bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polarography of Dialkylthallium(III) Compounds. I. Polarography of Dibutylthallium(III) Compounds
Authors: Murayama Teisuke , Kikuchi Kenji 
Published: July 2006

Abstract
Electrochemical reduction of three dibutylthallium(III) cations has been studied through the use of polarographic methods. Reduction at a dropping mercury electrode occurs in two steps for the di-n-butylthallium (DNBT) and diisobutylthallium (DIBT) cations in alkaline solutions, and for the di-sec-butylthallium (DSBT) cation in all pH ranges examined. The first and second waves of the DSBT cation in alkaline solutions correspond to, respectively, no-proton one-electron and two-proton two-electron processes. The DNBT and DIBT cations produce a single wave in acid solutions, consuming two protons and three electrons. On polarograms recorded with Kalousek’s switching circuit a product and two kinds of intermediates were observed for the reduction of the DNBT and DIBT cations, and a product and one kind of intermediate for the reduction of the DSBT cation. A reaction scheme is proposed for the polarographic reduction of dibutylthallium cations.
The T←S0 Absorption of the Acetophenone Crystal
Authors: Tanimoto Yoshifumi , Azumi Tohru , Nagakura Saburo 
Published: July 2006

Abstract
The polarization and Zeeman splitting of the T←S0 absorption were measured with the acetophenone single crystal at 4.2 K. From the analyses of the polarization behavior and the Zeeman splitting pattern, it is concluded that the 26110 cm−1 band is in-plane polarized and has the character of the n,π* type transition.
The Quenching of the Cadmium Resonance Radiation at 326.1 nm by Some Aliphatic Amines and the Cadmium-sensitized Luminescence of These Amines
Authors: Yamamoto Shunzo , Sato Shin 
Published: July 2006

Abstract
From the pressure dependence of the intensity of the 326.1 nm resonance line, the efficiencies of the quenching of the resonance line by methylamine, ethylamine, n-propylamine, n-butylamine, sec-butylamine, tert-butylamine, diethylamine, and triethylamine were estimated to be 14.2, 36.0, 58.6, 71.2, 116.7, 434.5, 69.6, and 66.0 respectively, the efficiency of ammonia being assumed to be unity. The relative values of rate constants for the formation of excited complexes between the excited cadmium atoms and the amines, and the wavelengths at the peaks of the emission bands from the complexes, were measured. The quantum yields of luminescence were also measured by comparing the integrated intensities of the emission bands with the decrease in the intensities of the resonance line at 326.1 nm upon the addition of amines. From the relationship between these values and the structure of the amines, it is concluded that the complexes are of the charge-transfer type.
Resonance Raman Spectra of Methylorange Bound to Proteins and Cationic Surfactants
Authors: Kim Bak-Kwang , Kagayama Akira , Saito Yutaka , Machida Katsunosuke , Uno Toyozo 
Published: July 2006

Abstract
Resonance Raman spectra of methylorange were recorded for aqueous solutions containing various proteins and cationic surfactants. The base form of methylorange was found to retain its trans-azo structure on the interaction with human serum albumin and with cetyltrimethylammonium bromide. The relative intensities of the Raman bands at 1420 cm−1 and at 1155 cm−1 of methylorange change appreciably along with the shift of the absorption maximum in the visible and ultraviolet region on addition of proteins and surfactants.
Studies of Aqueous Sodium Dodecyl Sulfate Solutions by Activity Measurements
Authors: Sasaki Tsunetaka , Hattori Michihiro , Sasaki Jun , Nukina Kenji 
Published: July 2006

