bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Crystal Structure of 13H-Dibenz[a,de]anthracen-13-one
Authors: Oonishi Isao , Fujisawa Shoji , Aoki Junji , Ohashi Yuji , Sasada Yoshio 
Published: July 2006

Abstract
Crystals of the title compound, C21H12O, are orthorhombic, belong to the space group Pn21a, have lattice constants of a=14.227(3), b=15.551(4), c=12.436(3) Å, and also have Z=8. The structure was determined using the direct method and was refined by using a full-matrix least-squares method to an R value of 0.106 on the basis of 1964 reflections with |Fo|&gt;3σ(|Fo|). The molecules is slightly distorted from the planar conformation owing to a steric repulsion between the O and H atoms. The molecules are stacked in pairs and two pairs with different overlapping modes are randomly arranged with different populations. It has been qualitatively explained that the populations of disordered molecules reflect the difference in their lattice energies.
Thermochemical Studies on 3- and 4-Nitroanilines and Their N,N-Dimethyl Derivatives
Authors: Furukawa Junichi , Murata Shigeo , Sakiyama Minoru , Seki Syûzô 
Published: July 2006

Abstract
Standard enthalpies of combustion and of sublimation at 298.15 K were determined and standard enthalpies of formation in crystalline and gaseous states were derived for N,N-dimethyl-3- and N,N-dimethyl-4-nitroanilines by calorimetric measurements. Stabilization energies due to the intramolecular interaction between substituents were evaluated and discussed for these compounds and 3- and 4-nitroanilines.
The Dehydration of Ketohexoses into 5-Chloromethyl-2-furaldehyde. The Isolation of Diketohexose Dianhydrides
Authors: Hamada Kazuhiko , Yoshihara Hiroshi , Suzukamo Gohfu , Hiroaki Osamu 
Published: July 2006

Abstract
The isolation of diketohexose dianhydrides, produced during the dehydration of d(−)-fructose and l(−)-sorbose with concentrated hydrochloric acid, in a mixture containing water, an organic solvent and a catalytic amount of a surface-active agent is described.
The Formation and Solubility of Various Lead(II) Compounds Prepared by the Hydrolysis of Lead(II) Nitrate
Authors: Narita Eiichi , Okayasu Hiroshi , Naito Hiroyuki 
Published: July 2006

Abstract
Lead(II) nitrate was hydrolyzed by mixing with sodium hydroxide solutions at 25 and 50 °C. Four kinds of lead(II) hydroxide nitrates and two kinds of lead(II) oxides (massicot and litharge) were formed, depending on the pH, temperature, lead(II) nitrate concentration, and aging time of the suspension. The solubility of the products was also measured.
Preparation and Stereochemistry of Bis(ethylenediamine)cobalt(III) Complexes with Selenium Donor Atom
Authors: Konno Takumi , Okamoto Ken-ichi , Hidaka Jinsai 
Published: July 2006

Abstract
Five optically active cobalt(III) complexes of [Co(bidentate-N,Se)(en)2] type were prepared; here bidentate-N,Se denotes 2-aminoethaneselenolato (aes), 2-aminoethaneselenenato (aesee), 2-(methylseleno)ethylamine (mseea), 2-(ethylseleno)ethylamine (eseea), and 2-(benzylseleno)ethylamine (bseea). These complexes were characterized from their absorption, CD and 1H NMR spectra. Of these complexes, the crystal structure of (+)500CD-[Co(mseea)(en)2](ClO4)3 was determined by the X-ray diffraction method. The red plate crystal was orthorhombic, space group P212121, a=12.220(15), b=19.224(7), c=8.977(11) Å, Z=4, and the final R value was 0.087. The coordinated selenium atom takes the (R) configuration for the Λ isomer. The absorption and CD spectra of the five complexes are discussed in comparison with those of the corresponding cobalt(III) complexes containing a coordinated sulfur atom.
Preparation and Characterization of Cobalt(III) Complexes with S,S-Bridge R,S-Sexidentate-N2,S2,O2 Type Ligands. Crystal Structure of (+)560CD-((2R,9S)-Diamino-3,3,8,8-tetramethyl-4,7-dithia-1,10-decanedioato)cobalt(III) Ion
Authors: Kanesaka Mikako , Okamoto Ken-ichi , Nomoto Masayo , Hidaka Jinsai 
Published: July 2006

