bluuebunny/crossref_metadata_2025_split huggingface dataset:
ESR Study on Molecular Motion of CO2− Radical Adsorbed on Zeolite
Authors: Edlund Ove , Sohma Junkichi , Sogabe Kunihisa 
Published: July 2006

Abstract
Molecular motion of 13CO2− radical adsorbed on zeolite was quantitatively analysed from the temperature variation of the separation of hyperfine structure of ESR spectra from 13CO2− radicals.
Ionic Equilibria in Micellar Solutions
Authors: Shirahama Keishiro 
Published: July 2006

Abstract
Ionic equilibria in micellar solutions are discussed on the basis of micelle-monomer equilibrium, massconservation, and electroneutrality. The present treatment gives a larger degree of counterion dissociation from micelles than ever estimated. Another conclusion is a decreasing concentration of monomeric surface-active ion as micellar concentration increases.
Dissociative Electron Attachment to (Chloroethyl)benzenes in γ-Irradiated Organic Glassy Matrices
Authors: Saito Takayuki , Yoshida Hiroshi 
Published: July 2006

Abstract
Free radicals formed from (1- and 2-chloroethyl) benzene in γ-irradiated organic matrices were studied with a fluroescence spectrophotometer. The observed spectra suggest the transformation of phenetyl radical primarily formed from (2-chloroethyl)benzene to α-methyl-benzyl radical and indicate interaction between the α-methylbenzyl radical, formed from both (1- and 2-chloroethyl)benzene, and chloride anion before complete dissociation.
Formation of Erbium and Holmium Mixed Completes with Complexane and Carbonate Ion
Authors: Taketatsu Tomitsugu 
Published: July 2006

Abstract
The formation of erbium and holmium mixed complexes with one species of complexanes and carbonate ion in alkaline solution (pH 10.5–10.7) was investigated spectrophotometrically. The results suggest that carbonate ion additionally combines with the EDTA and CyDTA chelates, while does not with the DTPA chelates.
Olefin Disproportionation by Molybdenum(0) Complexes and Aluminum Halides
Authors: Hidai Masanobu , Tatsumi Takashi , Uchida Yasuzo 
Published: July 2006

Abstract
MoN2(PPh3)2·PhMe and Mo(CO)(PPh3)2 were activated by aluminum halides to give catalysts effective for the disproportionation of 2-pentene.
The Photochemical and the Thermal Reaction of Dimethyl trans-Spiro[2.6]nona-4,6,8-triene-1,2-dicarboxylate
Authors: Saito Katsuhiro , Toda Takashi , Mukai Toshio 
Published: July 2006

Abstract
The irradiation of dimethyl trans-spiro[2.6]nona-4,6,8-trien-1,2-dicarboxylate (I) with a low-pressure mercury lamp afforded two tricyclic valence isomers (II and III). Upon heating, II and III were converted into dimethyl trans-indan-1,2-dicarboxylate (IV), which was also obtained by the thermolysis of I. In order to elucidate the reaction mechanism for the formation of IV from I, we studied the thermal reaction using a deuteriumlabelled compound (V).
4-Oxo-1,2,3,4-tetrahydroquinazolines, V. Ring Expansion Reaction of 1-Methyl-3-phenyl-4-oxo-3,4-dihydroquinazolinium Bromide with Diazoalkanes
Authors: Yamada Yoshihisa , Oine Toyonari , Inoue Ichizo 
Published: July 2006

Abstract
Reactions of 1-methyl-3-phenyl-4-oxo-3,4-dihydroquinazolinium bromide (13) with diazoalkanes were investigated. Treatment of 13 with diazomethane in EtOH gave a ring-expansion product 14 in a good yield. A mechanism which involves the formation of azirinoquinazolinium bromide and a subsequent SN1 type ring opening was discussed. Treatment of 13 with phenyldiazomethane also afforded benzodiazepine 16. However, reaction of 13 with ethyldiazoacetate in the presence of CuSO4 gave 4-oxo-1,2,3,4-tetrahydroquinazoline 17.
A Molecular Orbital Study on the Effects of Excess Charges at the Donor and Acceptor Atoms on the Hydrogen Bond
Authors: Igawa Akira , Fukutome Hideo 
Published: July 2006