Abstract
The activities of surfactant ions (aD) and counterions (aNa) were directly obtained by the EMF measurement of a concentration cell with an ion-exchange membrane and by pNa measurements respectively for aqueous solutions of sodium dodecyl sulfate (NaDS) below and above the CMC. The mean activity and activity coefficient were also calculated. From these data, together with the surface tension (γ) measured by the Wilhelmy method and the amount of adsorption (Γ) measured by the radiotracer method, the following results were obtained: (1) Mean activity was not constant, but increased with the concentration above the CMC. (2) The Gibbs adsorption isotherm was directly verified from the aD and aNa vs. concentration relations. (3) The decrease in γ observed above the CMC was in agreement with that calculated from the activity data. (4) The logaD vs. logaNa plots above the CMC showed a linear relation, indicating the validity of the charged phase separation model as the mechanism of micelle formation. The degree of the counterion attachment of the micelles was found to be 0.73 up to about 80 mmol/l. (5) The intermicellar concentrations of Na+ and DS− ions were calculated; the former increases, while the latter decreases with the concentration. (6) The product of the concentration with an osmotic coefficient was linear with the concentration above the CMC, tangent of the slope being about 0.7.
The Specific Refractive Index Increment and the Partial Specific Volume of Atactic Poly (2-vinylpyridine)
Authors: Arichi Shizuo , Yoshida Masafumi , Ogawa Yoshihiro 
Published: July 2006

Abstract
The specific refractive index increment, dn⁄dc, of atactic poly(2-vinylpyridine) was measured in 18 solvents with 436 nm light at 25 °C. Using these data, the partial specific volume, \barν2, of the polymer in these solvents was then evaluated by means of the method proposed by Heller. A sufficient agreement was found between the values of \barν2 thus obtained optically and those determined directly by the density measurement of solutions in several solvents. It was found that \barν2 varies considerably with the kind of solvent and that, in some solvents, such as methanol and ethanol, it takes an extremely lower value than that of bulk crystalline isotactic poly(2-vinylpyridine). The results were discussed in terms of thermodynamic interactions between the polymer and the solvent, the molar volume, and the compressibility of the solvent molecule. The relationship between dn⁄dc and the refractive index of a solvent, n1 for 436 nm light is expressed by dn⁄dc=0.900× (1.628–n1).
Studies on Mass Spectrometry of Metal Chelates. IV. Synthesis and Mass Spectrometry of Cobalt(III) Mixed Ligand Chelates
Authors: Kidani Yoshinori , Naga Shinobu , Koike Hisashi 
Published: July 2006

Abstract
The ligand substitution reaction of Co(acac)3 proceeded with other ligands L (L=oxine, 2-Me-oxine, 4-Me-oxine, 5-Me-oxine, and 7-Me-oxine), to afford mixed ligand chelates, Co(acac)2(L) and Co(acac)(L)2. Their mass spectra gave the following fragmentation patterns. The Co(acac)2(L) type chelate gave a fragment ion Co(acac)(L), produced by the loss of one molecule of acac from the molecular ion. At the same time it produced another fragment ion, Co(acac)2, by the loss of L from the molecular ion. From this fragmentation pattern it was confirmed that the compound is a mixed ligand chelate having the binding ratio Co: acac: L=1: 2: 1. The Co(acac)(L)2 type chelate produced a fragment ion, Co(acac)(L), by the loss of one molecule of L from the molecular ion, and another fragment ion of Co(L)2 by the loss of acac from the molecular ion. From this fragmentation pattern it was confirmed that the compound is another mixed ligand chelate having the binding ratio Co: acac: L=1: 1: 2.
Electrical Properties of TeO2. I.
Authors: Doi Kazuo , Sasaki Tomoaki , Hijikata Kenzo 
Published: July 2006

Abstract
The electrical conductivity a of polycrystalline tellurium dioxide (paratellurite; purity: 6-nine) was measured as a function of the oxygen partial pressure (1–760 mmHg) at temperatures between 475 and 550°C. The relations between the experimental values of logσ and 1⁄T were well represented by straight lines, giving the apparent activation energy of about 1.36 eV. The oxygen-pressure dependence of the isothermal conductivity was well expressed by the σ∝Po21⁄6 relation; this may be interpreted by assuming that electron holes with fullyionized oxygen interstitials predominantly act as charge carriers. The p-type behavior in the conduction process was also confirmed by thermal emf measurements.
Studies on Electrode Processes of Oxovanadium(IV). I. Polarographic Behaviors and Photochemical Reaction in Potassium Oxalate Solution
Authors: Kitamura Mitsutaka , Imai Hideo 
Published: July 2006

