bluuebunny/crossref_metadata_2025_split huggingface dataset:
Metastable Solid Solution with Nepheline-type Structure in the CaO–Al2O3–SiO2 System
Authors: Yoshioka Takashi 
Published: July 2006

Abstract
The metastable nepheline-type solid solution in the CaO–Al2O3–SiO2 system shows the best crystal development upon devitrification on the CaAl2O4–CaAl2Si2O8 join. The crystallization occurs through the devitrification of glass at relatively low subsolidus temperatures, around 1000°C in the air. The X-ray powder diffraction patterns of the solid solution can be indexed on the basis of a hexagonal unit cell of the nepheline structure without exception. The cell parameter a of the solid solution is similar to that of nepheline, while its parameter c is smaller than that of nepheline and corresponds to that of high-temperature tridymite. When the cell parameters of the solid solution on the join are plotted against the composition, there is a break in the slope at Ca6Al12Si4O32, though the cell volume varies continuously. The nepheline-type solid solution on the join may be expressed as Ca8−(1⁄2)x\Box(1⁄2)xAl16−xSixO32, where \Box means the interstitial vacant site. The relationship between the cell parameter and the composition suggests that there should be two kinds of Ca-sites in the structure of the present solid solution, and that these kinds correspond to the alkali sites of two different sizes in the nepheline structure.
Polarographic Behaviors and Potentiostatic Determination of Kinetic Parameters for the Electrode Reaction of trans-1,2-Cyclohexanediaminetetraacetatochromate(III) Complexes
Authors: Tanaka Nobuyuki , Tomita Takeshi , Yamada Akifumi 
Published: July 2006

Abstract
The polarogographic behaviors of trans-1,2-cyclohexanediaminetetraacetatochromate(III) complex have been studied. The complex is reduced reversibly at the dropping mercury electrode in the solution which contains 0.4 m sodium chloride, 0.1 m acetate buffer and 2×10−6 m polyoxyethylene lauryl ether. The kinetic parameters of this oxidation-reduction process have been determined from the potentiostatic measurements at 25°C. The measured parameters are: the standard potential (E0)ms=−1.198Vvs. SCE, the standard rate constant (ks)ms=2.9×10−2 cm sec−1, the transfer coefficient for cathodic process (αc)ms=0.33 and that for anodic one (αa)ms=0.67. The Frumkin correction for the electrical double layer has been applied to these parameters and the corrected values thus obtained are: (E0)corr=−1.198Vvs. SCE, (ks)corr=−0.93 cm sec−1, (αc)corr=0.40 and (αa)corr=0.57.
The Separation of Gold, Platinum, and Palladium by Reversed-phase Partition Chromatography
Authors: Akaza Ikuko , Kiba Toshiyasu , Kiba Tomoe 
Published: July 2006

Abstract
For the separation of gold, platinum(IV), and palladium, and for the isolation of gold from other metals, the reversed-phase partition chromatography has been used as a column process in which TBP is adsorbed on Daiflon(polytrifluorochloroethylene moulding powder) as the stationary phase and hydrochloric acid, as the mobile phase. The separation of the above three noble metals was successfully achieved by carrying out the elution with 3–4 n HCl, and the isolation of gold was attained well of itself by virture of the fact that gold is tightly retained on the column and is only released by letting concentrated HNO3 flow through the column. The concentration and separation of gold from various solutions, such as in the presence of a large amount of iron(III) or in the presence of 19 common metals and the above three noble metals, was achieved only by allowing gold to be retained on the column and allowing ther others to flow down with a 1 n HCl eluting solution. The behavior of the three noble metals in batch extraction was also examined under the same condition as in the partition chromatography employed here; a similarity was observed between the column and the batch extraction. The principal extracted species of the noble metals might be assumed to be a hydrated and solvated ion pair, such as H(H2O)nTBP6+·HPtCl6−.
The Adsorption of 2,2′-Bipyridine and Its Ferrous Complex on the the Dropping Mercury Electrode
Authors: Sawamoto Hiromiti 
Published: July 2006