Abstract
[Co(R,S-sexidentate-N2,S2,O2)] and [Co(R-terdentate-N,S,O)(S-terdentate-N,S,O)] type complexes, including the title complex cation, [Co(R,S-ebp)]+, were prepared and resolved. The crystal structure and absolute configuration of the (+)560CD-[Co(R,S-ebp)]+ isomer were determined by X-ray diffraction. The complex cation has an [S] configuration. The R,S-ebp coordinates as a sexidentate, of which two sulfur donor atoms take selectively R(S). The absorption and CD spectra are discussed in comparison with those of the related complexes.
Concentration Dependence of Transport Properties of Glass-forming Melts
Authors: Mahiuddin Sheik , Ismail Kochi 
Published: July 2006

Abstract
The Vogel-Tammann-Fulcher (VTF) equation has been derived from the Adam-Gibbs (AG) model after accounting for the empirical nature of the temperature dependence of configurational heat capacity. An expression for describing the concentration dependence of the preexponential parameter of the VTF equation and another two-parameter isothermal equation for describing such dependences of transport properties are obtained. The applicability of the newly derived equations has been verified using the data available for several hydrate melts. The present study emphasizes the view that the glass transition temperature controls the concentration dependence of transport properties of glass-forming melts.
Preparation and Characterization of [CoX2(edpp)2]+(edpp=NH2CH2CH2P(C6H5)2, X=Cl−, Br−, I−, NCO−, NCS−, N3−, NO2−) and [CoX2(en)(dppe)]+(en= NH2CH2CH2NH2, dppe=(C6H5)2PCH2CH2P(C6H5)2, X=Cl−, Br−, NCS−). Crystal Structures of trans(NCS,NCS),cis(P,P)-[Co(NCS)2(edpp)2]Br·3H2O·(CH3)2CO and cis-(NCS,NCS),trans(P,P)-[Co(NCS)2(edpp)2]-Br·CH3OH
Authors: Atoh Masamichi , Kashiwabara Kazuo , Ito Haruko , Ito Tasuku , Fujita Junnosuke 
Published: July 2006

Abstract
Dianionocobalt(III) complexes of the [CoX2(edpp)2]+-type (X=Cl−, Br− I−, NCO−, NCS−, N3−, NO2−) have been prepared, where edpp is (2-aminoethyl)diphenylphosphine. The corresponding [CoX2(en)(dppe)]+ complexes are rather unstable and have been obtained only for X=Cl−, Br−, and NCS−, where en and dppe denote ethylenediamine and 1,2-bis(diphenylphosphino)ethane, respectively. Except for the NCS− complex of edpp, only one geometrical isomer has been obtained for all the complexes. Two geometrical isomers of [Co(NCS)2(edpp)2]+ have been isolated, and crystal structures of trans(NCS,NCS),cis(P,P)-[Co(NCS)2(edpp)2]Br·3H2O·(CH3)2CO and cis(NCS,NCS),trans(P,P)-[Co(NCS)2(edpp)2]Br·CH3OH have been determined by X-ray analyses. The NCS− ions in these complexes coordinate to the cobalt(III) ion through their nitrogen atoms with nearly linear Co–N–C–S fragments. The Co–P distances in the isomers are similar to one another, but the average Co–NH2 and Co–NCS distances in the trans(NCS,NCS) isomer (2.010 and 1.882 Å) are longer and shorter than those of the cis(NCS,NCS) isomer (1.970 and 1.960 Å), respectively. Absorption spectra of all the complexes in solution have been recorded and the results compared with those of related dianionocobalt(III) complexes.
Noncovalent Interactions in Metal Complexes. VIII. Syntheses, Properties, and Stereoselectivities of Lanthanoid Complexes with 1-l-Menthyloxy-3-benzoylacetone
Authors: Nakamura Michio , Okawa Hisashi , Kida Sigeo , Misumi Seizo 
Published: July 2006