Abstract
Oxovanadium(IV) was found to develop a fairly stable oxidation wave as well as a reduction wave at the dropping mercury electrode in an aqueous solution containing M potassium oxalate. The predominant entity in the solution was [VO(ox)2]2− , and both the oxidation wave with one-electron transfer, and the reduction wave with two-electron transfer were irreversible. The anodic transfer coefficient evaluated from the logarithmic plot and Tafel plot was 0.60–0.63, and the exchange current density estimated tentatively from the Tafel plot was 1.8×10−6 A/cm2. The effect of aerial oxidation of V(IV) to V(V) and the photochemical reduction of V(V) to V(IV) were investigated through the controlled potential electrolysis, absorption spectroscopy and ESR studies. The polarographic kinetic current of the oxidation process was observed under ultra-violet light irradiation. The apparent rate constant of the photochemical reduction evaluated from the kinetic current was (0.02–0.04)/εφI0s−1, where ε is the molecular extinction coefficient, φ the quantum yield and I0 the intensity of the incident light.
The Reactions of Tetrafluorobenzyne with Carboxylic Acids in Cyclic Ethers
Authors: Hayashi Sei-ichi , Ishikawa Nobuo 
Published: July 2006

Abstract
The reactions between tetrafluorobenzyne generated from tetrafluorobenzenediazonium-2-carboxylate and several carboxylic acids in cyclic ethers, such as THF and dioxane, were carried out. During these reactions, the cyclic ethers were cleaved and participated in the reactions to give acetate, benzoate, and salicylate esters of 4-(2′,3′,4′,5′-tetrafluorophenoxy)butanol and 2-[2′-(2″,3″,4″,5″-tetrafluorophenoxy)ethoxy]ethanol.
Reactivity of Electrogenerated Superoxide Ion. I. Autoxidation of 9,10-Dihydroanthracene
Authors: Tezuka Meguru , Ohkatsu Yasukazu , Osa Tetsuo 
Published: July 2006

Abstract
The superoxide ion, which was generated by means of electroreduction of the oxygen molecule dissolved in pyridine, abstracted the labile hydrogen from 9,10-dihydroanthracene and yielded anthraquinone and anthracene as the final products. From the products and their kinetics, the reaction was proposed to be a radical-chain autoxidation. Reactions with some other hydrocarbons were also carried out. The addition of ferrous or cobaltous phthalocyanine to the reaction system resulted in the increase of the reaction rate. A discussion of the effects led to the postulation of the intermediate formation of the superoxide ion-metal phthalocyanine complex.
Reduction of Nitro and Nitroso Compounds with Tetracarbonylhydridoferrate
Authors: Watanabe Yoshihisa , Mitsudo Take-aki , Yamashita Masakazu , Takegami Yoshinobu 
Published: July 2006

Abstract
An applicability of potassium tetracarbonylhydridoferrate as a reducing reagent to synthesis of primary amines from a wide variety of nitro and nitroso compounds has been examined. The reaction proceeds vigorously and exothermally at room temperature to give the corresponding amines in excellent yields. For nitroaryls, some substituents have interfering effect on the formation of amines. o-Nitrocinnamic aldehyde gives quinoline.
A Genferal Method for Evaluating the Resonance Energies of Monocyclic Conjugated Systems and Its Application to Heteroannulenes and Annulenones
Authors: Aihara Jun-ichi 
Published: July 2006

Abstract
The unit binding energy of a monocyclic conjugated system with an infinite number of the same unit structures can be employed as the reference energy in evaluating the resonance energy of a monocyclic conjugated system with a single unit structure. The latter system may be totally asymmetric in geometry. The resonance energy is then given as the difference between the π-energy of the system with the one-unit structure and the unit binding energy of the infinitely large system. This approach is justified by the proper prediction of the resonance energies for heteroannulenes and annulenones. The HMO theory was used in its simplest form.
Charge-Transfer Complexes of Thiopyrylium Cation with Aromatic Hydrocarbons and Olefins
Authors: Yoshida Zen-ichi , Sugimoto Toyonari , Yoneda Shigeo 
Published: July 2006

