bluuebunny/crossref_metadata_2025 huggingface dataset:
Selective Catalytic Reduction of NO over PtMo Catalysts with Alkaline or Alkaline Earth Metal under Lean Static Conditions
Authors: Tanaka Toshiyuki , Yokota Koji , Doi Haruo , Sugiura Masahiro
Published: June 2004

The selective reduction of NO on various PtMoX-catalysts (X: Li, Na, K, Mg and Ca) loaded on metal oxides such as SiO2, Al2O3, TiO2, ZSM-5 and silicallite was studied in an oxygen-rich synthetic mixture simulated exhaust from an automotive lean-burn engine, and compared with that on PtMo/SiO2, PtNa/ SiO2, and Pt/SiO2 catalysts. The temperature window for the selective reduction of NOx on the PtMoLi-, PtMoNa- and PtMoK-catalysts was found to be remarkably wider and to shift to a higher temperature than that on the other catalysts under lean static conditions.
Large Third-Order Nonlinear Optical Susceptibilities of Multiply-Bonded M2(pyphos)4 and M2Pd2Cl2(pyphos)4 (M = Cr, Mo; Pyphos = 6-Diphenylphosphino-2-pyridonate) by Picosecond Degenerate Four-Wave Mixing Method
Authors: Mashima Kazushi , Tanaka Mitsuhiro , Kaneda Yutaka , Fukumoto Atsushi , Mizomoto Hitoshi , Tani Kazuhide , Nakano Hiroshi , Nakamura Akira , Sakaguchi Toru , Kamada Kenji , Ohta Koji
Published: June 2004

Multiply-bonded tetranuclear complexes M2Pd2Cl2(pyphos)4  (1) and dinuclear complexes M2(pyphos)4  (2)(a, M = Mo; b, M = Cr; pyphos = 6-diphenylphosphino-2-pyridonate) are found to exhibit large hyperpolarizability γ of nonlinear optical property by using the picosecond degenerate four-wave mixing (DFWM) method; the γ values of 1a (1.5 × 10−30 esu), 1b (5.2 × 10−31 esu), and 2a (6.9 × 10−31 esu) are greater than those (ca. 10−35—10−33 esu) of transition metal poly(yne) polymers.
Evaluation of Transannular Interaction in [2.3]Metacyclophanes
Authors: Tsuge Akihiko , Yasutake Mikio , Moriguchi Tetsuji , Sakata Kazunori , Yamato Takehiko , Mataka Shuntaro , Tashiro Masashi
Published: June 2004

[2.3]Metacyclophanes(=MCPs) which carry various functional groups at their outer aromatic position have been synthesized. The transannular interaction between two aromatic rings of [2.3]MCPs estimated by their NMR and UV spectra has been proved to decrease in comparison with that of the [2.2]MCP system.
In Situ Raman Spectroscopic Investigation of Surface Redox Mechanism of Vanadyl Pyrophosphate
Authors: Koyano Gaku , Saito Takaya , Misono Makoto
Published: June 2004

The reversible oxidation and reduction of vanadyl pyrophosphate ((VO)2P2O7) to and from X1 phase of VOPO4 on the surface was demonstrated under the reaction conditions of n-butane oxidation by means of in situ Raman spectroscopy. This result combined with the previous ex situ studies1 indicates that this redox cycle is responsible for the catalytic oxidation to maleic anhydride.
Construction of Two-dimensional Single Crystal of Fatty Acid by Two-step Cooling Crystallization Method
Authors: Kuri Taishi , Muto Kiyoshi , Oishi Yushi , Suehiro Kazuaki , Kajiyama Tisato
Published: June 2004

