bluuebunny/crossref_metadata_2025 huggingface dataset:
An 8-Aminoquinoline-Based Langmuir–Blodgett Film Sensor of Cu(II) Ion
Authors: Ouyang Jian-Ming , Xue Ping- , Ngan Hei-Ieng , Zheng Wen-Jie , Lu Zu-Hong , Hong Qing-Yue
Published: September 2002

A new amphiphilic bis-amide tetradenate ligand, N, N′-bis(8-quinolinyl)dodecylpropanediamide, H2A, was prepared and formed monolayer. The interactions between H2A monolayers and metal ions (Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Mg2+, Cd2+, Hg2+, Pb2+, and La3+) were investigated. Only Cu2+ ion showed special coordination with H2A. It was proved by means of XPS. The selective copper binder of the Langmuir–Blodgett film of H2A may be developed as a sensor of copper ion.
Effect of Lanthanum Ions on the Photoelectrochemical Response of Bacteriorhodopsin
Authors: Saga Yoshitaka , Ishikawa Tomoko , Watanabe Tadashi
Published: September 2002

Lanthanum ions (La3+) drastically changed the pH dependence of the photocurrent responses from bacteriorhodopsin (bR). The pH value of the photocurrent polarity reversal was shifted to lower pH and the ratio of the light-off to the light-on photocurrent peak intensities, Ioff/Ion, was significantly decreased, compared with the photoresponse from the wild-type bR. These results are explained by invoking the effect of La3+ on the bR proton pump activity.
Spiropyran as a Regulator of DNA Hybridization with Reversed Switching Mode to That of Azobenzene
Authors: Asanuma Hiroyuki , Shirasuka Kenji , Yoshida Takayuki , Takarada Tohru , Liang Xingguo , Komiyama Makoto
Published: September 2002

The nitrospirobenzopyran, tethered at the 5′-end of the homothymidine, was thermally isomerized to colored merocyanine, which was converted reversibly to colorless spiropyran by visible light irradiation (λ > 490 nm). Concurrently with the spiropyran→merocyanine isomerization, melting temperature of the duplex with its complementary oligonucleotide was changed from 18.0 °C to 21.6 °C.
Solvent-Free Coumarin Synthesis
Authors: Sugino Teizo , Tanaka Koichi
Published: September 2002

The synthesis of coumarins via Pechmann and Knoevenagel condensation reactions under solvent-free conditions is reported, in which waste minimization, simple operation and easier product work-up can be achieved.
Purification of Ammonia-Containing Water by Catalytic Selective Decomposition with Novel Pd-Supported Zirconia
Authors: Taguchi Junji , Yoshinaga Yusuke , Okuhara Toshio
Published: September 2002

Pd-Supported ZrO2 prepared through a hydrothermal treatment was found to be pronouncedly effective for purification of waste water containing ammonia; NH3 (1000 ppm) was exclusively converted to N2 at 433 K in the presence of O2 and undesirable NO2− and NO3− were not detected. It was further demonstrated that the Pd/ZrO2 was insoluble during the reaction and was reusable without any treatment.
Photoelectron Spectroscopy of Scandium-Arene Complex Anions
Authors: Judai Ken , Nakamura Yoshiaki , Tachibana Makoto , Negishi Yuichi , Nakajima Atsushi , Kaya Koji
Published: September 2002

Scandium-arene complex anions, Sc1(arene)m− (m = 1, 2; arene = benzene and toluene) were generated by the gas phase reaction of laser vaporized atoms with aromatic molecules. Sc1(toluene)2− was identified as a sandwich complex anion in the gas phase. The electronic structures of the complex anions were observed by photoelectron spectroscopy.
Conformational Effect of a Lateral Alkoxy Group on Mesomorphic Properties
Authors: Wu Jianwei , Okamoto Hiroaki , Takenaka Shunsuke
Published: September 2002

The mesomorphic properties of some homologs of 4-(4-alkoxyphenoxycarbonyl)phenyl 3-alkoxybenzoate (1), 3-alkoxy-4-methylbenzoate (2), and 3-alkoxy-2-methylbenzoate (3) were examined. Except the methoxy homolog, 1 are non-mesogenic, but 2 and 3 tend to exhibit a nematic phase. The nematic-isotropic transition temperature decreases in the order of 3 > 2 > 1. The unusual mesomorphic properties are discussed in terms of the conformational effect of the alkoxy group.
A Convenient Method for the Preparation of Unsymmetrical Bis-Aldols by Way of Sequential Two Aldol Reactions
Authors: Arai Hidehiro , Shiina Isamu , Mukaiyama Teruaki
Published: September 2002

Unsymmetrical alkyl 2-hydroxy-1-(1-hydroxyalkyl)alkyl ketones (bis-aldols) are successfully synthesized by way of sequential two aldol reactions using α-bromo ketones and two different aldehydes. In the first reaction, α-bromo-β-stannyloxy ketones are formed by tin(II) trifluoromethanesulfornate-promoted aldol reaction of α-bromo ketones with several aldehydes. Bis-aldols are then formed via the second aldol reaction between another aldehydes and dianionic enolates generated by the reduction of α-bromo-β-metalloxy ketones with titanium(IV) iodide and copper.
Preparation of Microporous Ga–Si–O Materials with Acidic Sites from a Gallium-Bridged Silsesquioxane
Authors: Wada Kenji , Yamada Koichi , Kondo Teruyuki , Mitsudo Take-aki
Published: September 2002

Ga–Si–O materials with acidic sites and uniformly-controlled micropores have been prepared by the calcination of a new gallium-bridged silsesquioxane [HNEt3]+[Ga{(Me3Si)(c-C5H9)7Si7O12}2]−.
Reaction of a Sulfur Bridged Incomplete Cubane-Type Tungsten Cluster with Acetylene: Formation of Three Carbon–Sulfur Bonds
Authors: Maeyama Masataka , Shibahara Takashi
Published: September 2002

The reaction of sulfur-bridged isothiocyanate tungsten cluster [W3(µ3-S)(µ-S)3(NCS)9]5− (5) with acetylene affords a novel complex having two acetylene molecules of different coordination modes, [W3(µ3-S)(µ3-SCH=CHS)(µ-SCH=CH2)(NCS)9]4− (6), and the presence of two kinds of intermediates [W3(µ3-S)(µ-S)(µ3-SCH=CHS)(NCS)9]5− (7) and [W3(µ3-S)(µ-S)2(µ-SCH=CH2)(NCS)9]4− (8) are suggested. They are characterized by X-ray crystallography (for 6) and 1H NMR spectroscopy (for 6, 7, and 8).
Characterization of Microporous Copper(II) Dicarboxylates (Fumarate, Terephthalate, and trans-1,4-Cyclohexanedicarboxylate) by Gas Adsorption
Authors: Seki Kenji , Takamizawa Satoshi , Mori Wasuke
Published: September 2002