Abstract
Charge-transfer (CT) interaction of the thiopyrylium cation (1) with aromatic hydrocarbons and olefins has been investigated by electronic spectroscopy. It is noteworthy that 1 formed a CT complex with a monoolefin. The observed CT spectra in the 1–olefin system showed the following remarkable contrasts compared with those in the 1-aromatic system. 1) Although one CT absorption band was observed for the 1–aromatic hydrocarbon CT complex, while two CT absorption bands for the 1–olefin CT complex, and 2) the value of a in the equation of ΔECT=aIPD+b was 1.04 for the former complex and 0.27 for the latter complex. A detailed discussion on the difference between the two CT complexes is presented.
Synthetic Studies on Phosphorylating Reagent. I. The Phosphorylation of Alcohols by Means of N-[2-(Dihydrogen phosphoroxy)5-nitrobenzyl]pyridinium Hydroxide
Authors: Taguchi Yoshihiko , Mushika Yoshitaka , Yoneda Naoto 
Published: July 2006

Abstract
The phosphorylation of alcohols by means of N-[2-(dihydrogen phosphoroxy)-5-nitrobenzyl]pyridinium hydroxide (3), which was prepared from 2-(chloromethyl)-4-nitrophenyl phosphorodichloridate (1) through two steps, was demonstrated. Alcohol with a tertiary amino group in its alkyl moiety was readily phosphorylated with 3 to afford the aminoalkyl dihydrogen phosphate in good yield. On the other hand, the phosphorylation of the usual neutral alcohol proceeded only in the presence of a strong base such as triethylamine to give the corresponding alkyl dihydrogen phosphate (9). Thus, several alkyl dihydrogen phosphates 9 were prepared. In this phosphorylation, the formation of alkyl 2-hydroxy-5-nitrobenzyl ether (10) was also observed.
Inositol Derivatives. 9. Lithium Aluminum Hydride Reduction of Inositol Epoxides and Their Sulfonates
Authors: Suami Tetsuo , Ogawa Seiichiro , Funaki Yuji 
Published: July 2006

Abstract
The reduction of two dianhydroinositols: 1,2:3,4-dianhydro-5,6-O-cyclohexylidene-allo-inositol (1) and 1,2: 5,6-dianhydro-3,4-O-cyclohexylidene-allo-inositol (2), and four sulfonylated anhydroinositols: 1,2-anhydro-5,6-O-cyclohexylidene-3,4-di-O-mesyl-chiro-inositol (5b), 1,2-anhydro-5,6-O-cyclohexylidene-3,4-di-O-tosyl-chiro-inositol (5c), 1,2-anhydro-5,6-O-cyclohexylidene-4-O-tosyl-neo-inositol (6) and 2,3-anhydro-4,5-O-cyclohexylidene-1,6-di-O-mesyl-epi-inositol (8), with lithium aluminum hydride has been investigated.
N-Alkylideneanilines. IV. Kinetics and Mechanism for Site-Exchange of the Methyl Groups in N-Isopropylideneanilines
Authors: Iwamura Hiizu , Tsuchimoto Michiko , Nishimura Shigeo 
Published: July 2006

Abstract
The kinetics of the site-exchange of the methyl groups in twelve N-isopropylideneanilines have been studied by the coalescence point analysis of their proton NMR spectra. The free energies of activation at the coalescence temperature were found to be in the range 16.5 (at 53.5 °C for p-nitro) ∼22.4 (at 161 °C for p-amino derivative) kcal/mol. They give a Hammett σ−ρ plot with ρ=2.83 (r=0.976). The results are interpreted in terms of an in-plane inversion about the imine nitrogen for the site-exchange. Noticeable deviation of the points representing p-chloro and p-bromo compounds from the linearity indicates the destabilization of the transition state by the electron-releasing resonance effect of the substituents and is consistent with the inversion mechanism.
The Thermal Reaction of 3-Formylguaiazulene
Authors: Kurokawa Shinji , Safo Teruyo , Noguchi Toru , Yano Katsumi 
Published: July 2006