Abstract
Effects of the excess charges at the donor and acceptor atoms on the properties of the hydrogen bond were studied in a simple three-center four-electron model for a hydrogen bond system using CNDO/2 type molecular orbital calculation. It was shown that three types of hydrogen bonds, normal, proton transferred and abnormal, are possible according to the value of the excess charges. The dependence of the hydrogen bond distance, proton equilibrium distance, frequency of proton stretching vibration and hydrogen bond energy on the excess charges were calculated for the normal type hydrogen bond. The correlations between these quantities obtained by changing the amounts of the excess charges are in good agreement with the experimental results, suggesting that the excess charges at the donor and acceptor atoms primarily determine the correlation. The potential of proton movement at the equilibrium hydrogen bond distance is shown not to have double minima for any value of the excess charges, indicating that the excess charges are not essential for producing a double well potential.
The INDO and CNDO/2 SCF LCAO MO Calculation of Intermodular Forces and Their Pairwise Additivity
Authors: Hashimoto Masao , Isobe Taro 
Published: July 2006

Abstract
The assumption of pairwise additivity of the intermolecular forces was examined within a CNDO/2-Clementi approximation. It was found that the deviation from the pairwise additivity, defined as the difference between the three-body interaction and the sum of the two-body interaction energies in the system of three neighboring molecules in a crystal, was small enough to be neglected as compared with the lattice energy. The CNDO/2 -Glementi method, in which the overlap integrals are calculated by using the Clementi AO’s, was found to be more useful than the usual CNDO/2 method, in which the overlap integrals are calculated by means of Slater AO’s. The discrepancy in the calculated interaction energies from the experimental ones in the form of the heat of sublimation was found to be quite large for CO. This discrepancy becomes small, though, if the centers of the molecules are displaced away from the origin and along the nonintersecting threefold axes of the unit cell; the crystal structure belongs not to the Pa3 space group, but to the P213 space group. From a comparison of the CNDO/2-Clementi results and the results of the exp-6 potential superimposed on the quadrupole-quadrupole interaction potential, it was found that the former is superior to the latter in anticipating the conformation of the (CO2)2 dimer.
Theory of Ion Cyclotron Resonance Power Absorption for Nonreactive and Reactive Ions
Authors: Aoyagi Katsuyuki 
Published: July 2006

Abstract
An exact solution of the equation of motion and exact expressions of the ion current in ion cyclotron resonance power absorption were obtained. Instantaneous and total power absorptions together with power absorption line shapes were derived. Ion current expressions were also derived for both nonreactive and reactive ions over the whole range of pressure. The results agreed with those obtained previously for high and low pressures with appropriate approximation. The rate constants for the disappearance of primary ions and for the formation of nonreactive secondary ions were obtained from the ion cyclotron resonance experiments. The results showed good agreement with those obtained by other methods.
The Crystal Structure of dl-1,1,4aα-Trimethyl-2α-hydroxy-8β-methoxy-1,2,3,4,4a,5,6,7,8,9-decahydrophenanthrene
Authors: Furusaki Akio , Hamanaka Nobuyuki , Matsumoto Takeshi 
Published: July 2006