Some microporous coordination polymers have been synthesized from copper salts and dicarboxylic acids. These stuctures were characterized by gas adsorption methods. The methane adsorption capacities of these coordination polymers were measured under high pressure. The measurement disclosed that these coordination polymers had uniform micropores and methane adsorption capacities almost the same as that of zeolite 5A.
Novel Insight into the Photochromism and Thermochromism of Hydrogen Bonded Schiff Bases
Authors: Suzuki Toshihide , Arai Tatsuo
Published: September 2002

The equilibrium between the enol form and the keto form in the triplet state of salicylideneanilines and salicylidenebenzylamines 1 in non-polar solvent has been explored based on the observation of phosphorescence and T–T absorption spectra.
Primary Processes in Photochromic Reaction of 4-Diethylamino-4′-dimethylamino-2-hydroxychalcone in Toluene
Authors: Tokumura Kunihiro , Taniguchi Naoto , Kimura Takashi , Matsushima Ryoka
Published: September 2002

A photochromic behavior was found for trans-4-diethylamino-4′-dimethylamino-2-hydroxychalcone in toluene, and colored species undergoing dark reaction to regenerate trans-isomer may be ascribed to cis-isomer with the lifetime of 77 min at room temperature. It is demonstrated that a trans→cis isomerization in the lowest triplet state is significantly responsible for the primary process of the coloration.
High Density Adsorption of Porphyrins onto Clay Layer without Aggregation: Characterization of Smectite-Cationic Porphyrin Complex
Authors: Takagi Shinsuke , Shimada Tetsuya , Yui Tatsuto , Inoue Haruo
Published: September 2002

Adsorption of the +4 charged cationic porphyrins onto an artificially synthesized smectite was studied. Porphyrin molecules adsorb on the clay sheet with high density to neutralize all the minus charges of the clay surface without aggregation by a novel method of a size-matching of distances between the charge sites. An efficient energy transfer between different porphyrins was induced on the clay surface, while there was no interaction in the ground state.
Chloride Ion Conducting Characteristics in Rare Earth Oxychlorides
Authors: Imanaka Nobuhito , Okamoto Koji , Adachi Gin-ya
Published: September 2002

Chloride ion (Cl−) conducting characteristics were investigated in calcium doped lanthanum oxychlorides which show a high stability even in a high humid atmosphere and at an elevated temperature. The Cl− ion conductivity of the oxychloride is approximately 10−4.5 S·cm−1 at 700 °C and the Cl− ion transference number is almost unity. The development of new types of Cl− ion conducting solid electrolytes with a high durability opens a door to realize a new application for functional materials.
Statistical Characterization of Nonbonded S···O Interactions in Proteins
Authors: Iwaoka Michio , Takemoto Shinya , Okada Mai , Tomoda Shuji
Published: September 2002

Weak nonbonded S···O interactions were characterized as stabilizing forces of protein structures based on the database analysis of selected heterogeneous structures in Protein Data Bank (PDB) as well as quantum chemical calculations at MP2/6-31G(d).
Conducting Langmuir–Blodgett Films of Bis[bis(methylthio)tetrathiafulvalenedithiolate]-gold Complex
Authors: Nakamura Takayoshi , Takahashi Toshiyuki , Yumoto Toru , Akutagawa Tomoyuki , Hasegawa Tatsuo
Published: September 2002

Single-component Langmuir–Blodgett films of a dithiolate complex [Au(tmdt)2] (tmdt2− = bis(methylthio)tetrathiafulvalenedithiolate) were prepared. The as-grown films were insulating, which became semiconducting with the activation energy of 0.05 eV after electrochemical doping.
The Fabrication of CuInSe2–Polyacrylamide Nanocomposites by a Convenient Simultaneous Polymerization–Decomposition Technique
Authors: Zhou Yong , Hao Lingyun , Hu Yuan , Zhu Yurui , Chen Zuyao
Published: September 2002

Either CuInSe2 nanoparticle or CuInSe2 nanorod was in situ dispersed in polyacrylamide (PAM) matrix by a convenient simultaneous polymerization–decomposition (SPD) technique.
Micronized Gel Electrophoresis: Construction and Its Versatile Applications
Authors: Biyani Manish , Nishizawa Hiroshi , Miyatani Yoshihide , Kanaumi Eiichi , Eli Pharhad , Kinoshita Yasunori , Nishigaki Koichi
Published: September 2002

We have constructed a one-inch-sized apparatus for gel electrophoresis (µGE). This apparatus was shown to be of high performance and to have potentials to apply to versatile purposes mainly due to its speed and economy. The temperature gradient gel electrophoresis as well as the conventional gel electrophoresis of multi-wells was successfully performed with both DNAs and proteins. Secondary gel electrophoreses in the two alternative modes, band-cut and zone-cut, were shown to be operable.
Equilibrium Analysis of Acid Dissociation Reactions of Phenolphthalein by Using Mobility Change in Capillary Zone Electrophoresis
Authors: Takayanagi Toshio , Motomizu Shoji
Published: September 2002

An equilibrium analysis method by capillary zone electrophoresis was utilized for the determination of acid dissociation constants of phenolphthalein, which is unstable in an alkaline aqueous solution. Apparent electrophoretic mobility of phenolphthalein increased with increasing pH of a migrating solution. Acid dissociation constants (pKa) of phenolphthalein were determined as 8.84 and 9.40 by applying a non-linear least-squares analysis to the mobility change.
Removal of NO by Microwave Discharge with the Addition of CH4
Authors: Tang Junwang , Zhang Tao , Wang Aiqin , Ren Lili , Yang Huanghe , Ma Lei , Lin Liwu
Published: September 2002

Removal of NO by a continuous microwave discharge at atmospheric pressure with the addition of CH4 is reported. The conversion of NO to N2 is approximately 80%, and the energy efficiency is up to 0.55 g-NO/kWh. The effects of CH4 addition and three discharge modes on NO conversion and energy efficiency are investigated. The dependence of NO conversion on experimental time is also observed.
Acoustic Cavitation in Water under Rare Gas Atmosphere
Authors: Nagata Yoshio , Okuno Hiroshi , Mizukoshi Yoshiteru , Maeda Yasuaki
Published: September 2002