A two-step cooling crystallization method for constructing two-dimensional single crystal of stearic acid was proposed on the basis of thermal characteristics of the monolayer on the water surface. The amorphous monolayer was cooled down to a higher crystallization temperature to form a small number of crystalline nuclei at the first step, and then, the monolayer was further cooled down to a lower crystallization temperature to form large crystallites at the second step. The crystallite size and the crystallographical regularity of the monolayer were remarkably progressed by the two-step cooling crystallization method.
An Asymmetric Synthesis of the ABC Ring System of 8-Demethyltaxoids from Optically Active 8-Membered Ring Compound via Intramolecular Aldol and Pinacol Coupling Reactions
Authors: Shiina Isamu , Nishimura Toshihiro , Ohkawa Naoto , Sakoh Hiroki , Nishimura Koji , Saitoh Katsuyuki , Mukaiyama Teruaki
Published: June 2004

Optically active novel taxoids were efficiently synthesized from 8-membered ring compound 3 by successive constructions of BC and ABC ring systems via each intramolecular aldol and intramolecular pinacol coupling reactions.
Photocatalytic Activities of Na2W4O13 with Layered Structure
Authors: Kudo Akihiko , Kato Hideki
Published: June 2004

Na2W4O13 with a layered structure possessed an energy gap between those of bulky WO3 and polyacid [Si(W3O10)4]4− photocatalysts and was active for photocatalytic hydrogen and oxygen evolution reactions in the presence of sacrificial reagents.
Reduction of Vanadium(IV) to Vanadium(III) by Cysteine Methyl Ester in Water in the Presence of Amino Polycarboxylates
Authors: Kanamori Kan , Kinebuchi Yoshiko , Michibata Hitoshi
Published: June 2004

The reduction behavior of vanadium(IV) by several thiolate compounds in water was investigated in the presence of amino polycarboxylates. Vanadium(IV) can be reduced by cysteine methyl ester in the presence of edta or cydta to yield [VIII(edta or cydta)(H2O)]−, respectively.
Asymmetric Intramolecular C-H/Olefin Coupling: Asymmetric Cyclization Reactions of 1,5-Dienes Catalyzed by Rhodium Complexes
Authors: Fujii Naoaki , Kakiuchi Fumitoshi , Yamada Airi , Chatani Naoto , Murai Shinji
Published: June 2004

Asymmetric intramolecular C-H/olefin coupling reactions of 1-(2-pyridyl)- or 1-(1- methyl-2-imidazolyl)-1,5-dienes are catalyzed by a rhodium complex having a homochiral monodentate phosphine ligand.
One-dimensional Chain and Discrete Trinuclear Compounds Derived from Assembly Reaction of [Mn(saltmen)(H2O)]ClO4 and K2[Hg(CN)4] {saltmen2− = N,N′-(1,1,2,2-tetramethylethylene)bis(salicylideneiminato) dianion}
Authors: Miyasaka Hitoshi , Matsumoto Naohide
Published: June 2004

The reaction of Mn(III) Schiff base complex [Mn(saltmen)(H2O)]ClO4 and [Hg(CN)4]2− gave two distinct compounds with respect to the formula ratio of Mn/Hg and structures, one is a 1-D polymeric compound [{Mn(saltmen)(H2O)}{Hg(CN)3}]n and the other is a discrete trinuclear compound [{Mn(saltmen)(H2O)}2{Hg(CN)4}]. These compounds were synthesized by making vary the ratio of mixing two building blocks.
Remarkable Viscoelasticity of Organic Solvents Containing Trialkyl-1,3,5-benzenetricarboxamides and Their Intermolecular Hydrogen Bonding
Authors: Hanabusa Kenji , Koto Chiemi , Kimura Mutsumi , Shirai Hirofusa , Kakehi Akikazu
Published: June 2004

Remarkable rise of viscosity was observed by adding trialkyl-1,3,5-benzenetricarboxamide into organic solvents; the formation of highly viscoelastic solution was discussed by viscosity measurement, FTIR spectroscopy, and X-ray molecular structure in the crystal.
Quantitative Analyses of Cieplak vs. Felkin-Anh Effects in Hydride Reduction of Cyclohexanone
Authors: Senju Takatoshi , Tomoda Shuji
Published: June 2004