Abstract
When 3-formxlguaiazulene was heated at 200 °C for 1 hr, three new compounds were isolated in addition to S-guaiazulene (formed by loss of the formyl group). They were shown to be 2-formylguaiazulene, produced by migration of the formyl group, and dimers produced from two molecules of the starting material through dehydration between the formyl and the aromatic methyl groups. The observed elimination or migration of the formyl group was analogous to the behavior of 3-acylguaiazulenes which had been studied earlier. On the other hand, the extent of the loss of the acyl group and the formation of the dimers was peculiar to this substance. Moreover, migration of the formyl group was not reversible at 200 °C, but was at 250 °C.
The Segregation of Sodium Ions in KCl Minute Crystals
Authors: Sensui Yoshihiro , Tomura Kenji 
Published: July 2006

Abstract
The surface accumulation of solute sodium ions in KCl crystallites was measured as a function of the annealing temperature, 250–450 °C. The minute crystals were baked out under 3×10−7 Torr, and their surface layers were dissolved successively with anhydrous ethyl alcohol. The contents of sodium and potassium were determined by instrumental neutron-activation analysis with the aid of a 50 cc-Ge(Li)-4K gamma spectrometer.
Infrared Spectra and Structures of Copper(II) and Zinc(II) Complexes of Glycylglycine in Aqueous Solution
Authors: Tasumi Mitsuo , Takahashi Seizo , Nakata Toshio , Miyazawa Tatsuo 
Published: July 2006

Abstract
The infrared spectra of the Cu(II) and Zn(II) complexes of glycylglycine were observed in D2O at various pD values. Large spectral changes in going from acidic to neutral solution were interpreted in terms of the equilibria among free and complexed forms of glycylglycine. In the Cu(II) complex formed for 3&lt;pD&lt;5 the metal-ligand bonding occurs through the amino nitrogen and peptide oxygen. As pD is increased further, the structure of the Cu(II) complex changes into a form in which the metal-ligand bonding occurs through the amino nitrogen, peptide nitrogen (deprotonated), and carboxyl oxygen. In contrast to the Cu(II) complex, no change of structure is found for the Zn(II) complex. The Zn(II) complex formed for pD&gt;5 is similar to the Cu(II) complex present for 3&lt;pD&lt;5.
Crystal and Molecular Structure of (π-C5H5)Fe3(CO)7C2C6H5 Obtained from (π-C5H5)Fe(CO)2C≡CC6H5 with Fe2(CO)9
Authors: Yasufuku Katsutoshi , Aoki Katsuyuki , Yamazaki Hiroshi 
Published: July 2006

Abstract
The crystal structure of π-C5H5Fe3(CO)2(C2C6H5) obtained from the reaction of π-C5H5Fe(CO)2C2C6H5 with Fe2(CO)9 has been determined from single crystal X-ray diffraction data. The space group is P\bar1 and the cell constants are a=12.635, b=9.457, c=9.033 Å, α=94.64, β=109.10, and γ=99.60°, and Z=2. The refinement was carried out using block-diagonal least-squares calculation including anisotropic thermal factors for the nonhydrogen atoms and isotropic thermal factors for the hydrogens. The final R value for 2488 reflections is 0.035. The molecular configuration consists of an isosceles triangle of the three iron atoms, each two of which bonds to three terminal carbonyl groups and one bonds to the cyclopentadienyl ring. The phenylethynyl group is disposed above the iron plane and is σ-bonded to one iron atom with three carbonyls and α-bonded symmetrically to the other two iron atoms. The seventh carbonyl group is bridged asymmetrically between these two iron atoms, below the iron plane. The characteristic shortening in the Fe–C σ-bond and in the acetylenic C–C bond was observed.
Preparation of Reinforcing Fillers from Japanese Acid Clays with Lime and by Calcination. III. Elucidation of the Reinforcing Effects Based on the Investigation of Changes in the Structure, Physicochemical Properties and Morphology of N Hard Clay
Authors: Rai Hideki , Yamada Junkichi 
Published: July 2006