The results of the sonolysis of water and aqueous 2-methyl-2-propanol under a rare gas atmosphere suggest that increasing the solubility of the rare gas in water significantly enhances the rate of sonolysis but their thermal conductivity does not significantly affect the temperature of the cavitation bubbles.
Metal-Modified Diamond Electrode as an Electrochemical Detector for Glucose
Authors: Uchikado Ryuji , Rao Tata N , Tryk Donald A , Fujishima Akira
Published: September 2002

Nickel- and copper-modified diamond electrodes were fabricated in view of their application for carbohydrate detection. Both electrodes produced well-defined and reproducible voltammograms for 1 mM glucose in alkaline media. These electrodes exhibited excellent electrochemical stability with low background current for at least one week in a flow injection analysis system, indicating good adherence of the metal clusters to diamond. These results indicate the promising use of nickel- and copper-modified diamond electrodes for the detection of carbohydrates and amino acids.
Synthesis of α-Carbolines from β-(3-Indolyl) Ketone O-2,4-Dinitrophenyloximes
Authors: Ono Ayako , Narasaka Koichi
Published: September 2002

α-Carbolines are synthesized from β-(3-indolyl) ketone O-2,4-dinitrophenyloximes by the treatment with sodium hydride and sodium cyanoborohydride.
Decomposition of Polytetrafluoroethylene by Grinding with Strontium Oxide
Authors: Zhang Qiwu , Matsumoto Hiroki , Saito Fumio
Published: September 2002

Polytetrafluoroethylene (PTFE) was ground with SrO using a planetary ball mill in air. The grinding stimulates the solid reaction between PTFE and SrO at room temperature. PTFE is decomposed by the solid reaction and fluorine in PTFE is transformed into strontium fluoride. The results show that it is possible to mineralize highly stable polymer PTFE by grinding with proper additive.
A Mild and Efficient Oxidation of Alcohols with N-tert-Butylphenylsulfinimidoyl Chloride in the Coexistence of Zinc Oxide
Authors: Matsuo Jun-ichi , Kitagawa Hideo , Iida Daisuke , Mukaiyama Teruaki
Published: September 2002

Various primary and secondary alcohols bearing β-aryl, alkenyl, or alkoxy moiety were efficiently oxidized to the corresponding labile aldehydes and ketones under mild conditions with N-tert-butylphenylsulfinimidoyl chloride (1) in the coexistence of zinc oxide.
A Convenient Synthetic Route to Gold Nanoparticles Dispersed within Mesoporous Silica
Authors: Chen Wei , Cai Weiping , Zhang Zhongpin , Zhang Lide
Published: September 2002

A sonochemical procedure at room temperature for the preparation of gold (Au) nanoparticles loaded in mesoporous silica is described. It has been shown that the Au nanoparticles, with mean size of 3–4 nm in diameter and a fairly narrow size distribution, are dispersed uniformly within the pores of silica host.
Preparation and Vibrational Properties of BiI3 Nanocrystals
Authors: Wang Chunrui , Yang Qing , Tang Kaibin , Qian Yitai
Published: September 2002

Nanocrystalline BiI3 with average size of 10–20 nm is prepared by a hydrothermal method at 180–200 °C for the first time. The vibrational properties of as-prepared BiI3 were investigated by the Raman spectra at room temperature.
Electron Paramagnetic Resonance Study of Positive-Hole Pairs on Oxide Ions in Lithium Bismuthate Glass
Authors: Watanabe Tomohiro , Nanba Tokuro , Miura Yoshinari
Published: September 2002

The electron paramagnetic resonance signals attributed to the triplet state of the positive-hole pairs on oxide ions are observed in (100−x) Bi2O3·x Li2O glass (x = 25, 30, 35 mol%). So far as we know, this is the first experimental observation of the triplet oxygen hole center in oxide glasses.
Studies on the Transport of Lanthanides Ions through the Membrane of Human Erythrocyte in vitro by ICP-MS
Authors: Zheng Yu-juan , Lu Jun , Ding Lan , Chen Hang-ting , Zhao Da-qing
Published: September 2002

A method was developed for the determination of lanthanum in the cytoplasm of human erythrocytes after they were incubated in lanthanum nitrate or citrate solutions. The lanthanum concentration in the cytoplasm of incubated erythrocytes is much higher than that in normal erythrocytes. It is suggested lanthanum can transport through the membrane of erythrocyte in vitro. Solutions containing chelator are unsuitable to be washing buffer in the investigation.
Pd(en) as a Sequence-Selective Molecular Pinch for α-Helical Peptides
Authors: Hamachi Itaru , Kasagi Noriyuki , Kiyonaka Shigeki , Nagase Tsuyoshi , Mito-oka Yasuko , Shinkai Seiji
Published: September 2002

A palladium(II)(ethylenediamine) complex was found to selectively stabilize α-helix conformation of peptides having two histidine (His) residues at i and i + (3 or 4) positions, whereas the helix conformation of the other peptides having one or two His at different positions is destabilized.
Fabrication and Characterization of Gold–Platinum Black Electrode
Authors: Toyama Shigeru , Someya Masayuki , Takei Osamu , Ohtake Toshihito , Usami Ron , Horikoshi Koki , Ikariyama Yoshihito
Published: September 2002

Gold–platinum black layer was electrochemically deposited on a platinum electrode in the mixed solution of tetrachloroaurate, hexachloroplatinate, and lead acetate. The surface of the electrode after the deposition was characterized by scanning electron microscopy, X-ray microanalysis, and cyclic voltammetry. There was no evidence of the localization of gold and platinum, and the deposition ratio of gold and platinum was proportional to the concentration of tetrachloroaurate and hexachloroplatinate.
A Novel Organic Conductor with Two-Dimensional Molecular Array by the “Edge-to-Edge” Donor Interaction
Authors: Takahashi Kazuyuki , Nakayashiki Takashi , Taniguchi Masateru , Misaki Yohji , Tanaka Kazuyoshi
Published: September 2002

The title donor, where SM-PDT is 2-[4,5-bis(selenomethyl)-1,3-dithiol-2-ylidene]-5-(pyran-4-ylidene)-1,3,4,6-tetrathiapentalene, formed semiconducting 1:1 salts with various anions. The crystal structure analysis of (SM-PDT)PF6(PhCl)x has revealed that an edge-to-edge chalcogen interaction gave two-dimensional sheet-like structure.
Oxidation of Urazoles to Triazolinediones with Benzyltriphenylphosphonium Peroxymonosulfate under Solvent-Free Conditions
Authors: Hajipour Abdol Reza , Mallakpour Shadpour E , Adibi Hadi
Published: September 2002