Abstract
Lanthanoid complexes with 1-l-menthyloxy-3-benzoylacetone, [Ln(l-moba)3(H2O)n] (Ln=La, Pr, Nd, Eu, Dy, Ho, Tm; n=0, 1, or 2), have been synthesized and characterized by elemental analyses, molecular weight determinations, and electronic, circular dichroism, and luminescence spectra. The molecular weight determinations suggest that the complexes are in a monomer-dimer equilibrium in nondonating solvents while they are monomeric in donating solvents. The complexes exhibit fairly intense circular dichroisms at the f-f band region, demonstrating the stereoselective formation of an enantiomer. The stereoselectivities have been discussed in terms of the intramolecular interligand CH/π-interaction operating between the phenyl and the menthyl groups of the ligands. [Eu(l-moba)3(H2O)] shows luminescence at the 5D0→7F1 and 5D0→7F2 transitions in benzene. Based on the concentration dependence of the luminescence, it is demonstrated that dimerization facilitates nonradiative relaxation and greatly reduces the quantum efficiency of luminescence.
The MCPBA-oxidation of 8H-Cyclohepta[b]thiophen-8-ones to Their 1,1-Dioxides and Further Ring-contracted Benzo[b]thiophene Derivatives
Authors: Takeshita Hitoshi , Motomura Hideshi , Mametsuka Hiroaki 
Published: July 2006

Abstract
Upon MCPBA-oxidation, several 8H-cyclohepta[b]thiophen-8-ones yielded the 8H-cyclohepta[b]thiophen-8-one 1,1-dioxides and their epoxides. The latters were shown to be convertible to several ring-contracted derivatives, the benzo[b]thiophene 1,1-dioxides and/or their corresponding phenol and salicylaldehyde derivatives.
Electroluminescent Properties of n-GaAs in Peroxodisulfate Solutions. Transient Behavior and Carrier Concentration Effect on Emission Spectra
Authors: Uosaki Kohei , Kita Hideaki 
Published: July 2006

Abstract
Electroluminescence (EL) due to band-to-band transition was observed for n-GaAs in solutions containing peroxodisulfate ions. Digital simulation shows that the observed transient current and EL intensity stimulated by negative potential pulses can be explained by assuming that the surface concentration of S2O82− was zero during potential pulses and that the EL intensity was proportional to the surface concentration of SO4\ewdot(generated by the one-electron reduction of S2O82−). Surface composition change seems to be the main reason for the relation between the potential and EL intensity. A hydrogen evolution reaction reduces the EL efficiency at relatively negative potentials. Although the potential and time had no observed effect on the shape of the EL spectra, the carrier concentration affected the peak position and the full width at half maximum (FWHM) of the EL spectra. For greater carrier concentrations, the wavelength of the EL peak became shorter and the FWHM became larger. These results agree with those reported regarding solid-state luminescence and can be explained by the filling of the conduction band states by electrons (Burnstein-Moss shift).
Enhanced Circular Dichroism and Phase Separation of Azobenzene-Containing Chiral Bilayer
Authors: Nakashima Naotoshi , Morimitsu Kozo , Kunitake Toyoki 
Published: July 2006

Abstract
An azobenzene-containing chiral amphiphile showed a drastic enhancement of circular dichroism (CD) due to formation of the rigid bilayer assembly. The drastic CD change was caused by phase transition of the matrix bilayer in the case of mixed bilayers with dihexadecyldimethylammonium bromide, but was caused by phase transition of the chiral component in the case of the single component bilayer. Both CD and absorption spectra of the azobenzene-containing chiral bilayer were used for detecting phase separation of mixed membranes. It was pointed out that the CD technique is widely applicable to phase separation studies.
The Structure of Liquid Water by Neutron Scattering. III. Calculations of the Partial Structure Factors
Authors: Ohtomo Norio , Tokiwano Kazuo , Arakawa Kiyoshi 
Published: July 2006

