bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Crystal Structure and Physical Properties of the 3:2 Charge Transfer Complex of Bis(ethylenedithio)dithiapyrene (ETDTPY) and Dibenzobarrelenotetracyanoquinodimethane (DBBTCNQ)
Authors: Toyoda Jiro , Nakasuji Kazuhiro , Kotani Tomoyuki , Murata Ichiro , Kawamoto Atsushi , Tanaka Jiro 
Published: May 2006

Abstract
The V-shape correlation between hvcr and ΔEo,r of the charge transfer complexes is convenient to judge the gross features of the solid state properties. Using this correlation, we found the 3:2 charge transfer complex of bis(ethylenedithio)dithiapyrene (ETDTPY) and dibenzobarrelenotetracyanoquinodimethane (DBBTCNQ) which showed the columnar structure of alternating trimeric stack of the donor and dimeric stack of the acceptor.
Multi-Point Interaction of Phosphates with Protonated Pyridylporphyrin. Discrimination of Monoalkyl and Dialkyl Phosphates
Authors: Aoyama Yasuhiro , Nonaka Shin-ichi , Motomura Tadahiro , Toi Hiroo , Ogoshi Hisanobu 
Published: May 2006

Abstract
The rigid and unique polyammonium binding site of fully protonated 5,15-bis(2-pyridyl)octaethylporphyrin allows novel discrimination of monoalkyl phosphate vs. dialkylphosphate as well as oxy- and dicarboxylic acids vs. monocarboxylic acid; the former are readily bound with the protonated porphyrin via multi-point interaction, while the latter not.
Chromatographic Separation of Light Rare Earth Metal Ions on Polyacryloylacetone Chelating Resin
Authors: Tomida Tahei , Inagawa Keiji , Masuda Seizo 
Published: May 2006

Abstract
The chromatographic separation of La(III) from other light rare earth metal ions [Ce(III), Pr(III), Nd(III), Sm(III)] was achieved by using polyacryloylacetone as a stationary phase. High resolutions were obtained when pH of the eluent (HCl) was decreased stepwise.
Self-aggregates of Hydrophobic Polysaccharide Derivatives
Authors: Akiyoshi Kazunari , Yamaguchi Shigehiko , Sunamoto Junzo 
Published: May 2006

Abstract
Hydrophobic polysaccharide derivatives bearing palmitoyl or cholesterol moieties form self aggregates in an aqueous solution. The critical concentrations to give the polymer aggregates depended on the degree of substitution of the hydrophobic moiety. Cholesterol-bearing pullulan showed a stronger binding for hydrophobic guest molecules and higher colloidal stability compared with the corresponding palmitoyl-bearing one.
Electroluminescence from Polysilane Film Doped with Europium Complex
Authors: Kido Junji , Nagai Katsutoshi , Okamoto Yoshiyuki , Skotheim Terje 
Published: May 2006

Abstract
Electroluminescent devices with poly(methylphenylsilane) film doped with Eu3+ complexes were fabricated. The cell structure of glass substrate/indium-tin-oxide/polysilane/electron transport layer/Mg/Ag was employed. Sharp red electroluminescence of europium ion was obtained at dc bias voltage of over 12 V.
Synthesis of a Simple Model Compound of Dynemicin and Cycloaromatization with Pinacol-Pinacolone Rearrangement in the Strained Enediyne Medium Ring
Authors: Nishikawa Toshio , Ino Akira , Isobe Minoru , Goto Toshio 
Published: May 2006

Abstract
Novel bicyclo[7.3.1]-tridecadiyne system included in dynemicin was synthesized from a quinoline aldehyde in 9 steps. Key step was the cyclization with silyl acetylene to ketone carbonyl group through fluoride activation with CsF. The cyclized compound did aromatize under acidic condition, with opening of the epoxide ring, to give a Bergman product that was further converted with pinacol-pinacolone rearrangement.
Ruthenium Complex-Catalyzed Facile Synthesis of 2-Substituted Benzo-azoles
Authors: Kondo Teruyuki , Yang Sungbong , Huh Keun-Tae , Kobayashi Masanobu , Kotachi Shinji , Watanabe Yoshihisa 
Published: May 2006