Transition structures of LiH addition to cyclohexanone have been optimized at the B3LYP/6-31G* level. The bond lengths of the incipient bond become substantially elongated compared to the previous results at the HF/3-21G level. It has been revealed that both torsional effects and hyperconjugative stabilization are of less importance for the π-facial diastereoselectivity.
High Surface Area Smectite Supported Cobalt Oxides as Active Catalysts for Thiophene Hydrodesulfurization
Authors: Hayashi Eiji , Iwamatsu Eiji , Biswas Mohammad Elias , Ali Syed Ahmed , Yamamoto Yosuke , Sanada Yuzo , Lee Augustin K K , Hamid Halim , Yoneda Toshikazu
Published: June 2004

Cobalt oxide loaded on high surface area smectites are prepared and tested in a pulse flow reactor for thiophene hydrodesulfurization (HDS). Smectites used were montmorillonite, saponite, porous saponite, hectorite and stevensite. Co-porous saponite showed the highest activity among Co-smectites, Co/Al2O3, and CoMo/Al2O3 so far studied. It suggests that the property of smectite has an influence on the catalyst activity.
Influence of Micelles and Magnetic Isotopes on Magnetic Field Dependence of Lifetimes of Benzophenone Ketyl-Alkyl Radical Pairs
Authors: Fujiwara Yoshihisa , Yoda Kohji , Aoki Takeshi , Tanimoto Yoshifumi
Published: June 2004

Influence of micelles and magnetic isotopes on magnetic field dependence of lifetimes of benzophenone ketyl-alkyl radical pairs in micellar solutions was studied below 14 T. The lifetimes were dependent on micelles and independent of isotopes. The lifetimes of radical pairs are controlled by the electron dipole interaction of the radical pairs in < 2 T and by the competition of anisotropic Zeeman interaction and the escape from the micelles in > 4 T.
Iridium-Catalyzed Redistribution of Hydrodisilanes via a Silyl(silylene)iridium(III) Complex: Synthesis of a Donor-Stabilized Silyl(silylene)iridium(III) Complex
Authors: Okazaki Masaaki , Tobita Hiromi , Ogino Hiroshi
Published: June 2004

Thermolysis of HMePhSiSiMe3 in the presence of a catalytic amount of Ir{η2-Me2Si(CH2)2PPh2} (PMe3)3 resulted in the redistribution of substituents to give its isomer HMe2SiSiMe2Ph. We propose the mechanism involving the 1,3-Me-shift on a silyl(silylene) complex, which was trapped as a donor-stabilized silyl(silylene)iridium(III) complex.
High Resolution Adsorbent of Liquid Chromatography for Protein Analysis: Cattle Bone-Originated Hydroxyapatites Characterized by Heating
Authors: Akazawa Toshiyuki , Kobayashi Masayoshi , Kodaira Kohei
Published: June 2004

The functional spherical particles of cattle-bone originated hydroxyapatite (HAp) were prepared by a spray-drying method and they exhibited considerably higher resolutions and theoretical plate numbers for chromatographic separation of albumin and lysozyme than HAp synthesized from reagents. The chromatographic functions of particles were easily regulated by changing the heat-treatment temperature of HAp, resulting from the shift of the adsorption heat for the two proteins.
Cocrystals of Melamine and Succinimide: Supramolecular Lattice Structure Constructed with Both Self and Not-self Intermolecular Hydrogen Bonds
Authors: Tukada Hideyuki , Mazaki Yasuhiro
Published: June 2004

Melamine (M) and succinimide (S) give cocrystals in a 1:1 ratio, in which a supramolecular network is formed by multiple hydrogen bonds. The network in composed of two kinds of infinite links based on four molecular units, S-M-M-S; hydrogen bonds between the units to the a direction, and the π–π stacks in the c direction.
Controllable Orientation of the Peptide-Based Surfactant at Air-Water Interface
Authors: Toyotama Akiko , Kugimiya Shin-ichi , Yonese Masakatsu , Kinoshita Takatoshi , Tsujita Yoshiharu
Published: June 2004