Benzyltriphenylphosphonium peroxymonosulfate (PhCH2Ph3PHSO5) in the presence of AlCl3 was used as an effective oxidizing reagent for the oxidation of urazoles to their corresponding triazolinediones in high yields under solvent-free conditions.
Geminal Bond Participation in the Sigmatropic [1,5]-Hydrogen Shifts: Relative Reactivities of Z- and E-1-Substituted 1,3-Pentadienes
Authors: Ikeda Hirotaka , Ushioda Nobuo , Inagaki Satoshi
Published: September 2002

The analysis of the bond interactions at the transition states of the sigmatropic [1,5]-hydrogen shift of 1,3-pentadiene showed the significant participation of the σ bonds geminal to the reacting centers. The electron-donating σ bonds at the Z-positions in the 1-substituted 1,3-pentadienes were predicted to enhance the reactivities rather than those at the E-positions. The predictions of the relative reactivities of the Z- and E-isomers were confirmed by the calculated activation energies by the density functional theory calculations.
Syntheses and Crystal Structures of Novel Di- and Trinuclear Rhodium Complexes Bridged by Pyrazine
Authors: Yu Xiao-Yan , Maekawa Masahiko , Kondo Mitsuru , Kitagawa Susumu , Jin Guo-Xin
Published: September 2002

Novel di- and trinuclear Rh complexes, [Rh2(PPh3)4(H)4(Me2CO)2(µ-pyz)](ClO4)2·EtOH and [Rh3(PPh3)6(µ-pyz)3](ClO4)3·EtOH were selectively isolated from the reaction of [Rh(PPh3)2(H)2(Me2CO)(EtOH)]ClO4 with pyrazine (pyz) in Me2CO and THF, respectively. Their structures were crystallographically characterized.
A Stepwise Growth of Polyoxovanadate by Reductive Coupling Reaction with Organometallic Palladium Complex: Formation of [{(η3-C4H7)Pd}2V4O12]2−, [V10O26]4− and [V15O36(Cl)]4−
Authors: Hayashi Yoshihito , Miyakoshi Noboru , Shinguchi Takayuki , Uehara Akira
Published: September 2002

The three step synthesis of pentadecavanadate, (n-Bu4N)4[V15O36(Cl)] has been achieved by a stepwise growth process. The reaction of (n-Bu4N)VO3 with [(η3-C4H7)PdCl]2 gives a tetravanadate supported organometallic compound [{(η3-C4H7)Pd}2V4O12]2−. The thermal decomposition of [{(η3-C4H7)Pd}2V4O12]2− leads to the formation of reduced species [V10O26]4−, which is then converted into a larger cluster [V15O36(Cl)]4−.
The First Total Synthesis of a Macrocyclic Anti-protozoan, LL-Z1640-2
Authors: Tatsuta Kuniaki , Takano Satoko , Sato Toshimitsu , Nakano Satoshi
Published: September 2002

Anti-protozoan, LL-Z1640-2 has been stereoselectively synthesized from d-ribose through Sonogashira coupling, Tsuji hydrogenolysis, and Mukaiyama lactonization.
Nickel(II)-Catalyzed Dialkylation of Aromatic Aldehydes with Organozinc Reagents
Authors: Hu Yulai , Wang Jin-Xian , Li Wenbo
Published: September 2002

A novel reaction of the dialkylation of arylaldehydes is provided. The reaction of substituted aromatic aldehyde with organozinc halides in the presence of catalytic amount of Ni(acac)2 and a tertiary amine using a silylating agent to give 1-alkyl-1-arylalkanes in satisfactory yields.
Kohamaic Acids A and B, Novel Cytotoxic Sesterterpenic Acids, from the Marine Sponge Ircinia sp.
Authors: Kokubo Susumu , Yogi Kentaro , Uddin Md Jasim , Inuzuka Toshiyasu , Suenaga Kiyotake , Ueda Katsuhiro , Uemura Daisuke
Published: September 2002

Two new sesterterpenic acids, which exhibited moderate cytotoxicity, were isolated from the marine sponge Ircinia sp. Their absolute stereochemistries were determined by spectroscopic and chemical analyses. Their configurations at C15 were different from those of previously isolated sesterterpenes. This result suggests the existence of a (14Z)-geranylfarnesyl pyrophosphate, which is yet unknown in nature.
Unusual Oxidation of Oxo-peroxomolybdenum(VI) Tetramesitylporphyrin Giving Molybdenum(V) Porphyrin and Dioxygen
Authors: Fujihara Tetsuaki , Myougan Kazuhiro , Ichimura Akio , Sasaki Yoichi , Imamura Taira
Published: September 2002

The one-electron oxidation of MoVIO(tmp)(O2) gave a product with reduced metal ion, oxomolybdenum(V) tetramesitylporphyrin, by releasing O2.
Indium(III) Chloride Catalyzed Allylation of gem-Diacetates: A Facile Synthesis of Homoallyl Acetates
Authors: Yadav J S , Reddy B V Subba , Madhuri Ch , Sabitha G
Published: September 2002

Indium(III) chloride is found to catalyze efficiently the allylation of gem-diacetates with allyltrimethylsilane at room temperature to afford the corresponding homoallylic acetates in high yields with good regioselectivity.
Photoelectrochemical Cells Made from SnO2/ZnO Films Sensitized with Eosin Dyes
Authors: Kumara G R Asoka , Konno Akinori , Tennakone Kirthi
Published: September 2002

Photoelectrochemical cells have been constructed with SnO2/ZnO, SnO2, ZnO and TiO2 films sensitized with eosin Y (sodium salt and triethyl ammonium salt). SnO2/ZnO composite system gives a significantly high short-circuit photocurrent and an efficiency compared to the cells made from SnO2, ZnO or TiO2. It is suggested that the recombination is better suppressed in the composite system and a possible mechanism involved is discussed.
Room Temperature Molten Salts Based on Tetraalkylammonium Cations and Bis(trifluoromethylsulfonyl)imide
Authors: Matsumoto Hajime , Kageyama Hiroyuki , Miyazaki Yoshinori
Published: September 2002

Symmetric and aliphatic tetralkylammonium cations (QA) form room temperature molten salts (RTMS) with bis(trifluoromethylsulfonyl)imide (TFSI). Tetrapentylammonium (TPA) is the smallest cation to form RTMS with TFSI. The viscosity and the specific conductivity of TPA-TFSI at 25 °C are 430 mPa·s and 0.154 mS·cm−1, respectively. This is the first report of the preparation of RTMS based on symmetric QA.
Wavelength Dependent Regioselective E(trans)→Z(cis) Photoisomerization in Anthryldienes
Authors: Reddy M Janaki Ram , Rao G Venugopal , Bushan K Mani , Reddy Maruthi Janaki Ram , Gopal V Raj , Rao V Jayathirtha
Published: September 2002