Abstract
The crystal structure of the title compound has been determined from three-dimensional data collected on an automatic, four-circle diffractometer. The racemic crystals are triclinic, with two molecules in a unit cell of these dimensions; a=10.502, b=11.706, c=7.488 Å, α=71°33′, β=91°46′, and γ=116°22′. The space group is P\bar1. The structure was solved by the symbolic addition method and was then refined by the block-diagonalmatrix least-squares method, with isotropic temperature factors for the hydrogen atoms and with anisotropic ones for the others. The final R value was 6.7%. The length of the C–C single bond opposite to the double bond in the cyclohexene ring is only 1.34±0.01 Å. This apparent remarkable shortening can be well explained on the assumption that the two atoms concerned vibrate vigorously with parallel and antiparallel harmonic components perpendicular to the plane of the ring. It is shown that, if the root-mean-square amplitudes of the former components are taken to be equal to that of the thermal vibration of the carbon atom adjacent to one of the two atoms, the above C–C distance, corrected for these antiparallel motions, becomes quite reasonable: 1.60 Å.
An Investigation of the Gas-Solid Interface Reaction on the Surface of Ag and Ag2S
Authors: Katsumoto Masayuki , Fueki Kazuo , Mukaibo Takashi 
Published: July 2006

Abstract
In order to elucidate the mechanism of the redox reaction at the gas-solid interface, the isotopic exchange between H2S and D2 on Ag and Ag2S has been studied in the temperature range from 410 to 521°C. The transfer of isotopic species between “hydrogen sulfide” 1) and “hydrogen” 1) was found to proceed by means of the reaction:
“H_2S”^1)\oversetk_i\undersetk_i’\ightleftarrows“H_2”^1)+S(ad)
on both surfaces. From the analysis of the kinetic data, the redox reaction rate constants, ki and ki′, were determined as a function of the sulfur activity. It was found that ki is inversely proportional to the sulfur activity, whereas ki′ is independent of it. The mechanism of the reaction on the surfaces of Ag and Ag2S is discussed.
An ESR Study of Nitric Oxide Adsorbed on Silica Gel
Authors: Iwaizumi Masamoto , Kubota Shozo , Isobe Taro 
Published: July 2006

Abstract
Nitric oxide adsorbed on silica gel was investigated by ESR. It was found that there are at least two adsorption sites for nitric oxide; one of them is on the silica gel which has been pretreated at low temperatures (below ca. 500 °C) (Site L), while the other is predominantly on the silica gel which has been pretreated at high temperatures (above ca, 500 °C) (Site H). The crystal-field splitting of the Πx* and ΠY* states, which are originally degenerate, was determined to be 0.26 eV for the nitric oxide adsorbed on Site L and 0.52 eV for the nitric oxide on Site H. The temperature dependence of the ESR spectrum was also examined, and the average crystal field acting on nitric oxide was found to decrease with an increase in the temperature.
Molecular Structure of N-Methylformamide as Studied by Gas Electron Diffraction
Authors: Kitano Mitsuo , Kuchitsu Kozo 
Published: July 2006

Abstract
The bond distances (rg) and angles (ra) in N-methylformamide HCONHCH3 have been determined by gas electron diffraction as follows: N–C (methyl)=1.459±0.006 Å, C(carbonyl)–N=1.366±0.008 Å, C=O=1.219±0.005 Å, C–H(methyl)=1.114±0.025 Å, &lt;N–C=O=124.6±0.5° and &lt;C–N–C=121.4±0.9°, where uncertainties represent estimated limits of experimental error. Systematic trends are observed among the skeletal structures of formamide, acetamide, N-methylformamide and N-methylacetamide. A conformer with the C(carbonyl)–H and N–C(methyl) bonds trans to each other is found to be dominant in the gas phase. The presence of a small fraction of the cis conformer is suggested, but the experimental evidence is not conclusive.
The Chemistry of Americium. II. The Behavior of Am(III), Am(V), and Am(VI) in Column Chromatography, with Bis(2-ethylhexyl)phosphoric Acid Used as the Extractant
Authors: Hara Mitsuo , Suzuki Shin 
Published: July 2006