Abstract
Ruthenium complex shows high catalytic activity for the reaction of 2-aminophenol with primary alcohols to give the corresponding 2-substituted benzoxazoles in high yields. Similarly, 2-substituted benzimidazoles are also synthesized readily by the ruthenium catalyzed reaction of 1,2-phenylenediamine with primary alcohols.
New Liquid Crystals with a Flexible Benzyloxytropone Core
Authors: Mori Akira , Taya Hisashi , Takeshita Hitoshi 
Published: May 2006

Abstract
2-Benzyloxytropones showed a monotropic smectic A phase while the corresponding alkoxybenzyl alkoxyphenyl ethers were nonmesogenic. The tropone carbonyl group acting as a dipolar lateral substituent enhanced the smectic thermal stability.
Electrocatalytic Oxidation of Thiols on a TEMPO Modified Electrode
Authors: Kashiwagi Yoshitomo , Ohsawa Akio , Osa Tetsuo , Ma Zhenkun , Bobbitt James M 
Published: May 2006

Abstract
Monothiols were oxidized efficiently and quantitatively to disulfides on graphite felt electrode coated with 4-amino-2,2,6,6-tetramethylpiperidinyl-1-oxyl (4-amino-TEMPO). The 4-amino-TEMPO was immobilized through an amide linkage with poly(acrylic acid). The poly(acrylic acid) was cross-linked with 1,6-diaminohexane, and the residual carboxyl groups were methylated with diazomethane. The electrode was stable and could be used repeatedly.
Mass Spectral Fragmentations of Polysilanylalkanols. The Analogies between Mass Spectrometry and Photo-Induced Electron Transfer
Authors: Nakadaira Yasuhiro , Otani Shinju , Kyushin Soichiro , Ohashi Mamoru , Sakurai Hideki , Funada Yasuhito , Sakamoto Kenkichi , Sekiguchi Akira 
Published: May 2006

Abstract
The mass spectra of polysilanylalkanols can be rationalized on the basis of their characteristic reactions under photo-induced electron transfer reactions.
Cation-Specific Ionic Conductivity of Polymer Composite Films Incorporating a Crowned Azobenzene Derivative
Authors: Kimura Keiichi , Hirao Motokazu , Yokoyama Masaaki , Sato Mamoru 
Published: May 2006

Abstract
Polymer composite films consisting of a polyester elastomer, NaClO4 or LiClO4, and a lipophilic azobenzene derivative containing monoaza-15-crown-5 moiety exhibited higher ionic conductivity than did a similar film containing KClO4, reflecting the ion specificity for cation complexation of the crowned azobenzene itself. The NaClO4- and LiClC4-containing composite films possessed significant domains consisting of aggregates of the crowned azobenzene.
A New Alkoxyiodination and Nitratoiodination of Olefins Using lodine-Cerium(IV) Ammonium Nitrate
Authors: Horiuchi C Akira , Nishio Yoshihiko , Gong Dan , Fujisaki Takanori , Kiji Shinji 
Published: May 2006

Abstract
Reactions of cycloolefins with iodine-cerium(IV) ammonium nitrate in alcohols (methanol, ethanol, 1-propanol, and 2-propanol) under reflux gave the corresponding vicinal alkoxyiodocycloalkanes in good yields. In the case of t-butyl alcohol, trans-iodo nitrates were obtained.
Tetranuclear Copper(I)-Based Infinite One-Dimentional Chain Complex. Synthesis and X-Ray Crystal Structure of {[Cu2(μ-3-methylpyridazine)2(μ-pyrazine)3](ClO4)2}∞
Authors: Kitagawa Susumu , Munakata Megumu , Tanimura Tadashi 
Published: May 2006

Abstract
The title copper(I) compound has been isolated, whose X-ray crystallographic structure shows a rare polymerization mode in which the tetranuclear copper units, composed of three- and two-coordinate copper(I) atoms, are linked by pyrazines. This gives a cyclic voltammogram and a chrage transfer band characteristic of the polymeric structure in the solid state.
Enhanced Polymer Transport Due to the Presence of Salts in Multicomponent Convection
Authors: Maeda Hiroshi , Mashita Takehiro , Sasaki Shigeo 
Published: May 2006