Abstract
A formula for obtaining partial structure factors for fluid systems composed of molecular clusters with various sizes was derived according to the theoretical procedure proposed in the preceding papers (N. Ohtomo, K. Tokiwano, and K. Arakawa, Bull. Chem. Soc. Jpn., 54, 1802 (1981): 55, 2788 (1982)). The formula was applied to calculate partial structure factors of liquid water, and from the good agreement between the calculated and observed values the pentamer–monomer mixture model for liquid water was confirmed as reasonable.
Polarized Raman and Phosphorescence Spectra of [1H4]- and [2H4]Pyrimidines
Authors: Umemoto Masayuki , Ogata Taketora , Shimada Hiroko , Shimada Ryoichi 
Published: July 2006

Abstract
Assignments of the out-of-plane normal vibrations of [1H4]- and [2H4]pyrimidines were reexamined through studies of the polarized Raman, time-resolved phosphorescence and polarized dark sublevel phosphorescence spectra. The vibrational analyses of the phosphorescence spectra based on their polarization behavior indicate that the appearance of the strong 0-0 and totally symmetric vibronic bands in the dark sublevel phosphorescence spectra is attributed to the distortion of the molecular structure along the b1 normal coordinates in the lowest triplet state.
Vibrational Distributions of CO+ (A) Produced from the Charge-transfer Reactions of Ne+ and He+ with OCS at Thermal Energy
Authors: Sekiya Hiroshi , Tsuji Masaharu , Nishimura Yukio 
Published: July 2006

Abstract
The Ne++OCS and He++OCS charge-transfer reactions have been studied by emission spectroscopy in a flowing afterglow. The relative vibrational populations of CO+(A2Π) were determined by observing the CO+(A2Π–X2Σ+) emission system produced from the above reactions. The populations decrease approximately exponentially with the vibrational quantum number.
Photoinduced Potential Changes across Poly(vinyl chloride)/Crown Ether Membranes. Membrane Potential in the Presence of Alkaline Earth Metal Cations
Authors: Anzai Jun-ichi , Sasaki Hiroshi , Ueno Akihiko , Osa Tetsuo 
Published: July 2006

Abstract
The potential change across poly(vinylchloride)/crown ether membrane was induced by photoirradiation in the presence of alkaline earth metal cations. The photoresponse of the membrane potential depended markedly on the kind and concentration of the cation species, the magnitude of the potential shift lying in the order of Mg2+&gt;Ca2+≈Sr2+&gt;Ba2+.
Preparatively Useful Method for the Synthesis of Diels-Alder Adducts between Furan and Methyl Acrylate
Authors: Kotsuki Hiyoshizo , Asao Kazuhiko , Ohnishi Hiroyuki 
Published: July 2006

Abstract
The Diels-Alder adducts of furan with methyl acrylate were successfully prepared by two methods on a preparative scale. The BF3·OEt2-catalyzed reaction of furan with methyl acrylate gave a 7:3 mixture of endo and exo adducts in 75.7% yield. When acryloyl chloride was used as a dienophile, after esterification with methanol, a 3:7 mixture of the same adducts was obtained in 76.5% overall yield.
Photoreaction of S-Butyl 3-Methoxy-2-butenethioate. Competitive 1,5-Methyl Migration and O-Demethylation
Authors: Hasegawa Tadashi , Iwasaki Kazuhiko , Yoshihara Nobutoshi 
Published: July 2006

Abstract
Irradiation of S-butyl (Z)-3-methoxy-2-butenethioate (1Z) gave the 1,5-methyl migration product 2 and the O-demethylation product 3. The photo-1,5-methyl migration occured competitively with the O-demethylation from the π, π* excited triplet state of 1Z. The migration product 2 underwent the secondary photoreaction to 3 in a nondegassed benzene solution.
Efficient Preparation of 3-Alkyl(or Aryl)thio-1(or 2)-propenyl p-Tolyl Sulfones
Authors: Ogura Katsuyuki , Iihama Teruyuki , Takahashi Kazumasa , Iida Hirotada 
Published: July 2006

Abstract
Synthetic routes from 3-chloro-1-propenyl p-tolyl sulfone to 3-(p-tolylthio)-1(or 2)-propenyl p-tolyl sulfone, 3-isopropylthio-1(or 2)-propenyl p-tolyl sulfone, and 3-methylthio-2-propenyl p-tolyl sulfone were exploited.
Deoximation of Oxime O-Acetates, Oximes, and Oxime Ethers by Nonacarbonyldiiron or Pentacarbonyliron. An Electronic Effect for the N–O Bond Cleavage
Authors: Nitta Makoto , Sasaki Ichiro , Miyano Hiroyuki , Kobayashi Tomoshige 
Published: July 2006