Abstract
The behavior of Am(III), Am(V), and Am(VI) in column chromatography with bis(2-ethylhexyl)phosphoric acid(HDEHP) used as the extractant were investigated in comparison with that of Np(IV), Np(V), and Np(VI). When the solution of Am(VI) was submitted to the column chromatography, it was found that Am(VI) was rapidly reduced to Am(V) and partially to Am(III) by HDEHP, irrespective of the conditions, such as the flow rate, the acidity, and the composition and temperature of the influent. The optimum conditions for the separation of Am(V) and Am(III) and for the preparation of the Am(V) solution were established by utilizing the difference in the adsorbability on the column bed between Am(III) and Am(V). When a freshly-prepared Am(V) solution was submitted to column chromatography, it was found that Am(V) was also reduced to Am(III) as well as Am(VI) by HDEHP. The percentage of the Am(V) fraction eluted strongly depended on the conditions in the column chromatography, but it was found to be constant within the limits of experimental error under definite conditions as long as the same column was used. This fact was applied to the determination of the Am(V) content in the mixed solution of Am(III) and Am(V). The content of Am(V) decreased slowly in the nitrate, acetate, sulfate, and perchlorate solutions at lower temperatures, but it rapidly decreased in the chloride, iodide, sulfite, and hydrogen peroxide solutions even at 0 °C. The content of Am(V) decreased more rapidly at higher temperatures, and the kinetic analysis showed that the reduction of Am(V) apparently followed the first-order kinetics in the acetate solutions.
Syntheses of N,N′-Bis(1-acetonylethylidene)ethylenediamine Complexes of Rare Earth Perchlorates
Authors: Yoshida Norifumi , Matsumoto Akira , Shiokawa Jiro 
Published: July 2006

Abstract
N,N′-Bis(1-acetonylethylidene)ethylenediamine(AEH2) complexes were prepared by the reaction of hydrous rare earth perchlorates with AEH2 in methanol. Elemental analysis, X-ray powder diffraction analysis, pH titration, IR and luminescence spectrometries indicated that the complexes of the lighter rare earths were Ln(AEH2)4(ClO4)3, where Ln are La, Pr, Nd, and Sm, while the complexes of the heavier rare earths were hydroxocomplexes, Ln(AEH2)2(ClO4)2(OH)·H2O, where Ln are Gd, Dy, and Er. Anhydrous gadolinium perchlorate was reacted with AEH2 in methanol under anhydrous conditions to give Gd(AEH2)4(ClO4)3. It was possible that a water molecule played an important role in the complexation of rare earth perchlorates with AEH2 in methanol. The formation of the hydroxocomplexes with AEH2 was related to the low coordinating ability of the perchlorate ion and to the charge densities of the rare earth ions as well as to the basicity of AEH2.
Thermal Reaction in a Series of Ammineisothiocyanatochromium(III) Complexes in Solid State
Authors: Oki Hisaya , Yasuoka Meiji , Tsuchiya Ryokichi 
Published: July 2006

Abstract
The thermal decomposition of [Cr(NH3)6](SCN)3, [Cr(NCS)(NH3)5](SCN)2 and cis-[Cr(NCS)2(NH3)4]SCN in solid state was studied by isothermal as well as continuous temperature-rise methods. Under isothermal heating at 140°C, [Cr(NH3)6](SCN)3 changed stepwise to cis, trans-[Cr(NCS)3(NH3)3] through trans-[Cr(NCS)2(NH3)4]SCN, [Cr(NCS)(NH3)5](SCN)2 turning to the cis-trans complex over the trans complex in the same manner as [Cr(NH3)6](SCN)3. Under the continuous temperature-rise, [Cr(NH3)6](SCN)3, [Cr(NCS)(NH3)5](SCN)2 as well as trans-[Cr(NCS)2(NH3)4]SCN were found to be directly converted into cis,trans-[Cr(NCS)3(NH3)3].
Derivatographic Studies on Transition Metal Complexes. XIII. Thermal Decomposition of [Ni(N2H4)6]X2 Complexes
Authors: Tsuchiya Ryokichi , Yonemura Masaaki , Uehara Akira , Kyuno Eishin 
Published: July 2006