Anthryldiene derivatives carrying electron withdrawing end group displayed wavelength dependant regio selective E(trans) → Z(cis) isomerization from the singlet excited state. Fluorescence studies indicated the highly polarized/charge-transfer nature of the singlet excited state.
New Silica-Pillared Layered Titanoniobate Supported Cu Catalysts for the Direct Decomposition of NO
Authors: Wang Xueguang , Hou Wenhua , Yan Qijie
Published: September 2002

Silica-pillared layered titanoniobate supported Cu catalysts have been prepared and showed high and relatively stable activity for the direct decomposition of NO (0.1 vol% in helium) in the space velocity range of 3000–30000 cm3 g−1 h−1.
Magnesium Bromide Diethyl Etherate Mediated Highly Diastereoselective Aldol Reaction between an Aldehyde and a Silyl Enol Ether
Authors: Fujisawa Hidehiko , Sasaki Yasuhiro , Mukaiyama Teruaki
Published: September 2002

High yield and excellent diastereoselectivity in the formation of methyl (2R, 3R, 5R, 6S)-2,6-dibenzyloxy-7-(t-butyldimethylsiloxy)-3-hydroxy-5-(4-methoxybenzyloxy)-4,4-dimethylheptanoate 3 and methyl (2R, 3R, 4S)-2,4-dibenzyloxy-3-hydroxypentanoate 7 are achieved by aldol reaction between (Z)-2-benzyloxy-1-methoxy-1-(trimethylsiloxy)ethene 1 and chiral alkoxy aldehydes using three equivalents of MgBr2·Oet2. The following mechanism of the above aldol reaction proposes that MgBr2·Oet2 activated both chiral alkoxy aldehydes and silyl enolate, that is, magnesiumu enolate, formed by transmetalation from silyl enolate and MgBr2·Oet2, reacted with MgBr2·Oet2-chelated alkoxy aldehydes via the six-membered cyclic transition state.
A New Ring-Forming Methodology for the Synthesis of Conformationally Constrained Bioactive Molecules
Authors: Papahatjis Demetris P , Nikas Spyros , Tsotinis Andrew , Vlachou Margarita , Makriyannis Alexandros
Published: September 2002

A new, general, one pot method for introducing carbocyclic rings alpha to a nitrile moiety is described. Treatment of readily available arylacetonitriles with potassium bis(trimethylsilyl)amide and subsequent alkylation with α, ω-dibromo or dichloroalkanes in tetrahydrofuran under anhydrous conditions at 0 °C produces cycloalkyl adducts in good yields and short reaction times.
V-MCM-41 for Selective Oxidation of Propane to Propene and Acrolein
Authors: Zhang Qinghong , Wang Ye , Ohishi Yoshihiko , Shishido Tetsuya , Takehira Katsuomi
Published: September 2002

The V-MCM-41 with lower V content catalyzes the oxidation of propane to acrolein with a yield of 3.3% and selectivity of 20%, while that with higher V content mainly produces propene.
Pu Sorption to Activated Conglomerate Anaerobic Bacteria
Authors: Sasaki Takayuki , Kudo Akira
Published: September 2002

The sorption of Pu to the anaerobic bacteria activated under specific conditions of temperature, pH and depleted nutrients after long dormant period was investigated. After 4 h at neutral pH, the distribution coefficient (Kd) between bacteria and aqueous phase at 308 and 278 K had around 103 to 104. After over 5 days, however, the Kd at only 308 K had increased to over 105. Sterilized (dead) and dormant anaerobic bacteria adsorbed Pu to the same extent.
Temperature Dependence of the Anomalous Conformational Behavior of a Short-Chain Poly(oxyethylene) in Water Studied by Raman Spectroscopy
Authors: Wahab Shaheda A , Matsuura Hiroatsu
Published: September 2002

The Raman spectra of aqueous solutions of CH3(OCH2CH2)3OCH3 were measured for mole fractions 0.002–0.06 at five temperatures between 5 and 45 °C. The population of the gauche conformation around the C–C bond shows its maximum at about 0.01 mole fraction. The appearance of the maximum is less prominent at higher temperatures. The observed conformational behavior is consistent with the results of molecular dynamics simulations.
The First Three-Leg Ladder Coordination Polymer: [Zn3(Oac)4(4,4′-bpy)3{N(CN)2}2]
Authors: Sun Bai-Wang , Gao Song , Wang Zhe-Ming
Published: September 2002

The coordination polymer [Zn3(Oac)4(4,4′-bpy)3{N(CN)2}2] is prepared and characterized by X-ray diffraction studies, which shows a unique three-leg molecular ladder structure.
Cooperation of the Ce(IV)/EDTA Complex and Oligoamine for Prompt Scission of DNA
Authors: Sumaoka Jun , Igawa Tomoyuki , Yagi Tatsunori , Komiyama Makoto
Published: September 2002

DNA hydrolysis by the Ce(IV)/EDTA complex is enormously accelerated by the cooperation with selected oligoamines. The reaction in the presence of ethylenediamine (100 mmol dm−3) is 50 times as fast as that in its absence.
Low-Temperature Poling of Dye-Doped Polymers for Nonlinear Optical Devices
Authors: Matsushima Ryoka , Tanaka Nobuki , Sugihara Okihiro , Okamoto Naomichi
Published: September 2002

By repeating the corona poling process for several times, dye-doped polymer films were efficiently poled at temperatures significantly lower than Tg. High second-order NLO efficiency (e.g., d33 around 100 pm/V) was obtained with a guest dye, 2-(p-diethylaminocinnamilidene)-indan-1, 3-dione.
Polynuclear Aromatic Thiophenes in the Murchison Carbonaceous Chondrite
Authors: Shimoyama Akira , Katsumata Hideyuki
Published: September 2002

The Murchison carbonaceous chondrite was analyzed for polynuclear aromatic thiophenes in organic solvent extract. Benzothiophene, dibenzothiophene and their methyl derivatives, and benzonaphtothiophenes were detected in concentration at levels of ten and hundred-pmol g−1. The abundance pattern of these thiophenes in the chondrite was markedly different from those in the two kinds of terrestrial sediments, indicating abiotic origin of these thiophenes.
Microscopic Fluorescence Measurement of Fast Interfacial Complexation by Two-Phase Sheath Flow Method
Authors: Tokimoto Takahira , Tsukahara Satoshi , Watarai Hitoshi
Published: September 2002