Abstract
Transport rate of poly(vinylpyrrolidone) in aqueous dextran matrix was enhanced by the addition of CsCl or NaCl but not by LiCl. This enhancement can be partly attributed to a decrease in hydrodynamic resistance.
Synthesis of (−)-Neoanisatin, a Neurotoxic Sesquiterpenoid Having a Novel Spiro β-Lactone
Authors: Niwa Haruki , Yamada Kiyoyuki 
Published: May 2006

Abstract
(−)-Anisatin can be converted into (−)-neoanisatin, which accomplishes the total synthesis of the natural enantiomer of neoanisatin.
Preparation of 1,4-Dienes from 2-(2-Hydroxyalkylseleno)benzothiazoles by the Reaction involving Se→O Aza-aromatic Ring Rearrangement
Authors: Shibata Koichi , Shiono Hirofumi , Mitsunobu Oyo 
Published: May 2006

Abstract
The reaction of 2-(acylmethylseleno)benzothiazoles with allylic Grignard reagents in the presence of BF3·OEt2 gave the corresponding 2-(2-hydroxyalkylseleno)benzothiazoles which, on treatment with NaH and Ph3P, afforded 1,4-dienes in good to excellent yields.
Unusual Bonding in the Isomers of 6,7,13a,13b-Tetrahydro-6H-dipyrido[l,2-a:2′,1′-c][1,4]diazepine
Authors: Toyota Azumao , Muramatsu Takashi , Hanaya Kaoru , Ikegami Yusaku 
Published: May 2006

Abstract
MNDO studies on the titled compound reveal that the most stable meso and dl conformers possess an extremely long CC single bond, the latter being lower in energy than the former by 4.9 kJ/mol. Available experimental results are explained by the characteristic molecular properties.
Alcohol-Incorporated Photoaddition of Alkenes to 1,2-Naphthalenedicarboxylic Anhydride
Authors: Kubo Yasuo , Tanaka Yoshiaki , Araki Takeo 
Published: May 2006

Abstract
Irradiation of 1,2-naphthalenedicarboxylic anhydride (1) with alkenes in methanol-benzene or in methanol-acetonitrile gave methanol-incorporated adducts at a carbonyl carbon atom in 1 and those at a naphthalene ring carbon atom in 1.
Enhancement Effect of Pentafluorophenol on the Liquid-Liquid Partition of Tris(acetylacetonato) Complexes of Chromium(III) and Cobalt(III)
Authors: Katsuta Shoichi , Imura Hisanori , Suzuki Nobuo 
Published: May 2006

Abstract
The partition coefficient of tris(acetylacetonato)-chromium(III) and -cobalt(III) (M(acac)3) between heptane and aqueous solutions was remarkably enhanced by the presence of pentafluorophenol (PFP). This effect was ascribed to the formation of the hydrogen-bonded association complexes, M(acac)3·PFP and M(acac)3·PFP, in the organic phase, and the association constants were determined.
Formation of a Tricyclic [2.2]Paracyclophane Derivative in the Low-Temperature Photoreaction of an Unsymmetric Diolefin Crystal
Authors: Chung Chan-Moon , Nakamura Fumihiko , Hashimoto Yukihiko , Hasegawa Masaki 
Published: May 2006

Abstract
Propyl α-cyano-4-[2-(4-pyrimidyl)ethenyl]cinnamate crystal afforded a tricyclic [2.2]paracyclophane derivative upon photoirradiation at low temperatures even though it gave a monocyclic dimer and oligomers at room temperature. This result is very significant in understanding of photochemical behavior of organic crystals at low temperature and in development of a new synthetic route of highly strained [2.2]paracyclophane derivative.
Structural Phase Transitions of the Polymorphs of CsSnI3 by Means of Rietveld Analysis of the X-Ray Diffraction
Authors: Yamada Koji , Funabiki Shinya , Horimoto Hiromi , Matsui Takashi , Okuda Tsutomu , Ichiba Sumio 
Published: May 2006