Abstract
The thermal decomposition of [Ni(N2H4)6]X2 (X=Cl, Br, I) in solid phase was investigated by means of derivatography and IR spectral measurement. It was found from the derivatography that the decomposition of the chloride and bromide proceeded via tris-, bis-, and mono-hydrazine complexes as metastable reaction intermediates, while tetra-hydrazine complex was produced in the decomposition of the iodide instead of the tris-one which appeared in the chloride and bromide. IR spectra showed that, although the hexa-hydrazine complex as a starting material contains only unidentate hydrazine coordinated by either one of terminal nitrogen atoms, all the reaction intermediates have bidentate one bridging between two nickel ions. In particular, it was of much interest that the decomposition of these hydrazine complexes was remarkably exothermic, a part of the reasons being discussed.
Photo-Beckmann Rearrangements of Oximes of Androsterone and 13α-Androsterone
Authors: Suginome Hiroshi , Uchida Tsutomu 
Published: July 2006

Abstract
The photolysis of androsterone oxime and 13α-androsterone oxime affords isomeric lactams with and without the original configuration of the C-13 substituent of the starting oxime, although there were poor yields and no products due to photo-Beckmann fission. The formation of an epimeric pair of lactams from an oxime is at variance with our previous results on the photolysis of 5α- and 5β-cholestan-6-one oximes, in which the stereochemical integrity of the terminus of the migrating carbon in the photo-Beckmann rearrangement was observed. The implication of the present results for the migration step of the photo-Beckmann rearrangement is discussed.
The Chlorination of Olefins with Antimony(V) Chloride
Authors: Uemura Sakae , Onoe Akira , Okano Masaya 
Published: July 2006

Abstract
Antimony(V) chloride was revealed to be a good reagent for the cis-chlorination of simple olefins in chlorinated hydrocarbon solvents, such as 1,2-dichloroethane, dichloromethane, chloroform, and carbon tetrachloride. The higher the reaction temperature or the solvent polarity was, the higher the selectivity for cis-chlorination became. From 1,3-butadiene, cis-1,4-dichloro-2-butene was formed together with the trans-1,4- and 1,2-dichloro isomers. In the cases of cyclopentene and norbornene, the trans-1,2-dichloride and other various dichlorides were obtained without any formation of the cis-1,2-isomer. Probable mechanisms for this chlorination are briefly discussed.
Rotational Isomerism in Methyl-d-amine
Authors: Tamagake Keietsu , Tsuboi Masamichi 
Published: July 2006

Abstract
Infrared absorption spectra of methyl-d-amine and methyl-d-amine-d2 have been observed in their gaseous states. For each of seven vibrations of the former and seven vibrations of the latter, two Q-branch peaks are observed assignable to trans and gauche forms of the molecule. In the microwave absorption spectrum of methyl-d-amine 60 lines assignable to the trans form (whose rotational constants are A=86085, B=20546, and C=20475 MHz) and 140 lines assignable to the gauche form (A=86512, B=21243, and C=19911 MHz) are found. Every trans line shows an inversion doubling which is considered to reach an observable amount only through a trans-gauche mixing of the vibration-rotation wavefunctions. This trans-gauche mixing should in turn depend upon the energy difference ΔETG between the ground vibration-rotation levels of the trans and gauche forms. On the basis of the observed amount of the inversion splitting, ΔETG has been determined to be 6.7±0.4 cm−1. The ΔETG value has then been refined by observing an accidental degeneracy of the trans and gauche energy levels, so that ΔETG=7.06±0.03 cm−1.
Very-high-dose-rate Radiolysis of n-Butane in the Gas Phase. The Effect of the Addition of Electron Scavengers
Authors: Hatano Yoshihiko , Takao Satoshi , Namba Hideki , Ueno Takumi , Shida Shoji 
Published: July 2006

Abstract
The dose rate and its pulse-to-pulse reproducibility of very-high-intensity electron pulses have been measured. The effect of the addition of electron scavengers on the neutralization processes in the gas-phase radiolysis of n-butane has been examined by using this very high dose-rate electron pulse.
Flash-Spectroscopic Study of Phthalazine
Authors: Kanamaru Nobuaki , Nagakura Saburo , Kimura Katsumi 
Published: July 2006