Abstract
In order to elucidate the reinforcing effects of the fillers prepared from Japanese acid clay with hydrated lime and by calcination and mechanical disintegration, N hard clay (CaO 3–60%; calcination 400–800 °C, 1–1.5 hr; wet ball-milling 18 hr) derived from Nakajo acid clay (N) were investigated on the structure, physicochemical properties and morphology in comparison with those of N, Dixie Clay and Silene EF. X-Ray diffraction, infrared spectroscopy and electron micrography were applied to the examination of the structural and morphological features. The physicochemical properties were determined on the surface properties such as hygroscopicity, pH and DPG adsorption together with the specific gravity and bulk density. The following results were obtained: (1) Treatment under the optimum conditions (CaO 6%, calcination 600 °C, 1.5 hr; wet milling 18 hr) caused a favorable change in the structure of the prepared filler, resulting in controlling the surface properties, reduction in the particle size and its distribution, a decrease in the specific gravity and an increase in the bulk density. (2) Deviation from the conditions, e.g., calcination at 400 °C for 1.5 hr remained too much residual adsorptivity to improve the great surface activity of N, whereas treatment at 800 °C for 1–1.5 hr afforded sintering, collapse and/or fusion yielding too hard aggregates to be disintegrated as well as a serious breakdown or complete loss in the effective functional groups involved.
The Radiation-induced Dehalogenation of Dichloromethane and Dibromomethane in Methanol Solutions
Authors: Ogura Hajime , Fujimura Takashi , Unnai Takaaki , Kondo Masaharu 
Published: July 2006

Abstract
The scheme of the radiation-induced dehalogenation of dichloromethane and dibromomethane was investigated in deaerated methanol. The relative rate constants of those solutes toward esol− were determined by competition kinetics, using a N2O scavenger.
ENDOR Studies on the Hindered Alkylbiphenyl Anion Radicals
Authors: Ishizu Kazuhiko , Nemoto Fujito , Mukai Kazuo , Kohno Masahiro , Hasegawa Hideo 
Published: July 2006

Abstract
ENDOR observations were carried out for the anion radicals of 2,2′-bitolyl, 2,2′-diethylbiphenyl, and 2,2′-diisopropylbiphenyl. The spin densities obtained from the ring protons at the ortho-positions showed a depression in the order of the spherical bulkiness of the substituents, and the degrees of the steric hindrance of the biphenyl ring were estimated based on McLachlan’s MO calculation. ENDOR experiments demonstrated that methyl groups undergo free rotation, but it is greatly hindered in each higher alkyl derivative.
A Gel-state Liquid-membrane Iodide-ion Electrode
Authors: Shijo Yoshio 
Published: July 2006

Abstract
A new liquid-membrane iodide-ion electrode has been developed. The liquid membrane of the electrode consists of poly vinyl chloride gel containing a nitrobenzene solution of tridodecylethylammonium iodide as an ion exchanger, a lead wire is inserted directly into the gel. The properties of the electrode, such as the response time, the effect of the temperature, the reproducibility of the preparation, and the selectivity, have been determined.
The Magnetic Susceptibility of Two Coupled Dimers Consisting of S=1/2 Spins
Authors: Emori Shuji , Tokii Tadashi , Muto Yoneichiro 
Published: July 2006

Abstract
Tetramers consisting of two coupled dimers were classified as (a) linear, (b) cyclic, (c) rhombic, or (d) tetrahedral. The magnetic susceptibility for each tetramer model consisting of S=1/2 spins was obtained as an analytical equation. For the linear tetramer, the susceptibility equation was calculated numerically and compared with the observed values.
Circular Dichroism Spectra of (Aminocarboxylato)ammine[1,1,1-tris(aminomethyl)ethane]cobalt(III) (2+) Complexes
Authors: Yamanari Kazuaki , Hidaka Jinsai , Shimura Yoichi 
Published: July 2006

Abstract
Five triple mixed Co(III) complexes with one 1,1,1-tris(aminomethyl)ethane and one aminocarboxylato and one ammine ligand were prepared. The glycinato complex was optically resolved and three l-aminocarboxylato complexes were chromatographically separated into their diastereomers. The circular dichroism spectra of the complexes were discussed.