To measure fast reaction processes of the ms order at the interfacial region in the solvent extraction system, we invented a new method using a micrometer-sized two-phase sheath flow system and a laser-induced fluorometry. The reaction between Zn2+ with 5-octyloxymethyl-8-quinolinol (Hocqn) in the 1-butanol/water system was examined. The fluorescence intensity of Zn2+-ocqn complex, which increased along the inner organic phase flow, gave the complexation rate of Zn2+ with Hocqn.
GdBO3:Eu Phosphor Particles with Uniform Size, Plate Morphology, and Non-Aggregation
Authors: Wang Yuhua , Uheda Kyota , Takizawa Hirotsugu , Endo Tadashi
Published: September 2002

GdBO3:Eu vaterite type particles with fine size, plate morphology, and non-aggregation were first prepared by the mild hydrothermal method. Their characteristics were investigated and compared with those of particles prepared by solid state reactions. The result showed that the hydrothermal method appears to be applicable to prepare high quality phosphors for practical uses. This conclusion was reinforced by the existence of an important improvement in the photoluminescent performances.
A New Organic Anion Consisting of the TEMPO Radical for Organic Charge-Transfer Salts: 2,2,6,6-Tetramethylpiperidinyloxy-4-sulfamate (TEMPO-NHSO3−)
Authors: Akutsu Hiroki , Yamada Jun-ichi , Nakatsuji Shin’ichi
Published: September 2002

The title organic anion was prepared as its tetraphenylphosphonium salt, (Ph4P)(TEMPO-NHSO3), which reacted with (TTF)3(BF4)2 to give (TTF)(TEMPO-NHSO3), which shows the Curie–Weiss behavior (C = 0.360 emu K mol−1 and θ = −0.52 K) with weak antiferromagnetic interaction. This magnetic behavior is found to be attributed to the TEMPO radical.
The First Total Synthesis of Grandinal, a New Phloroglucinol Derivative Isolated from Eucalyptus grandis
Authors: Matsumoto Takuya , Singh Inder Pal , Etoh Hideo , Tanaka Hitoshi
Published: September 2002

The first total synthesis of grandinal (1) is accomplished by biomimetic cycloaddition of the jensenone derivative (2) and the o-quinone methide (3) generated by oxidation of grandinol (4).
A Selective Synthesis of Biphenyl by the Pd(Oac)2/MoO2(acac)2/O2/AcOH Catalyst System
Authors: Okamoto Makoto , Yamaji Teizo
Published: September 2002

A high selectivity of biphenyl (88%) was attained by the Pd-catalyzed dimerization of benzene in the presence of O2 and acetic acid when MoO2(acac)2 was used as a cocatalyst. Various Mo compounds gave high selectivities of biphenyl (82–87%).
The First Mixed-Valence CoIICoIII One-dimensional Chain Coordination Polymer: Synthesis and Structure of [CoII2CoIII(nta)2(azpy)4(H2O)6]·[CoIICoIII(nta)2(azpy)2(H2O)2]·4H2O (nta=Nitrilotriacetate and azpy= 4, 4′-Azobispyridine)
Authors: Li Baolong , Liu Huibiao , Xu Yan , Yin Gui , Chen Jiutong , Xu Zheng
Published: September 2002

A novel mixed-valence CoIICoIII complex [CoII2CoIII(nta)2(azpy)4(H2O)6]·[CoIICoIII(nta)2(azpy)2(H2O)2]·4H2O was synthesized and characterized. Its structure is composed of new motifs, called “the rod with open sidearms” anion and H-like trinuclear cation, which interlock each other. The stack of one-dimensional chains of [CoIICoIII(nta)2(azpy)2(H2O)2] forms two-dimensional rhombus pores through π–π stacking interaction of pyridyl rings from azpy.
CH4 Deep Oxidation on SnO2-Based Composite Oxides: Novel, Active, and Stable Catalysts
Authors: Wang Xiang , Xie You-chang
Published: September 2002

SnO2-based composite oxides containing Fe and Cr were prepared using the combination of redox reaction and co-precipitation, and studied for CH4 deep oxidation. It was found that Fe and Cr were incorporated into SnO2 (Cassiterite) to form some catalysts that are more active and far more resistant to thermal sintering than pure SnO2. Solid solution structure is possibly formed in these catalysts.
Specific Reactivity of the Carbon Filaments Formed by Decomposition of Methane over Ni/SiO2 Catalyst: Gasification with CO2
Authors: Takenaka Sakae , Otsuka Kiyoshi
Published: September 2002

Carbon filaments formed by the decomposition of methane over Ni/SiO2 catalyst are converted efficiently with conversions > 91% into CO by gasification with CO2.
Decomposition of CO2 into CO and O in a Microwave-Excited Discharge Flow of CO2/He or CO2/Ar Mixtures
Authors: Tsuji Masaharu , Tanoue Takeshi , Nakano Kousuke , Nishimura Yukio
Published: September 2002

Decomposition of CO2 in a fast electric discharge flow of CO2/He or CO2/Ar mixtures was studied by observing UV and visible emission spectra. The decomposition efficiency of CO2 in CO2/Ar mixtures was higher than that in CO2/He mixtures. More than 90% of CO2 in CO2/Ar mixtures was selectively decomposed into CO and O at a microwave power of 100-200 W, and CO2 and Ar flow rates of 25 and 1000 sccm, respectively, at a total pressure of 0.5 Torr.
Fabrication of Rutile TiO2 Foils with High Specific Surface Area via Heterogeneous Nucleation in Aqueous Solutions
Authors: Yamabi Satoshi , Imai Hiroaki
Published: September 2002

Rutile TiO2 foils with high specific surface area were fabricated through heterogeneous nucleation on substrates in acidic aqueous solutions of titanyl sulfate. Rutile crystals were directly deposited even at a near room temperature in the solutions at the conditions around the boundary between the Ti(IV) soluble species and the TiO2 crystal in the phase stability diagram of the Ti(IV)-H2O system.
Novel Fluorination Reagent: IF5 / Et3N–3HF
Authors: Yoneda Norihiko , Fukuhara Tsuyoshi
Published: September 2002

IF5 in Et3N–3HF was found to be a stable, non-hazardous, easy to handle, and inexpensive reagent that enables effective and selective fluorination of organic compounds under mild conditions.
Catalytic and Stereoselective Glycosylation with Glycosyl Fluoride Using Active Carbocationic Species Paired with Tetrakis(pentafluorophenyl)borate or Trifluoromethanesulfonate
Authors: Yanagisawa Manabu , Mukaiyama Teruaki
Published: September 2002