A polypeptide-based amphiphile, poly(γ-methyl l-glutamate)-polyethyleneglycol block copolymer (PMG-PEG), formed a stable monolayer membrane at the air-water interface. The orientation of the α-helical amphiphile in the membrane was shown to be strongly dependent on the surface pressure.
Photochromism of Dinuclear Molybdenum Complexes with Disulfur and Ethylene-1,2-dithiolate Ligands
Authors: Shibahara Takashi , Iwai Nobuaki , Sasaki Mari , Sakane Genta
Published: June 2004

Photochromism was found out for a dinuclear molybdenum complex [Mo2(μ-S2)(μ-S2C2Ph2)2(S2C2Ph2)2] (1), and a similar complex [Mo2(μ-S2)2(μ-S4)(S2C2Ph2)2] (6) was found to show no photochromic property. On exposure to sunlight and halogen-lamp light, the color of solution of 1 changes from red-purple to gray. In the dark the color returns to red-purple.
A Novel Dinuclear Ru(II) Complex Having a Bridging Ligand of a Rigid and Extended Structure: Incorporation of an Anthraquinone Unit and Efficient Emission Quenching
Authors: Mishra Lallan , Choi Chang-Shik , Araki Koji
Published: June 2004

Dinuclear Ru(II) complex having extended conjugation within the bridging ligand was prepared by coupling of the Ru(II) polypyridyl complex having a benzoyl-substituted phenazine unit with diaminoanthraquinone in one step, in which emission from the excited Ru(II) center was efficiently quenched through the anthraquinone unit.
XPS Study of the Passive Layers Formed on Lead in Aqueous Nitrate Solutions
Authors: Uchida Miho , Okuwaki Akitsugu
Published: June 2004

The analysis of the lead surface immersed in aqueous nitrate solutions by X-ray photoelectron spectroscopy (XPS) shows the formation of passive oxide layer containing nitrogen compound. The oxide layer formed on the lead surface in aqueous ammonium nitrate solution was hydrolyzed and cracked.
Nonlinear Optical Responses of Dialkoxyazobenzene Isomers Adsorbed to Interface between Heptane and Viologen-Modified Quartz Plates
Authors: Yamada Keiji , Otsubo Hisaki , Yonemura Hiroaki , Yamada Sunao , Matsuo Taku
Published: June 2004

Surface SHG was observed, when a quartz plate with a submonolayer of viologen molecules on the surface was dipped into the heptane solution of 4,4′-dialkoxyazobenzene. Isomerization of the azobenzene moiety from the trans- to cis- form induced large increase in the SHG. The SHG was ascribed to intramolecular charge-transfer from the alkoxy- to the azo group of the non-centrosymmetrically aligned isomers on the quartz plate.
Nitration of N-Confused Porphyrin
Authors: Ishikawa Yuichi , Yoshida Ichiro , Akaiwa Kaori , Koguchi Eiji , Sasaki Takeo , Furuta Hiroyuki
Published: June 2004

The internal carbon of the inverted pyrrole in N-confused tetraphenylporphyrin 1 (5,10,15,20-tetraphenyl-2-aza-21-carbaporphyrin) was nitrated by using the following aqueous solutions at room temperature for several minutes; (1) NaNO2/HCl (yield 71%) and (2) 30 wt% nitric acid (yield 27%).
Stereoselective Luminescence Quenching in the Complex of Excited Triplet State of Δ-Tris(2,2′-bipyridine)ruthenium(II) with Optically Active Viologens in an Aqueous Solution
Authors: Tsukahara Keiichi , Kaneko Junko , Miyaji Tomoko , Hara Tomoko , Kato Masako , Kimura Masaru
Published: June 2004