Abstract
The adsorption of 2,2′-bipyridine and its ferrous complex [Fe(bip)3]2+ onto the electrode has been studied both by the electrocapillary method and the impedancebridge method. Electrocapillary curves were obtained by the drop-time method. A peculiar shape was observed in the electrocapillary curve of [Fe(bip)3]2+, which was corrected for in the further thermodynamic treatment by taking into account the data obtained with an impedance bridge. It was found that 2,2′-bipyridine is adsorbed flat in the more positive region. At more negative potentials, the adsorption is also flat at low concentrations of 2,2′-bipyridine, but becomes perpendicular beyond 2×10−3 m. The [Fe-(bip)3]2+ adsorption can be accounted for by a Langmuir isotherm. However, the isotherm for 2,2′-bipyridine adsorption varies with the potential, which can be explained in terms of the change in the adsorption structure.
Reactive Species in the Explosion of Silver Acetylide. II. Reaction with Olefins
Authors: Taki Ko 
Published: July 2006

Abstract
The reaction of the reactive species in the explosion of silver acetylide with olefins was investigated. The main produst is acetylene. On the basis of the results of experiments on the effects of the pressure and the distance from the explosion position, the C3 and C4 products in the reaction with ethylene may be considered to be produced from a common precursor. The C4 products consist mainly of vinylacetylene and diacetylene. The formation processes of the products may consist of the decomposition of the adducts of the C2 species. The reaction with C4 olefins gives benzene, cyclopentadiene, and other products.
Polyamides and Polyureas Containing s-Triazine Rings
Authors: Yuki Yasuo , Sakurai Shoji , Kakurai Toshio , Noguchi Tatsuya 
Published: July 2006

Abstract
Several new aromatic diamines containing s-triazine rings were prepared by the reaction of the related dinitro-compounds prepared from biguanide derivatives and carboxylic acid chlorides. Polyamides and polyureas containing amino-s-triazine were synthesized by the polycondensation of these diamines with dicarboxylic acid chlorides and diisocyanates respectively. Their preparations and physical properties are described.
Sulfilimine. II. IR, UV and NMR Spectroscopic Studies
Authors: Tsujihara Kenji , Furukawa Naomichi , Oae Shigeru 
Published: July 2006

Abstract
The physical properties of several N-p-tolylsulfonylsulfilimines were studied by means of infrared, ultraviolet and NMR spectroscopic determinations. Four characteristic infrared absorption bands due to both sulfonyl and sulfilimino groups are observed and those due to both N–S(IV) and N–S(VI) stretching vibrations appear at nearly the same positions and overlap with each other. The ultraviolet spectra suggest that the sulfilimino group is not an electron donor but an electron acceptor group when conjugated with a phenyl ring and could be used to measure the pKa value of methyl-p-methoxyphenyl derivative. The NMR chemical shift of methyl protons attached to the S atom of S-methyl-S-p-tolyl derivative appears at 2.81 ppm, whereas the shifts of the corresponding sulfoxide and the sulfone groups appear at 2.69 and 3.04 ppm, respectively. From these results, it seems that the N–S(IV) bond of N-p-tolylsulfonylsulfilimine is of semipolar character while the charges on the S(IV) atom and the N atom are delocalized substantially with strong dπ conjugation into S(IV)–N–S(VI) bondings.
The Reactions of 1-Tropylazulenes with Phosphorus Pentachloride
Authors: Toda Takashi , Yamanouchi Akira 
Published: July 2006

