupric Mono-, Di- and Trichloroacetate
Authors: Yamada Shoichiro , Nishikawa Hiroaki , Tsuchida Ryutaro 
Published: July 2006

Abstract
In order to examine the structure of cupric chloroacetates, the dichroism in the visible and the ultraviolet region has been determined at room temperature by the microscopic method with mono-, di- and trichloroacetate. Visible and ultraviolet absorption spectra have also been determined with the above compounds in organic solvents.
The monochloroacetate consists of the binuclear molecules of the acetate-type in the crystalline state and in solution. It has been found that there is another form of the anhydrous monochloroacetate, which is colored blue and contains no binuclear molecule.
The dichloroacetate exists as binuclear molecules in ethyl ether and dioxane, but as mononuclear complexes in ethanol. The anhydrous dichloroacetate in the crystalline state consists of binuclear molecules of the acetate-type.
The trichloroacetate exists as mononuclear complexes in ethanol and in dioxane, and in the crystalline state. The compound exists as binuclear molecules in ethyl ether. Crystals of another form have also been obtained. These possibly consist of binuclear molecules.
Investigation on Mixed Complexes. V. A Conductometric Study of Cyano-ethylenediamine Complexes
Authors: Kida Sigeo 
Published: July 2006

Abstract
The conductometric method was applied to the determination of the formation of mixed complexes in solution, using the method of continuous variation. It was shown that
1) [Ni en3]2+ reacts with CN− and forms [Ni(CN)4]2− only, leading to the same conclusion as in the spectrophotometric investigation carried out previously.
2) [Pt en2]2+ forms only a tetracyano complex, but no mixed dicyano complex.
3) [Pd en2]2+, [Zn en3]2+ and [Cd en3]2+ form dicyano-ethylenediamine complexes in solution.
The Formation Constants of Metal Acetate Complexes. III. Polarographic Determination of the Formation Constants of Acetatocadmium(II) and Acetatocobalt(II) Complexes
Authors: Tanaka Nobuyuki , Kamada Minoru , Osawa Hisao , Satô Gen 
Published: July 2006

Abstract
The formation constants of acetatocadmium-(II) and acetatocobalt(II) complexes were determined at ionic strength of 0.2 at 15, 25 and 35°C with the procedure that is based on the polarographic measurement of the sum of the equilibrium concentrations of the hydrated metal ions and the metal acetate complexes in the substitution reaction involving EDTA complexes. The resulting formation constants KCdOAc and KCoOAc are 27 and 2.1 at 15°C, 16 and 0.6 at 25°C and 20 and 0.6 at 35°C, respectively.
Infrared Spectrum of Some Deuterated Crystalline Polystyrenes. I. Isotactic Poly-αd1-styrene
Authors: Kobayashi Masamichi 
Published: July 2006

Abstract
In Table I are given the results of discussions described above on the assignments of the absorption bands.
The bands characteristic to the isotactic polymers, i.e. the bands appearing in the region of 1400∼1180cm−1 or in the vicinity of 1070 and 900cm−1, are proved as associated with the CH2 and CH groups.
To make assignments of the bands more precisely, the studies are in progress on the infrared spectra of the other several deuterated derivatives, such as poly-βd1-, poly-α,βd2 and poly-β,β d2 styrenes.
Neutron Activation Analysis of Halogens in High-Purity Silicon
Authors: Nozaki Tadashi , Kawashima Toshi , Baba Hideo , Araki Hidemaro 
Published: July 2006

Abstract
A trace quantity of chlorine, bromine and iodine was determined simultaneously by neutron activation analysis. By careful distillation of a solution containing the alkali-fused silicon, chromium(VI) oxide and sulfuric acid, bromine and chlorine were distilled out separately, leaving iodine in the residual solution, which was then distilled out after adding oxalic acid.
Most kinds of high-purity silicon contained more than 0.1 ppm of a halogen, which was used in the course of its purification process, and also two other halogens, though of a smaller quantity.
Distribution of Unpaired π-Electron in Some Semiquinone Ions
Authors: Matsunaga Yoshio 
Published: July 2006

Abstract
The distribution of unpaired π-electron was calculated by the simple MO method using the proposed parameters αo=α+(1/2)β and α+(2/3)β for six semiquinone ions. The calculated splitting constants for the ring protons in p-benzo- and naphtho-semiquinone ions were found in good agreement with the experimental ones and the MO treatment with the proposed parameters seemed to be very helpful to the analysis of the hfs of ESR spectra of anthra-and bipheno-semiquinone ions. In the case of o-semiquinone ion, a much higher value of αo was required to obtain quantitative agreement. The assignment of splitting constants was attempted for the semiquinone ion from nin-hydrin. It was found that the simple MO method fails to predict the symmetry of the singly occupied MO in the semiquinone ion formed on reduction of dihydroxy-p-benzo-quinone. In addition the ESR spectra of the semiquinone ions from methyl- and hydroxy-naphthoquinones etc. were described.