Stereoselectivity was found in the intracomplex quenching process between the excited triplet state of Δ-tris(2,2′-bipyridine)ruthenium(II) and optically active viologen containing naphthyl group(s), where the bipyridine ligand interacts with the naphthyl group of viologen.
Photo-Oxidative Coupling of Methane over TiO2-based Catalysts
Authors: Okabe Kiyomi , Sayama Kazuhiro , Kusama Hitoshi , Arakawa Hironori
Published: June 2004

Oxidative coupling of methane was carried out under UV-irradiation at temperatures below 500 K. C2+ hydrocarbons were formed over TiO2 catalysts prepared from Ti(i-OPr)4 by hydrolysis. Correlation between C2+ selectivity and anatase fraction (%-anatase) of the catalysts was observed.
Selective Carbon-Bromine Bond Fission Induced by Non-Resonant Two-Photon (NRTP) Excitation of trans-4-Bromostilbene
Authors: Miyazawa Takashi , Liu Chengyou , Kira Mitsuo
Published: June 2004

Non-resonant two-photon (NRTP) excitation of a 1,4-dioxane solution of trans-4-bromostilbene induces selective homolytic carbon-bromine bond fission, in contrast to the corresponding single-photon (SP) excitation, where the cis-trans isomerization in predominant.
New Spiro Donor Molecules: Bis(tetrathiafulvalenyldithio)-methane and -germane
Authors: Ueda Kazumasa , Yamanoha Masaru , Sugimoto Toyonari , Fujita Hideo , Ugawa Akito , Yakushi Kyuya , Kano Kenji
Published: June 2004

As a new tetrathiafulvalene (TTF)-based donor molecule were synthesized spiro carbon and germanium compounds substituted with two tetrathiafulvalenyldithiolate groups. The redox processes were composed of two pairs of broad and reversible waves, each of which involves two electron transfer. The radical cations or bis(radical cation)’s generated by one- or two-electron oxidation were characterized by ESR.
The First Example of μ-Oxo-bis(μ-carboxylato)dioxovanadium(IV,V) Complex
Authors: Fukuda Izumi , Matsushima Hideaki , Maeda Kouichi , Koikawa Masayuki , Tokii Tadashi
Published: June 2004

A novel dinuclear oxovanadium(IV,V) complex, [(VO)2(O)(Ph2CHCOO)2(bpy)2]NO3·CH3OH (1), has been prepared. X-Ray structural analysis has revealed that 1 has a μ-oxo-bis(μ-carboxylato)-bridged structure. Magnetic susceptibility data for 1 show the paramagnetic behavior which is attributable to the d1-d0 system.
Formation of the He2(c,d,e,f,C,D,E,F) States by Ion-Ion Neutralization Reaction of He2+ with C6F6− in the Helium Flowing Afterglow
Authors: Tsuji Masaharu , Oda Erika , Tanaka Makoto , Nakamura Masafumi , Nishimura Yukio
Published: June 2004

The ion-ion neutralization reaction of He2+ with C6F6− has been spectroscopically studied in a He flowing afterglow. The He2(C,D,E,F,c,d,e,f) states in the energy range of 19.22-20.62 eV were produced. There was a great similarity in the product electronic state distribution between the He2+/C6F6− and He+/C6F6− reactions leading to He2* and He*, respectively.
The Role of Thermal Initiation in Nitroxide Mediated Living Free Radical Polymerizations
Authors: Veregin R P N , Kazmaier P M , Odell P G , Georges M K
Published: June 2004

The BPO initiated “living” polymerization of styrene in the presence of nitroxide is not consistent with the recently proposed steady-state mechanism, which requires constant nitroxide and polymer radical concentrations, and equal initiation and termination rates. It is shown that none of these conditions are met. The data is consistent with a polymerization rate that is dominated by nitroxide, not by the rates of thermal initiation and termination. Further, the use of agents that reduce thermal initiation shows that thermal initiation is not necessary to ensure that the polymerization proceeds, nor to ensure fast rates.
Mechanochemical Collapse of M41S Mesoporous Molecular Sieves through Hydrolysis of Siloxane Bonds
Authors: Tatsumi Takashi , Koyano Keiko A , Tanaka Yoshinori , Nakata Shinichi
Published: June 2004