Abstract
The reaction of [Fe2(CO)9] or [Fe(CO)5] with oxime O-acetates, oximes, and oxime ethers under photoirradiation or thermal conditions undergoes deoximation to give the corresponding ketones. The oxime O-acetate was found to be the most reactive class of these compounds. A proposed mechanism involves an initial complexation of the [Fe(CO)4] species to the nitrogen atom of the oxime group, and the subsequent N–O bond cleavage to give an imido complex. Then the imido complex could collapse to the corresponding ketone via an imine intermediate in protic media.
O- and C-Perfluoroalkylations of Phenol System with (Perfluoroalkyl)phenyliodonium Triflates
Authors: Umemoto Teruo , Miyano Osamu 
Published: July 2006

Abstract
The reaction of FITS reagents with the phenols bearing bulky substituents at C-positions yielded O- and C-perfluoroalkylation products whose ratios were dependent on the steric bulkiness of the substituents or the perfluoroalkyl groups and the reaction temperature.
NQR of the 1 : 2 Molecular Complex of 1,4-Diazabicydo[2.2.2]octane with Chloroform
Authors: Negita Hisao , Suzuki Toshinori , Kubo Tsuneo , Maekawa Michio , Gima Shinei , Okuda Tsutomu 
Published: July 2006

Abstract
The 14N and 35Cl NQR and 14N spin-lattice relaxation have been studied at various temperatures on the 1 : 2 molecular complex of 1,4-diazabicyclo[2.2.2]octane (DABCO) with CHCl3. Two transitions have been observed near 123 K and 138 K. In the lowest temperature phase a minimum in the T1 was observed and attributed to the axial reorientation of DABCO molecules. The activation energy for this motion was determined to be 12.1±1.2 kJ mol−1. The electron population is discussed for the DABCO complexes with CHCl3 and CDCl3 using the Townes-Dailey treatment.
Behavior of Benzo-18-crown-6 Complexes with Alkali Metal Ions in Various Nonaqueous Solvents
Authors: Takeda Yasuyuki , Ohyagi Yoshihiko , Akabori Sadatoshi 
Published: July 2006

Abstract
The formation constants for 1 : 1 complexes of benzo-18-crown-6 (B18C6) with alkali metal ions and the solubility of B18C6 in various solvents were determined at 25 °C by conductometry and spectrophotometry, respectively. In general, the selectivity of B18C6 for alkali metal ions is governed primarily by the size relationship between cations and the B18C6 cavity. For a given alkali metal ion, the solvation ability of the solvent plays the most important role in determining stability sequences of the B18C6 complex in the solvents. Transfer activity coefficients of B18C6-alkali metal ion complexes were calculated. The transfer activity coefficient of the B18C6 complex from methanol to aprotic solvents somewhat varies with alkali metal ions in the B18C6 cavity. The magnitudes of the transfer activity coefficients of the B18C6 complex from acetonitrile and propylene carbonate to DMF and DMSO are determined mainly by the relative strength of the solvation ability of the former group and the latter group for the alkali metal ion in the B18C6 cavity. In methanol, due to the hydrogen bonds between ether oxygen atoms of B18C6 and methanol, the B18C6 complex is more strongly solvated than the corresponding alkali metal ion, compared to the case of the aprotic solvents.
A Study of the Charge-Discharge Characteristics of the Lithium–Polyacetylene Battery by Means of the FFT Impedance Measurement
Authors: Osaka Tetsuya , Kitai Takashi 
Published: July 2006