Abstract
The successive phase transitions of the polymorphs of CsSnI3 were studied by means of the powder X-ray diffraction and their crystal structures were analyzed at three different temperatures by the Rietveld method.
Effect of Substituents on the Triple Ion Formation from Various Ammonium or Guanidium Chlorides
Authors: Hojo Masashi , Miyauchi Yoshihiro , Ide Natsuo , Imai Yoshihiko 
Published: May 2006

Abstract
The triple ion formation from various ammonium or guanidium chlorides has been examined by conductometry in acetonitrile, benzonitrile, and propylene carbonate. The observed minimum in the Λ−C1/2 curve of diethylcyclohexylammonium chloride in benzonitrile could be reproduced in terms of a large formation constant of quadrupole complexes by computer simulations.
The Ozone-Mediated Reaction of Nonactivated Arenes with Nitrogen Oxides
Authors: Suzuki Hitomi , Murashima Takashi , Shimizu Kazuhiro , Tsukamoto Kenkichi 
Published: May 2006

Abstract
In the presence of ozone and appropriate catalyst, nitrogen oxides (NO, N2O3, and NO2) exhibit strong nitrating ability, converting nonactivated arenes into the corresponding nitro derivatives in good to moderate yields.
Bi–Pd Catalyst for Selective Hydrodechlorination of 1,1,2-Trichlorotrifluoroethane to Trifluoroethene, a Key Intermediate to 1,1,1,2-Tetrafluoroethane as a CFC Replacement for Refrigeration
Authors: Ohnishi Ryuichiro , Suzuki Isao , Ichikawa Masaru 
Published: May 2006

Abstract
Trifluoroethene, a key intermediate to 1,1,1,2-tetrafluoroethane (FC-134a), was catalytically synthesized with 80–90% selectivity at 80–100% conversion in the hydrodechlorination of 1,1,2-trichlorotrifluoroethane(FC-113) at 200–250 °C under an atmospheric pressure over Bi–Pd (Bi/Pd = 0.4–0.6) supported on metal oxides.
On-Line Elimination of Electroactive Interferents for Flow-Type Electrochemical Biosensor System
Authors: Okawa Yusuke , Kobayashi Hiroyuki , Ohno Takashi 
Published: May 2006

Abstract
A flow-through electrolytic cell (electrochemical filter; ECF) was newly designed for the elimination of electroactive interferents with electrochemical biosensors. The ECF has been combined with a glucose oxidase monolayer electrode in a flow injection analysis (FIA) setup. The addition of ferricyanide to the carrier buffer drastically increased the elimination efficiency for L-ascorbic acid and the biosensor output. Glucose content in soft drinks has been determined without any pretreatment.
Reversal Phenomena of the Preferential Activation of Aldehydes to the Corresponding Acetals under Non-Basic Conditions. The Chemoselective Aldol Reaction of Aldehydes with t-Butyldimethylsilyl Enol Ethers Using TBSCl–INCl3 as a Catalyst
Authors: Mukaiyama Teruaki , Ohno Takashi , Sik Han Jeong , Kobayashi Shu 
Published: May 2006

Abstract
In the presence of a catalytic amount of t-butyldimethylsilyl chloride (TBSCl) and indium(III) chloride (InCl3), aldehydes smoothly react with t-butyldimethylsilyl enol ethers to afford the corresponding aldol adducts in good yields whereas acetals do not react under the same reaction conditions.
Chiral Polypeptide Monolayers from Self-Condensation of Amphiphilic Amino Acid Ester. Effect of Chirality on the Membrane Structure
Authors: Miyasaka Tsutomu , Nishikawa Naoyuki , Orikasa Atsushi , Ono Mitsunori 
Published: May 2006

Abstract
A Chiral polypeptide monolayer was prepared by self-condensation of an amphiphilic (S)-serine phenyl ester on an aqueous subphase. The monolayer film gave a two-dimensional structure markedly different from that of racemic analogues, reflecting the effect of molecular recognition of chirality in the lateral self-condensation process.
Hydrogen Source in the Photochemical Cobalt–Carbon Cleavage of Hydrophobic Vitamin B12 Derivatives in Hydrophobic Microenvironments
Authors: Murakami Yukito , Hisaeda Yoshio , Song Xi-Ming , Takasaki Kenji , Ohno Teruhisa 
Published: May 2006