Catalytic and stereoselective glycosylation with glycosyl fluoride using carbocationic species paired with tetrakis(pentafluorophenyl)borate [B(C6F5)4−] or trifluoromethanesulfonate (TfO−) is investigated. When the glycosylation is carried out using the former catalyst in dichloromethane containing tBuCN, the major product is β-glycoside while α-selectivity is observed when the latter catalyst in dichloromethane containing Et2O is used. In addition to the characteristic properties of the solvent, the nature of the counter anion such as B(C6F5)4− or TfO− plays important roles in controlling the selectivity. Thus, an appropriate combination of catalyst and solvent leads to the formation of disaccharides.
Asymmetric Oxidation of Sulfide to Sulfoxides on Ti-Containing Mesoporous Silica Catalysts with Hydrogen Peroxide in the Presence of Optically Active Tartaric Acid
Authors: Iwamoto Masakazu , Tanaka Yasuhiro , Hirosumi Jiro , Kita Nozomu
Published: September 2002

On Ti-containing MCM-41 prepared by a template ion- exchange method, sulfide could be asymmetrically oxidized to sulfoxides in the presence of optically active tartaric acid (54% yield and 30% ee). The oxidation was composed of the asymmetric induction to sulfoxides and the subsequent kinetic resolution of sulfoxides.
Synthesis of Tri- and Tetranuclear Metal-Sulfur Clusters by the Reaction of a Trisulfido-Bridged Diiron Complex with W(CO)5THF
Authors: Kuge Katsuaki , Tobita Hiromi , Ogino Hiroshi
Published: September 2002

Reaction of trisulfido-bridged diiron complex [CpFe(CO)2]2(µ-S3) with 0.8 equiv of W(CO)5THF produced a trinuclear cluster [CpFe(CO)2]2(µ3-S3)W(CO)5 in which the W(CO)5 moiety was selectively coordinated to one of the α-sulfur atoms of the trisulfido ligand. The reaction with an excess of W(CO)5THF afforded a tetranuclear cluster [CpFe(CO)2]2(µ4-S3)[W(CO)5]2 as a major product in which the W(CO)5 moieties were coordinated to both of the α-sulfur atoms of the trisulfido ligand.
Acceleration of Tributyltin Hydride Reduction of Phenethyl Iodide and m-Methoxybenzyl Bromide by a Strong Magnetic Field
Authors: Fukuyoshi Shu-ichi , Kusumi Takenori
Published: September 2002

Reduction reactions of phenethyl iodide and m-methoxybenzyl bromide with tributyltin hydride are accelerated by a strong (9.4 T) magnetic field.
Theoretical and Experimental Studies of Chiral Recognition in Charged Pirkle Phases
Authors: Lee One-Sun , Jang Yun Hee , Cho Young Gi , Hyun Myung Ho , Kim Hie-Joon , Chung Doo Soo
Published: September 2002

The role of electrostatic interactions in enantioselective separation was demonstrated. Enantioselective separation of N-(3,5-dinitrobenzoyl)leucine and its esterified analogue was investigated by (S)-phenylglycine-based HPLC under an intermediate pH, and examined with a relaxed scan calculation combined with a Monte Carlo conformation search.
Synthesis and Properties of Diazacrown Ethers Carrying Two Tropone Chromophores
Authors: Yamamoto Emi , Kubo Kanji , Mori Akira
Published: September 2002

N, N′-Bis(tropon-2-yl)diazacrown ethers (2) were found to display unique absorption spectral changes in the presence of guest cations. X-ray crystallographic analysis indicated that 2a·zinc and 2c·calcium thiocyanate complexes consist of an ion pair with zinc tetrathiocyanate anion and 2a·zinc cation, and with calcium hexathiocyanate anion and 2c·H2O·calcium cation, respectively. Complexation gave rise to deconjugation between the tropone ring and the lone pair electrons of the nitrogen atom to cause spectral changes.
A Simple Route to Synthesize MInS2 (M = Cu, Ag) Nanorods from Single-Molecule Precursors
Authors: Cui Yong , Ren Jin , Chen Gang , Qian Yitai , Xie Yi
Published: September 2002

CuInS2 and AgInS2 semiconductor nanorods are prepared readily from a stoichiometric mixture of In(S2CNEt2)3 and Cu(S2CNEt2)2 or Ag(S2CNEt2), by remove of the thione groups with ethylenediamine at 195 °C in a solvothermal process.
The Air Luminescence Count for the Rapid Determination of 222Rn in a Liquid Scintillation Spectrometer
Authors: Morita-Murase Yuko , Murakami Isao , Homma Yoshio
Published: September 2002

A liquid scintillation spectrometer has been applied to the determination of the counting efficiency for the air luminescence produced by standardized 222Rn and its daughters. Based on the counting efficiency, known amounts of 222Rn can be prepared in 3.5 h. Moreover, the 226Ra source from which 222Rn is collected does not necessary have to be a standard one. In contrast, the conventional method for preparing known amounts of 222Rn usually requires a long waiting period (ca. 15–30 days).
Alternative Approach to Incorporation of Nickel into Layered Structure of Mg–Al Double Hydroxides: Intercalation with [Ni(edta)]2− Species
Authors: Tsyganok Andrey I , Suzuki Kunio , Hamakawa Satoshi , Takehira Katsuomi , Hayakawa Takashi
Published: September 2002

Coprecipitation reaction of Mg2+ and Al3+ with pre-formed [Ni(edta)]2− complex (H4edta = ethylenediaminetetraacetic acid) gives rise to a new layered double hydroxide phase.
Evidence for Ionic Interaction between Cationic Surfactant and Anionic Intermediate Generated in Cathodic Reduction of Acetophenone
Authors: Kodama Yorimitsu , Fujiwara Akihito , Kawamoto Hideki , Ohta Nobuaki , Kitani Akira , Ito Sotaro
Published: September 2002

The cathodic reduction of acetophenone in the presence of a chiral cationic surfactant in aqueous media gave S- or R-1-phenylethanol with 8–12 % ee. The observed enantioselectivity clearly suggests the interaction between the cationic surfactants and the anionic intermediate generated from the one-electron reduction of acetophenone.
New Cuprous Iodide Coordination Compounds with Four Nitronyl Nitroxides as Paramagnetic Ligands
Authors: Zhang Deqing , Ding Liang , Xu Wei , Jin Xiangling , Zhu Daoben
Published: September 2002

Two new cuprous iodide coordination compounds [Cu2I2(p-PYNN)4] (1) and [Cu4I4(m-PYNN)4] (2) containing four nitronyl nitroxides were synthesized, and their crystal structures as well as magnetic properties were investigated.
Fabrication of Polysilane–Silica Hybrid Thin Films with Controlled Refractive Index
Authors: Matsuura Yukihito , Matsukawa Kimihiro , Inoue Hiroshi
Published: September 2002