The structural collapse of mesoporous molecular sieves MCM-48 and MCM-41 materials by mechanical compression was found to occur mechanochemically through the hydrolysis of Si-O-Si bonds. Their ordered structures were well retained by compressing the samples under dry N2.
Solid State Dye-Sensitized TiO2 Solar Cell with Polypyrrole as Hole Transport Layer
Authors: Murakoshi Kei , Kogure Ryuichiro , Wada Yuji , Yanagida Shozo
Published: June 2004

Solid type dye-sensitized solar cell was fabricated using photodepositing polypyrrole onto the surface of porous TiO2 electrode anchored by photosensitizing molecules of a ruthenium complex. Polypyrrole in the porous medium successfully works as hole transport layer connecting the sensitizer dye molecules to a counter electrode. Doping density of the polypyrrole conducting layer was optimized to improve the efficiency of the system.
Electrochemical Behavior of Hydrogen-Bonded Bilayers of Azobenzene Langmuir-Blodgett Film and Self-Assembled Monolayer on Gold
Authors: Zhao Chun-Xia , Zhang Jin , Liu Zhong-Fan
Published: June 2004

Langmuir-Blodgett (LB) monolayer of C8H17-C6H4-N=N-C6H4-O-(CH2)3-COOH (referred as ABD) was deposited on X-(CH2)2-SH self-assembled monolayer (SAM) modified gold electrode (X = COOH, OH), and hydrogen bond was created at the SAM-LB interface as evidenced by FTIR results. Electrochemical studies demonstrated that, different hydrogen bonding structures give different stabilities and redox behaviors.
Amberlyst A-21 an Excellent Heterogeneous Catalyst for the Conversion of Carbonyl Compounds to Oximes
Authors: Ballini Roberto , Barboni Luciano , Filippone Paolino
Published: June 2004

Oximes can be efficiently obtained at room temperature by simply dissolving the appropriate carbonyl compounds and hydroxylamine hydrochloride, in ethanol, with Amberlyst A-21 as catalyst. Good yields of oximes are obtained, in very short reaction times, even with polifunctionalized substrates.
Synthesis of Conjugated Rigid-Rod Polyarylenes with (η4-Cyclobutadiene)cobalt Moieties in the Main Chain
Authors: Rozhanskii Igor L , Tomita Ikuyoshi , Endo Takeshi
Published: June 2004

Ni(0)-promoted dehalogenation polycondensation of bifunctional (η5-cyclopentadienyl)(η4-cyclobutadiene)cobalt complexes yields rigid-rod π-conjugated polyarylenes, which exhibit the liquid-crystalline behavior both in melts and in solutions.
The Surface Capping of the CdS Nanoparticle with the Electroneutral Group of 2,2′-Bipyridine in AOT Reverse Micelle
Authors: Deng Huihua , Li Ming , Zhang Yu , Lu Zuhong , Fu Degang
Published: June 2004

The CdS nanoparticles capped with 2,2′-bipyridine (bpy) had been synthesized in AOT reverse micelle. Bpy molecules adsorb on the Cd2+-rich surface of the CdS cluster via the nitrogen σ donation, which was elucidated by the FT-Raman spectroscopy. AOT exists as an anion ion of AOTSO3− in the CdS/bpy composite.
Oxide Transfer Reaction from Carbonate to Metal-CO Complex, Affording Metal-η1-CO2 Complex and Carbon Dioxide
Authors: Nakajima Hiroshi , Tsuge Kiyoshi , Tanaka Koji
Published: June 2004

The unprecedented oxide transfer reaction from CO32− to the carbonyl complex, [Ru(bpy)2(CO)2]2+ in aprotic media is described. The oxide transfer proceeds via the 1:1 adduct formation, to afford Ru(bpy)2(CO)(η1-CO2) and CO2.
New Optically Active Diporphyrin Having a Chiral Cyclophane as a Spacer
Authors: Ema Tadashi , Misawa Shigeharu , Nemugaki Shuichi , Sakai Takashi , Utaka Masanori
Published: June 2004