Abstract
The reactions of three 1-tropylazulenes—ethyl 2-acetamido-3-(cycloheptatrien-7-yl)azulen-1-carboxylate (I), 2-chloro-1-(cycloheptatrien-7-yl)azulene (II) and ethyl 3-(cycloheptatrien-7-yl)-azulen-1-carboxylate (III)—with phosphorus pentachloride were investigated. The reactions of I and II gave ethyl 2-acetamidoazulen-1-carboxylate and 1,2,3-trichloroazulene respectively. On the other hand, III afforded ethyl 3-chloroazulen-1-carboxylate (IV) and (3-ethoxycarbonylazulen-1-yl)tropylium perchlorate (V). The thermal isomerization of III formed ca. 2:3 mixtures of ethyl 3-(cycloheptatrien-3-yl)azulen-1-carboxylate (IV) and ethyl 3-(cycloheptatrien-1-yl)azulen-1-carboxylate (VII), but not ethyl 3-(cycloheptatrien-2-yl)azulen-1-carboxylate. The treatment of the above mixtures with phosphorus pentachloride raised the yield of V; however, IV was also obtained. The sodium borohydride reduction of V gave ca. 2:3 mixtures of VI and VII.
On the Study of Various Reductions of 2-Benzoylcyclopentene-1-carboxylic Acid
Authors: Ohkata Katsuo , Hanafusa Terukiyo 
Published: July 2006

Abstract
It was found that the Clemmensen reduction of 2-benzoylcyclopentene-1-carboxylic acid (2a) did not give rise to 2-benzylcyclopentene-1-carboxylic acid (1), but to a mixture of cis- and trans-2-benzylcyclopentane-1-carboxylic acid (6a and 7a) contrary to the description in literature. Unsaturated acid (1) was obtained as a major product by the Wolff-Kishner-Huang-Minlon reduction of 2a accompanied with 1-carboxy-6-phenylbicyclo[3.1.0]hexane (8). The reduction of 2a with zinc dust in acetic acid and the reduction of the methyl ester (2b) by way of its thioketal were also investigated.
Cationic Arylation. III. Comparison of Phenylation of Naphthalene with Phenyl Cation and Phenyl Radical
Authors: Kobori Nobumasa , Kobayashi Michio , Minato Hiroshi 
Published: July 2006

Abstract
Naphthalene was phenylated with phenyl cation (from PhN2BF4) or phenyl radical (from PhN2BF4+NaNO2) in dimethyl sulfoxide. Partial rate factors for phenyl radical were somewhat larger than those reported with the phenyl radical generated from N-nitrosoacetanilide. Partial rate factors for phenylation with phenyl cation were smaller than those for free radical phenylation and those for common electrophilic substitution reactions. These small partial rate factors for phenyl cation were not compatible with the reaction scheme involving an ordinary σ-complex, and a mechanism involving a spiro cation appeared to be plausible.
A New Crystal with Kalsilite-type Structure on the CaAl2O4-SiO2 Join
Authors: Yoshioka Takashi 
Published: July 2006

Abstract
A new crystal phase with a kalsilite-type structure has been found in devitrified glass with compositions close to CaAl2O4 on the CaAl2O4-SiO2 join. The crystal can be synthesized as a nearly pure phase by heating the glass for 5 to 20 min at 1000°C. After prolonged heating, the crystal easily decomposes into an assemblage of the stable compounds, CaAl2O4, CaAl4O7, and Ca2Al2SiO7(gehlenite). Most of the X-ray powder diffraction lines of the kalsilite-type phase can be indexed on the basis of a hexagonal unit cell with a=5.0 Å and c=8.1 Å. In addition to these reflections, some weak ones which cannot be indexed on the basis of this unit cell are also present. The kalsilite-type phase reacts with water, resulting in heat liberation and hardening.
Magnetic Circular Dichroism of [Fe(CN)6]3−
Authors: Kobayashi Hiroshi , Shimizu Masayuki , Kaizu Youkoh 
Published: July 2006