Abstract
The photolysis of a hydrophobia vitamin B12 with a benzyl moiety at the Coβ site was carried out in a D2O solution containing single-walled vesicles, and a major product was the non-deuterated toluene. A hydrogen atom was apparently abstracted from the hydrophobic vitamin B12 or a lipid molecule, and not from bulk water.
An Efficient Method for the Stereoselective Synthesis of 1,2-cis- and 1,2-trans-Ribofuranosides from 1-Hydroxy Ribofuranose by the Use of Diphenyltin Sulfide and Trifluoromethanesulfonic Anhydride
Authors: Mukaiyama Teruaki , Matsubara Koki , Suda Shinji 
Published: May 2006

Abstract
1,2-trans-Ribofuranosides are stereoselectively synthesized in high yields directly from 1-hydroxy ribofuranose and trimethylsilylated nucleophiles by the use of diphenyltin sulfide and trifluoromethanesulfonic anhydride. Even further, in the coexistence of lithium perchlorate, 1,2-cis-ribofuranosides are prepared predominantly in high yields.
Oxidative Decomposition of Methyl Linoleate by a Lipoxygenase Model Iron Complex Fe((pz)3BH)2
Authors: Tachibana Masahiko , Sasaki Ken , Ueda Akihiro , Sakai Mutsuji , Sakakibara Yasumasa , Ohno Atsuyoshi , Okamoto Tadashi 
Published: May 2006

Abstract
Highly effective aerobic oxidation of methyl linoleate was induced by ferrous pyrazolylborate complex in dichloromethane solution for the mimesis of lipoxygenase reaction.
Desorption Behavior of Cd, Zn and Pb Sorbed on Hydroxyaluminum- and Hydroxyaluminosilicate-Montmorillonite Complexes
Authors: Saha Uttam Kumar , Iwasaki Kōzō , Sakurai Katsutoshi 
Published: May 2006

AbstractThere is a clear gap in the understanding of the desorption patterns of metals sorbed on soils and clays, despite their importance in the mobility, transport and fate of metals in natural environments. In this study, we investigated the desorption behavior of Cd, Zn and Pb sorbed on montmorillonite (Mt) and on hydroxyaluminum (HyA)- and hydroxyaluminosilicate (HAS)-Mt complexes. At pH 6.5, 2.5 g L–1 of HyA-Mt and HAS-Mt sorbed almost all of the 10–6 M Cd, Zn or Pb, while Mt under the same condition sorbed ~48, 49 and 55% of the added Cd, Zn and Pb, respectively. Based on pH50 values, the selectivity of metal sorption on Mt was Pb > Zn > Cd, and on the complexes, it was Pb ≫ Zn = Cd. In general, larger fractions of sorbed metals were remobilized from Mt than from the complexes. Again, in comparison with Pb, larger fractions of sorbed Cd and Zn were remobilized from different clays. Reducing the pHs of the equilibrium sorption systems from a fixed point (6.5) to different points (6.0, 5.5, 5.0, 4.5, and 4.0) and from different points (6.5, 6.0, 5.5, 5.0, and 4.5) to a fixed point (4.0) both yielded hysteretic metal desorption patterns. The fractions of Cd and Zn desorbed through Na and Cu exchange from the clays, especially from the complexes, were very different, indicating the existence of cation exchangeable metal sorption sites of weak and strong affinities on the complexes. Based on the EDTA-extractable fractions of Cd and Zn from HAS–Mt and HyA-Mt, it appeared that HyA–metal bonds are stronger than the HAS–metal bonds. Compared with other agents, acetic acid remobilized the highest fractions of all metals irrespective of the type of clays, with a concomitant release of Al or Al + Si. The Pb-HyA/HAS-Mt bonds were, however, still much too strong to be broken substantially by this mechanism. The results accomplished in this study suggest further attention to the fundamental understanding of the mobility, fate, bioavailability and toxicity of the concerned metals in soils and related environments.
Anomalous Reverse Zoning of Saponite and Corrensite Caused by Contact Metamorphism and Hydrothermal Alteration of Marly Rocks Associated with Subvolcanic Bodies
Authors: Abad Isabel , Jiménez-Millán Juan , Molina José Miguel , Nieto Fernando , Vera Juan Antonio 
Published: May 2006