Optically active dimeric porphyrin covalently linked by a chiral cyclophane was synthesized; the two porphyrin chromophores were disposed in a slipped cofacial fashion, which was found to be tunable by cooperative coordination of diamines with various chain lengths.
Umabanol, a New Tetracyclic Diterpene from a Marine Sponge
Authors: Tanaka Junichi , Nurrachmi Irvina , Higa Tatsuo
Published: June 2004

A new diterpene, umabanol, has been isolated from the sponge Epipolasis kushimotoensis and its structure determined by spectroscopic analysis. Umabanol possesses a new tetracyclic ring system related to verrucosane class diterpenes.
Catalytic Ability of Alkaline Phosphatase to Promote P-O-P Bond Hydrolyses of Inorganic Diphosphate and Triphosphate
Authors: Yoza Norimasa , Onoue Sumie , Kuwahara Yoshie
Published: June 2004

Alkaline phosphatase(EC3.1.3.1) catalyzed the hydrolyses of inorganic diphosphate(pyrophosphate) and triphosphate. The rate of P-O-P bond cleavage decreased with increasing pH at alkaline region, in contrast to the pH-dependencies of P-O-C and P-F bond cleavages. The enzyme was inactive toward cyclic triphosphate and, unlike well-known inorganic pyrophosphatase(EC3.6.1.1), was not inhibited by fluoride ion.
Enantioselective Borohydride Reduction of N-Diphenylphosphinyl Imines Using Optically Active Cobalt(II) Complex Catalysts
Authors: Sugi Kiyoaki D , Nagata Takushi , Yamada Tohru , Mukaiyama Teruaki
Published: June 2004

The enantioselective borohydride reduction using optically active cobalt(II) complex catalysts was successfully applied to various aryl N-diphenylphosphinyl imines, and the corresponding reduced products were obtained in good yields with high enantiomeric excesses (up to 99% ee). The optically active primary amines were obtained by the successive hydrolysis under mild conditions.
Dissymmetrical Photodimerization of Methyl 9-Anthroate
Authors: Noh Taehee , Lim Heejun
Published: June 2004

Irradiation of methyl 9-anthroate through a Uranium filter gave the 1,4-10′,9′ and 1,4-9′,10′ cyclodimers as well as the 9,10-10′,9′ cyclodimer; this is the first example of intermolecular photodimerization involving the 1,4,9′, and 10′ positions of meso-substituted anthracenes. These dissymmetrical cyclodimers were found to be thermally more labile than the 9,10-10′,9′ cyclodimer.
An Artificial Substrate for the Thermostable Farnesyl Diphosphate Synthase from Bacillus stearothermophilus
Authors: Nagaki Masahiko , Koyama Tanetoshi , Nishino Tokuzo , Shimizu Kanako , Maki Yuji , Ogura Kyozo
Published: June 2004

Desmethyl homologs of dimethylallyl diphosphate and of isopentenyl diphosphate were examined for the reactivity as substrates for the thermostable farnesyl diphosphate synthase of Bacillus stearothermophilus. E-But-2-enyl diphosphate was not accepted as a substrate at all, but but-3-enyl diphosphate reacted with dimethylallyl- and geranyl diphosphates to give norgeranyl- and norfarnesyl diphosphates, respectively, which lack methyl groups at the 3-positions.
Synthesis and Characterization of Thiophene 1-Oxides Kinetically Stabilized by Bulky Substituents at the 3- and 4-Positions
Authors: Nakayama Juzo , Yu Ting , Sugihara Yoshiaki , Ishii Akihiko
Published: June 2004