Abstract
Magnetic circular dichroism (MGD) of [Fe(CN)6]3− was measured in aqueous solution and in a polyvinylalcohol film. The use of the polyvinylalcohol (PVA) film made it possible to measure the MCD and the absorption spectrum of an electrolyte such as K3[Fe(CN)6] at dry ice - methanol and liquid nitrogen temperatures, since the film was still optically transparent at lower temperatures. From a comparison between the observations at 300°K, 195°K and 77°K, the magnitude of an angular momentum due to the orbital motion of a hole in the ground state 2T2g (t2g5) was calculated to be 0.04–0.07 Bohr magneton (β). The observed reduction of the angular momentum was interpreted to be due to partial quenching of the orbital motion by the Jahn-Teller distortion, and also to the delocalization effect between the iron dπ orbital and the antibonding π molecular orbitals of the coordinating CN− ions. The B term in [Fe(CN)6]3−, which had been ignored, was predicted to be non-zero and was estimated as −2.4×10−3 β/cm−1 at the band I and 0.97×10−3 β/cm−1 at the band II.
Mössbauer Spectra of Iron Tetraphenylporphins
Authors: Kobayashi Hiroshi , Maeda Yutaka , Yanagawa Yasuo 
Published: July 2006

Abstract
Mössbauer spectra were measured for a series of the central iron in Fe(II)- and Fe(III) complexes of tetraphenylporphin. The electronic structure of the central iron in the complex was modified by the axial ligand field. The Mössbauer spectra assigned the most probable electronic configurations to various iron states in the iron porphins.
Photochemical Reactions of Uranyl Ions with Organic Compounds. II. The Mechanism of the Photo-Oxidation of Alcohols by Uranyl Ions
Authors: Sakuraba Shukichi , Matsushima Ryoka 
Published: July 2006

Abstract
Quantum yields were measured under various conditions for the photo-oxidation of aliphatic alcohols by uranyl ions in aqueous solutions and kinetic treatments were made. The measurements of uranyl fluorescence quenching by the alcohols showed that a complex formation between uranyl ions and alcohol molecules prior to the photolysis is not likely to be involved. The temperature effect on the quantum yield is strong evidence for a collisional energy transfer from the excited uranyl ions to the alcohol molecules. The relative rates of the photolysis of four isomeric butyl alcohols, and the isotope effect on the photo-reactivity by using alcohols labeled with deuterium, showed that the alcohol molecules are attacked on the α-hydrogen atom as a primary photochemical act.
Electron Spin Resonance of Oxidized ZnO at −195°C
Authors: Setaka Morio , Fujieda Shigeaki , Kwan Takao 
Published: July 2006

Abstract
An asymmetric ESR spectrum of ZnO at the g value of 1.96 was found to split into g=1.957 and 1.963 components at −195°C provided that ZnO was pretreated with oxygen. Temperature dependence of these two signals as well as the effect of doping Al3+ or Li+ on their intensities were investigated to qualify these signals. It was suggested that the g=1.957 signal is correlated with conduction electrons while the g=1.963 signal is ascribable to electrons trapped at interstitial zinc ions. The ZnO sample also gave rise to another signal at g=2.013 at −195°C. The signal was attributed to holes in the bulk.
Physical Chemistry of Binary Plastic Crystals. II. Dielectric Constant of the System, Carbon Tetrachloride and t-Butyl Chloride
Authors: Kotake Kayako , Nakamura Nobuo , Chihara Hideaki 
Published: July 2006

Abstract
Careful measurements of the dielectric constant of a binary system of t-butyl chloride and carbon tetrachloride were made in the entire composition range and in three different phases, the liquid, the fee solid, and the rhombohedral phases. The simple Debye theory applies to the liquid and the fee solid, giving an effective dipole moment of t-butyl chloride of 2.11±0.01 D whereas in the rhombohedral phase, it was 2.00±0.03 D. Molecular polarization shows no discontinuity between the vapor, the liquid, and the fee solid but there is a jump between the fee and the rhombohedral solids. The molecular rotation in the plastic rhombohedral phase is more hindered by 450 cal/mol than in the liquid or the fee phase. The 1:1 solid solution data were examined on the basis of the Onsager theory.
Titanium and Zirconium in Hydrothermally-altered Rocks from the Tateyama Jigokudani Hot Springs, Toyama, Japan
Authors: Imahashi Masayuki 
Published: July 2006