Polysilane–silica hybrid thin films, in which the polysilane segment is encapsulated within the silica matrix, were prepared by a sol–gel method using copolymers, poly[methylphenylsilane-co-(methacryloxypropyltrimethoxysilane)]. The hybrid thin films were composed of a wide range of polysilane and silica ratios without phase separation. The observed refractive index of the hybrid thin film was changed from 1.61 to 1.49 with a different composition ratio. Their refractive indexes were decreased with degradation of polysilane segments on UV irradiation.
An Efficient Biomimetic Cleavage of Aziridines with Nucleophiles Catalyzed by β-Cyclodextrin in Water
Authors: Reddy M Arjun , Reddy L Rajender , Bhanumathi N , Rao K Rama
Published: September 2002

β-Cyclodextrin catalyzed for the first time a facile ring opening of aziridines with nucleophiles such as aromatic amines and azides in water at room temperature to afford diamines and azidoamines respectively in good yields.
Preparation of Sterically Protected 3,4-Bis[(2,4,6-tri-t-butylphenyl)phosphinidene]-1,2-bis[4-(4-vinylphenyl)butyl]cyclobutene and Its Polymers
Authors: Yamada Naoki , Toyota Kozo , Yoshifuji Masaaki
Published: September 2002

Two new sterically protected 3,4-diphosphinidenecyclobutenes, i.e., 1,2-bis[4-(4-methylphenyl)butyl]-3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]cyclobutene, and 3,4-bis[(2,4,6-tri-t-butylphenyl)phosphinidene]-1,2-bis[4-(4-vinylphenyl)butyl]cyclobutene, were prepared. Copolymerization of the latter with styrene was studied. Treatment of [6-(4-vinylphenyl)hex-1-ynyl](2,4,6-tri-t-butylphenyl)phosphine with butyllithium and 1,2-dibromoethane afforded a polymer of the latter cyclobutene.
Dielectrophoretic Behavior of Single DNA in Planar and Capillary Quadrupole Microelectrodes
Authors: Tsukahara Satoshi , Yamanaka Katsuyuki , Watarai Hitoshi
Published: September 2002

Dielectrophoresis (DEP) of single DNA (about 40 kbp) labeled with a fluorophore was successfully observed in a planar quadrupole electrode cell whose working area was 65 µm in radius. The DEP behavior depended on frequency (f) of alternating current; positive DEP at lower f and negative DEP at higher f. The combination of the DEP force and a laminar flow in a capillary (82.5 µm in inner radius) with a quadrupole electrode controlled the elution of DNA from the capillary as a function of f.
Direct Observation of 2-(1-Methoxycarbonylnaphthyl)methyl Radical via Photo-Claisen Type Rearrangement
Authors: Yoshimi Yasuharu , Mizuno Kazuhiko , Maeda Hajime , Ichinose Nobuyuki , Tanaka Tomoko , Kawanishi Shun-ichi
Published: September 2002

The photo-Claisen type rearrangement of 2-(1-methoxycarbonylnaphthyl)methyl phenyl ether derivatives 1a–f was investigated. The 2-(1-methoxycarbonylnaphthyl)methyl radical and its fluorescence by use of two colored laser flash photolysis (LFP) technique were directly observed as a reactive intermediate. The reactivity of the photorearrangement depended on the p-substituents on the phenoxy group.
Asymmetric Addition of Reformatsky-Type Reagent to Imines Utilizing Diisopropyl Tartrate as a Chiral Auxiliary
Authors: Ukaji Yutaka , Takenaka Shoichi , Horita Yoshie , Inomata Katsuhiko
Published: September 2002

The asymmetric nucleophilic addition of Reformatsky-type reagent to imines, which were prepared from aldehydes and 2-aminophenols, was achieved by the use of diisopropyl (R, R)-tartrate as a chiral auxiliary to afford the corresponding β-amino acid ester derivatives with excellent enantioselectivities. In order to realize reproducible higher stereoselection, the addition of a small amount of water was crucial.
Conformational Transformation of Nonionic Surfactants α-Decyl-ω-hydroxyoligo(oxyethylene)s (C10Em) in the Solid State with Addition of Water
Authors: Fukuhara Koichi , Todo Satoshi , Matsuzaki Kiyoka , Maruta Minoru , Mizawa Takahiro , Matsuura Hiroatsu
Published: September 2002

Conformational transformation of nonionic surfactants H(CH2)10(OCH2CH2)mOH (C10Em) (m = 6 and 7) in the solid state with addition of water was studied at −20 °C by IR spectroscopy. For C10E7, the conformation of the alkyl part adjacent to the oxyethylene chain transforms from trans to gauche with addition of water at about 90 wt% of surfactant. No conformational transformation was observed for C10E6 with addition of water.
A Stable DNA Tetraloop and Its Structural Tolerance for Modification
Authors: Kawakami Junji , Yoneyama Mari , Miyoshi Daisuke , Sugimoto Naoki
Published: September 2002

Structural features of a stable hairpin DNA with a tetraloop, dAGGC(TTCG)GCCT (CORE), and its six abasic mutants were investigated by the melting behavior of the UV absorption and circular dichroism spectra. The CORE and an abasic mutant at the second position of the loop exhibit considerable thermodynamic stability and have similar structural features suggesting the same folding with an identical base orientation of the two hairpin DNAs except for the second base in the loop.
The Application of Room Temperature Molten Salt with Low Viscosity to the Electrolyte for Dye-Sensitized Solar Cell
Authors: Matsumoto Hajime , Matsuda Toshihiko , Tsuda Tetsuya , Hagiwara Rika , Ito Yasuhiko , Miyazaki Yoshinori
Published: September 2002

The effect of the viscosity of room temperature molten salt (RTMS) electrolyte has been investigated on the performance of dye-sensitized solar cell (DSSC). Both the short circuit photocurrent and conversion efficiency are increased with decreasing the viscosity of RTMS as in the case of conventional electrolytes. The conversion efficiency of 2.1% observed for the cell of EMIm-F·2.3HF is the highest value reported for all the DSSC consisted of RTMS.
Isolation and Structural and Optical Characterization of the C2v 1,2-Naphthalocyanine Isomer
Authors: Gacho Eduardo H , Naito Toshio , Inabe Tamotsu , Fukuda Takamitsu , Kobayashi Nagao
Published: September 2002

The C2v isomer of Co(1,2-Nc-C2v) (1,2-Nc = 1,2-naphthalocyaninato) has been isolated by fractional crystallization of the crude mixture of four isomers (C4h, Cs, C2v, D2h), and its crystal structure, electronic absorption, and magnetic circular dichromism have been discussed.