AbstractThe effects of a subvolcanic intrusion on its host rocks in the Priego de Córdoba area (SE Spain) was studied by optical microscopy, X-ray diffraction and electron microscopy. The intrusion of a laccolith of stratiform dolerite in partially consolidated marly sediments at quite shallow depths below the ocean floor took place during the intracontinental rifting phase of the Subbetic zone of the Betic Cordilleras. In the first stage, contact metamorphism caused the crystallization of calc-silicate consisting of grossular andradite garnet, diopside, vesuvianite and titanite for which the upper temperature limit was 500°C. Phyllosilicates are found in a network of veins cross-cutting the carbonate and calc-silicate matrix, indicating their formation during a process of hydrothermal alteration superimposed on the contact aureole. In the area closest to the subvolcanic rocks, saponite is the main phyllosilicate although some dispersed chlorite is found. In the zone furthest from the contact, corrensite together with saponite and beidellitic smectites were observed. The presence of low-temperature phases (saponite) in the area closest to the laccolith reveals the evolution of the hydrothermal system toward cooler conditions. In the early stage, the circulation of a hot hydrothermal fluid caused the crystallization of chlorite in the area surrounding the subvolcanic body and corrensite in the more distal area, which might have begun even during the contact metamorphism stage. A cooling phase followed, resulting in the crystallization of saponite in the host rocks, and the crystallization of dioctahedral and trioctahedral smectites inside the subvolcanic body.
Synthesis of Cu-Containing Layered Double Hydroxides with a Narrow Crystallite-Size Distribution
Authors: Feng Yongjun , Li Dianqing , Li Chunxi , Wang Zihao , Evans D. G. , Duan Xue 
Published: May 2006

AbstractHydrotalcite-like layered double hydroxides (LDHs) containing different ratios of Ni2+, Cu2+, Mg2+ and Al3+ in the layers have been prepared by a new method, the key features of which are a very rapid mixing and nucleation process in a colloid mill followed by a separate ageing process. The compositions and structural parameters of the materials synthesized using the two routes are very similar, although the degree of crystallinity is slightly higher for the LDHs produced using the new method. The major advantage of the new method is that it produces smaller crystallites, having a very narrow range of distribution of crystallite size. In the conventional coprecipitation process at constant pH, the mixing process takes a considerable time during which nuclei formed at the beginning of the process have a much longer time to undergo crystal growth than those formed at the end of the process. The consequence is that a wide dispersion of crystallite sizes is obtained. In the colloid mill process, however, the mixing and nucleation is complete in a very short time and is followed by a separate ageing process.
Formation of Nontronite from Oxidative Dissolution of Pyrite Disseminated in Precambrian Felsic Metavolcanics of the Southern Iberian Massif (Spain)
Authors: Fernández-Caliani J. C. , Crespo E. , Rodas M. , Barrenechea J. F. , Luque F. J. 
Published: May 2006

AbstractThis paper describes a rare occurrence of nontronite associated with sulfide-bearing felsic metavolcanics, providing evidence of colloidal deposition in open spaces as result of a low-temperature water-rock interaction. Microbotryoidal masses of green nontronite with impurities of kaolinite, illite, barite, amorphous silica and iron oxyhydroxides are found as vein and cavity fillings in deeply kaolinized rhyolites and rhyolitic tuffs of Precambrian age, at Oliva de Merida in SW Spain. Clay mineral characterization has been carried out by X-ray diffraction, infrared spectroscopy, thermal analysis, analytical electron microscopy and stable isotope (oxygen and hydrogen) analysis. Nontronite was formed under low-temperature alteration conditions, from a continuous sequence of reactions and aqueous solution compositions, involving two basic processes that acted in concert: oxidative dissolution of pyrite and hydrolysis of K-feldspar. After acidity neutralization, dissolved silica released by incongruent dissolution of K-feldspar reacted with ferric sulfate derived from pyrite oxidation to form nontronite under oxidizing conditions, in the presence of relatively warm meteoric water.