Abstract
Hydrothermally-altered rocks and muds collected from the Tateyama Jigokudani hot springs were analysed for titanium and zirconium. In order to estimate the acidity of the thermal waters which contributed to these altered rocks, the concentration factor of the elements relative to SiO2 was used for convenience. The titanium and zirconium contents of the alteration products are approximately equal to those of the fresh rocks. This seems to indicate that most of these elements remain in the rocks during the alteration under acidic conditions. The muds are characterized by high values of the concentration factors and the factors proved to be dependent on the acidity of the mud-suspending waters. From the relation between the concentration factors and the pH’s of the waters, we could estimate the acidities of the thermal waters which attacked the altered rocks in the earlier stages.
Complexes Coordinated by 2,2′-Bipyridine Negative Ion. I. Synthesis of Sodium 2,2′-Bipyridinetetracarbonylchromium
Authors: Kaizu Youkoh , Kobayashi Hiroshi 
Published: July 2006

Abstract
Bipyridinetetracarbonylchromium was reduced by sodium metal in tetrahydrofuran. The first stage product of the reduction which showed a spectrum similar to that of sodium bipyridine (Na+bipy−) was isolated. The complex was identified as Na[Cr(CO)4bipy] by elementary analysis. On the basis of the electronic absorption spectrum and the electron spin resonance, the complex formed in the reduction was concluded to be complex coordinated by mononegative ion of bipyridine and should be named sodium 2,2′-bipyridine(1−)-tetracarbonylchromium(0).
Syntheses of Organic Phosphates. II. 3-Hydroxy-2-pyridylmethyl, 6-Methyl-2-pyridylmethyl, 3-Pyridyl and 8-Quinolyl Phosphate
Authors: Murakami Yukito , Sunamoto Junzo , Sadamori Hiromi , Kondo Hiroki , Takagi Makoto 
Published: July 2006

Abstract
The phosphorylation of 3-hydroxy-2-pyridylmethanol and 6-methyl-2-pyridylmethanol was carried out with pyrophosphoric acid. 3-Pyridinol and 8-quinolinol were phosphorylated in pyridine by using five- to ten-fold molar amount of phosphoryl chloride at room temperature or below. The chromatographic elution of the reaction mixtures on a column of cation-exchange resin, with water as an eluent, was found to be effective for separation and purification of the products in most cases, while 8-quinolyl phosphate was obtained directly from the concentrated reaction mixture. These phosphates, with the exception of 3-hydroxy-2-pyridylmethyl phosphate, follow acid dissociation processes similar to the case of pyridylmethyl phosphates. The effect of the 3-hydroxy group in 3-hydroxy-2-pyridymethyl phosphate on its acid dissociation processes was discussed. A symmetric pyrophosphate ester was also isolated in the course of phosphorylation of 3-pyridinol.
Reaction of P-N Compounds with Alkylating Reagents such as Alkyl Benzenesulfonates and Dialkyl Sulfates
Authors: Koketsu Jugo , Ishii Yoshio 
Published: July 2006

Abstract
The reaction of N,N′-dialkyl-diphenylphosphinous amides (I) with alkyl benzenesulfonates (III) or dialkyl sulfates (IV) took place exothermally, giving phosphonium salts (V). When phosphonium salts (V) were heated at 100°C for 5–10 hr, asymmetric phosphine oxide (VI) and N,N′-dialkyl-benzenesulfonamides (VII) or polymeric materials were obtained. In the case of diphenyl dialkylphosphoramidites (II), no quaternization was observed at room temperature. However, diphenyl alkylphosphonates (VIII) and N,N′-dialkylbenzenesulfonamides (VII) or the same polymeric materials were obtained through intermediate phosphonium salts when the mixture was heated.
Cyclizations of Thioureas with a Hydroxy Group at the β-Position of the N-Substituent. II. Oxidation with Thionyl Chloride to Benzothiazoles
Authors: Iwakura Yoshio , Kurita Keisuke 
Published: July 2006

Abstract
The reaction of N′-alkyl and N-phenyl substituted thioureas with a hydroxyl group at the β-position of the N-substituent with thionyl chloride gave benzothiazole derivatives by an oxidative cyclization reaction; no other products, such as thiazolines or oxazolines, were formed. The structure was confirmed by the various spectral and chemical data.
Conformations of the Ester Group
Authors: Oki Michinori , Nakanishi Hiroshi 
Published: July 2006