Abstract
The phthalazine triplet and the hydrogen-abstracted radical were obtained in ethanol etc. at room temperature, suggesting that the T1 is of nπ* type, whereas only the T–T absorption spectrum was obtained in acidic ethanol as reported in EPA glass at 77 K.
A Solvent-Extraction Study of Zinc(II) Complexes with Several Divalent Anions of Carboxylic and Inorganic Acids
Authors: Moriya Hiromitsu , Sekine Tatsuya 
Published: July 2006

Abstract
Stability constants of zinc(II) mono- and biscomplexes with C2 to C6 dicarboxylic acids and with sulfate, thiosulfate and selenate ions determined at 25 °C by solvent extraction are described. The stability order of the dicarboxylate complexes decreases in an order of C2&gt;C3&gt;C4\simeqC5\simeqC6 whereas that of the inorganic acids are nearly similar.
The Migration of Electronic Excitation Energy in Copolymers of N-Vinylcarbazole with a Small Content of Styrene or Vinyl Acetate
Authors: Okamoto Kenichi , Yano Akikazu , Kusabayashi Shigekazu , Mikawa Hiroshi 
Published: July 2006

Abstract
The migration of electronic excitation energy in films of copolymers rich in N-vinylcarbazole has been studied by fluorescence quenching experiments using dimethyl terephthalate and perylene as guest molecules. The efficiency of the singlet exciton migration is almost the same for the copolymers and for poly-N-vinylcarbazole.
Reactions of Tris(acetylacetonato)manganese(III) and -cobalt(III) with 1,10-Phenanthroline and α-Methylstyrene
Authors: Kaeriyama Kyoji 
Published: July 2006

Abstract
Lower-valence-state compounds, bis(acetylacetonato)manganese(II) and bis(acetylacetonato)(1,10-phenanthroline)manganese(II), were prepared from tris(acetylacetonato)manganese(III). ESR spectra of manganese(II)compounds were shown. Bis(acetylacetonato)(1,10-phenan-throline)Co(II) was also prepared. The results were compared with activity for the initiation of radical polymerization.
The Synthesis of Crystalline Hydrated Double Carbonates of Rare Earth Elements and Sodium
Authors: Mochizuki Akihiko , Nagashima Kozo , Wakita Hisanobu 
Published: July 2006

Abstract
Crystalline hydrated double carbonates of rare-earth elements and sodium were obtained by adding sodium carbonate solutions to rare-earth chloride solutions. The formula of the precipitates was determined to be LnNa(CO3)2·6H2O (Ln=La, Ce, Nd, Sm, Gd, Dy, and Y). The products have similar X-ray powder diffraction patterns, which were indexed assuming a tetragonal symmetry. The cell parameters of the products were calculated, they decrease linearly with the decrease in the ionic radii of the rare-earth elements.
Role of Germanate Catalyst in the Transformation of Germanium Dioxide
Authors: Yonemura Michiko , Kotera Yoshihide 
Published: July 2006

Abstract
The role of alkali germanates as catalysts in the polymorphic transformation of germanium dioxide was investigated by high-temperature X-ray diffraction method. Lithium germanate and sodium germanate catalyze the transformation in a solid state, the activation energies being larger than 80 kcal/mol. Potassium germanate catalyst plays its role in a liquid state, the activation energy being smaller than that of other catalysts.
Effect of Surrounding Atmosphere in the Transformation of Germanium Dioxide
Authors: Yonemura Michiko , Kotera Yoshihide 
Published: July 2006

Abstract
The effect of surrounding atmosphere on the phase transformation of germanium dioxide with alkali germanate catalysts was investigated by high temperature X-ray diffraction method. The catalysts were Li2O·7GeO2, 3K2O·11GeO2, K2O·7GeO2 and 2Na2O·9GeO2. The ambient atmospheres were dry or wet nitrogen and oxygen. The effect of atmosphere was found to be not so large as that of the catalyst. Water vapor has prominent effects upon the transformation as in other solid state reactions.