Abstract
The charge-discharge characteristics of the anion-doped lithium–polyacetylene [(CH)x] battery was investigated by means of the FFT impedance method, by which the impedance-frequency dispersion could be measured by very high speed. The charging and self-discharging of the Li–(CH)x battery were represented by the Randles-type equivalent circuit, added with the corrective term concerned with surface roughness. These processes and their doping states of the (CH)x film were readily detected by the variation in the resistive component, Rr, in the equivalent circuit. The Rr value of the self-discharge process was clearly correlated to the open-circuit voltage, Voc, regardless of the charging current; furthermore, it was strongly indicated that the self-discharge process is mainly caused by the dopant diffusion from the interface into the interior part of (CH)x films. For the discharging process, another mechanism, closely concerned with dopant diffusion, was suggested by the impedance results.
The Excited-state Absorption and Phosphorescence of Rhodium(III) Compounds at Room Temperature
Authors: Ohno Takeshi , Kato Shunji 
Published: July 2006

Abstract
The excited states of rhodium(III) compounds including [Rh(4,7-diphenyl-1,10-phenanthroline)3]3+ ([Rh(dp-phen)3]3+), [Rh(1,10-phenanthroline)3]3+ ([Rh(phen)3]3+), [RhCl2(dp-phen)2]+, and [RhCl2(phen)2]+, have been investigated by means of emission spectroscopy and laser photolysis spectroscopy. The transient species with the lifetime of 0.055–72 μs are identified as the triplet (π-π*) excited state of the ligand for [Rh(dp-phen)3]3+ and [Rh(phen)3]3+ and as the triplet ligand-field excited states for [RhCl2(dp-phen)2]+ and [RhCl2(phen)2]+. The molar absorption coefficients of the excited states are 9600 M−1 cm−1 at 550 nm for [Rh(dp-phen)3]3+, 2750 M−1 cm−1 at 560 nm for [RhCl2(dp-phen)2]+, 2300 M−1 cm−1 at 510 nm for [Rh(phen)3]3+, and 1600 M−1 cm−1 at 550 nm for [RhCl2(phen)2]+. The lifetime of the ligand-field excited state of [RhCl2(phen)2]+ (700 ns in acetonitrile) decreases to 55 ns in water.
Mercury- and Cadmium-photosensitized Reactions of γ-Butyrolactone
Authors: Yamamoto Shunzo , Matsuda Shuzo , Ozaki Chihiro , Takahoso Hiroshi , Nishimura Norio 
Published: July 2006

Abstract
The mercury- and cadmium-photosensitized reactions of γ-butyrolactone have been compared. The products obtained in the two photosensitizations were quite different. The gaseous products from the mercury-photosensitized reaction were carbon dioxide, cyclopropane, and propylene, while the products obtained in the cadmium-photosensitized reaction were carbon monoxide and ethylene. This difference suggests that the decomposition of γ-butyrolactone takes place through different intermediates in the two reactions. Possible mechanisms are discussed.
The Dispersion Stability of Colloidal Particles in Dioxane–Water Mixtures
Authors: Kandori Kazuhiko , Kon-no Kijiro , Kitahara Ayao 
Published: July 2006

Abstract
The dispersion stability of titanium dioxide particles and two kinds of iron(III) oxide particles in dioxane–water mixtures was studied as a function of the dielectric constant(ε=2.2–78). The sedimentation of dispersions, the adsorption of sodium 1,2-bis(2-ethylhexyloxycarbonyl)ethanesulfonate (Aerosol OT or AOT) on the particles, and the zeta potential were measured. In the absence of AOT, the dispersions of all the particles were rapidly flocculated over all of the region of the dielectric constant, and little effect of the dielectric constant on the dispersibility was observed. In the presence of AOT, however, the dispersions of all the kinds of particles used were stabilized at both the lower(ε=2.2) and higher(ε=60–78) regions of the dielectric constant by the adsorption of AOT on the particles. However, the flocculation was accelerated for all kinds of particles, and AOT molecules were not at all, or scarcely, adsorbed on the particles in the middle region of the dielectric constant(ε=10–50). This behavior of the dispersibility corresponded with the results of the dynamic light scattering of the AOT solution, which reveal the aggregation of AOT molecules at various dielectric constants. The zeta potential changed from a positive sign to a negative sign with the increase in the dielectric constant, and the isoelectric dielectric point (IED), which means a zero value of the zeta potential, appeared. The order of the values of IED among the three kinds of particles agrees with the order of the isoelectric points(IEP) of the particles. This result can, therefore, be explained by the concept of the acid-base interaction between a particle and a solvent in dioxane–water mixtures.