Abstract
In some esters of formic acid which carry bulky alkyl groups (e .g, t-butyl formate, 1,1-diethylpropyl formate, and triphenylmethyl formate), the presence of s-cis conformer has been confirmed by various spectroscopic techniques. The dipole-moment measurements also support the conclusion drawn from the spectroscopic data.
Thermal Demercuration Reactions of Organomercurials
Authors: Inamoto Naoki , Yoshifuji Masaaki 
Published: July 2006

Abstract
Thermal demercuration reactions of organomercurials (RHgX) alone or with mercuric salts (HgY2) were performed (where R=n-butyl, s-butyl, cyclohexyl, benzyl, phenyl, and p-tolyl; X,Y=Cl, Br, CN, SCN, and OAc). Alkyl chlorides were obtained in good yields in the cases of alkylmercuric chlorides. The results in the reactions of cyclohexylmercuric halides with mercuric salts suggested the exchange reaction between them. Thermal demercuration reactions of aryl-mercurials gave the corresponding aromatic hydrocarbons as main product, and their mechanisms which involve generation of aryl radicals were discussed. General mechanisms of demercuration reaction of organomercurials alone were also discussed, and the importance of intermolecular interaction between organic group and chlorine was suggested in the cases of aliphatic organo-mercuric chlorides.
Reactions of Aziridines with Acetyl Chloride and Related Compounds
Authors: Okada Itaru , Takahama Toshio , Sudo Rokuro 
Published: July 2006

Abstract
When aziridines (1) were treated with acetyl compounds, such as acetyl chloride, acetic acid, acetic anhydride, and thioacetic acid, the corresponding acetamide derivatives were obtained in good yields. In the case of acetyl chloride, some derivatives of N-(2-chloroethyl)acetamide (5) were found to be unstable in the face of moisture; they were easily hydrolyzed to give N-(2-hydroxyethyl) acetamide hydrochlorides (3). The NMR spectrum of N-(2-mercaptoethyl)-N-benzylacetamide (12) was discussed.
Studies on Associated Solutions. II. Heat of Mixing of Methanol with Aliphatic Amines
Authors: Nakanishi Koichiro , Touhara Hidekazu , Watanabe Nobuatsu 
Published: July 2006

Abstract
The heat of mixing has been measured at 25.00°C and 45.00°C for binary mixtures of methanol with n-butylamine, diethylamine and triethylamine. A twin-type conduction calorimeter was used. All the systems exhibit large negative enthalpies of mixing, which become slightly less negative as the temperature increases. From the present results and vapor-liquid equilibrium data, the excess free energy and entropy of mixing at 25.00°C have been calculated for each system. The sign and magnitude of the excess functions were as follows: HM&lt;TSE&lt;GE&lt;0 for methanol with n-butylamine and diethylamine, GE&gt;0, TSE&lt;HM&lt;0 for methanol with triethylamine. These facts were interpreted in terms of steric effects and specific solvation in the hydrogen bonding between hydroxyl group and amino bases.
The Electronic Nature of Paramagnetic Oxygen Species Combined with Metal Ions at Surface and in Solution
Authors: Setaka Morio , Kwan Takao 
Published: July 2006

Abstract
ESR spectra of adsorbed oxygen species were investigated on cadmium, cerium and uranium oxides supported on alumina. The principal g values, gx, gy and gz of the oxygen species were computed and compared with those on the other metal oxides. It was pointed out that the principal g values observed on cerium and uranium oxides are interpretable by a peroxy-like model rather than an O2− radical. ESR spectra due to radicals formed on mixing solutions of VO2+ or UO22+ (containing Ti3+) with H2O2 were also investigated by a rapid-mixing flow technique. The g value of the radicals was very close to the isotropic one of the peroxy-like species adsorbed on the corresponding metal oxide. The electronic nature of the interaction of oxygen species with metal ions at surface and with those in solution was comparatively discussed.