Oxidation of 3,4-di-t-butyl- and 3,4-di-1-adamantyl-, and 2,4-di-t-butylthiophenes with an equimolar amount of m-chloroperbenzoic acid in the presence of BF3•Et2O gave the corresponding thiophene 1-oxides in good yields, which are stable enough to be isolated in pure crystalline form. An X-ray single crystal structure analysis led to the conclusion that thiophene 1-oxides would not be aromatic.
Synthesis, Structure and Properties of [7]Heterohelicenes Possessing Phenolic Hydroxy Functions
Authors: Tanaka Kazuhiko , Kume Takuji , Takimoto Tadashi , Kitahara Yoshinori , Suzuki Hitomi , Osuga Hideji , Kawai Yasushi
Published: June 2004

Photocyclization of 2,7-bis[3-(t-butyldimethylsilyloxy)phenylvinylene]benzo[1,2-b:4,3-b′]dithiophene affords three regioisomers of the bis(silyloxy)[7]thiaheterohelicenes together with the unexpected 4-phenyl-substituted [7]thiaheterohelicene. Cleavage of the silyl ethers gave the helical quinone, which includes ethanol as guest molecules to form a 1:1 inclusion complex.
A New Synthesis of (E)-4-Alkoxy-2-formylamino-3-butenoic Acid Derivatives Utilizing 3-Alkoxy-1-isocyano-1-lithiopropenes
Authors: Kobayashi Kazuhiro , Akamatsu Hideki , Irisawa Susumu , Takahashi Masaki , Morikawa Osamu , Konishi Hisatoshi
Published: June 2004

The title amino acid derivatives have been prepared in two steps from 3-alkoxy-1-isocyanopropenes. The key step is the alkoxycarbonylation of 3-alkoxy-1-isocyano-1-lithiopropenes with alkyl chloroformates to afford the corresponding 4-alkoxy-2-isocyano-3-butenoates, which are readily converted to the title compounds by acidic hydrolysis.
Periselective [4π+2π] Cycloaddition Reactions of 3-Ethoxy Carbonyl-2H-cyclohepta[b]furan-2-one with Aralkenes
Authors: Nair Vijay , Nair Anilkumar G , Rath Nigam P , Eigendorf Guenter K
Published: June 2004

The periselective [4π+2π] cycloaddition reactions of 3-ethoxycarbonyl-2H-cyclohepta[b]furan-2-one with different aralkenes is described. The exclusive formation of [4π+2π] adducts in these reactions has been rationalised by MNDO and AM1 calculations.
Homogeneous DNA Hydrolysis by Cerium(IV)/Lanthanide(III)/Dextran Ternary Complexes
Authors: Sumaoka Jun , Kajimura Ayako , Ohno Masayuki , Komiyama Makoto
Published: June 2004

Homogeneous solutions for DNA hydrolysis are prepared from cerium(IV) ion, lanthanide(III) ion, and dextran. When [Ce(IV)] = 10, [Pr(III)] = 5, and [dextran (monomeric residue)] = 20 mmol dm−3 at pH 7.0 and 50 °C, the pseudo-first-order rate constant for the hydrolysis of thymidylyl(3′→5′)thymidine (TpT) is 0.10 h−1.
New Troponoid Liquid Crystalline Compounds, 5-Alkoxy-2-(4-alkoxybenzoylamino)tropones
Authors: Mori Akira , Hirayama Ken , Kato Nobuo , Takeshita Hitoshi , Ujiie Seiji
Published: June 2004

The X-ray crystallographic structural analysis of 5-butoxy-2-(4-methoxybenzoylamino)tropone, a liquid crystalline compound, revealed to form the head-to-tail dimer, in which a CH-π interaction between the benzoyl π-system and the β-hydrogen of the 5-butoxy group on the tropone ring of the neighboring molecule as well as intermolecular π-π stacking interactions with the two tropone systems. On the other hand, 2-(4-alkoxybenzoylamino)-5-methoxytropone lacking the β-hydrogen and the corresponding benzenoid, N-(4-alkoxyphenyl)-4-alkoxybenzamide were non-mesogenic.
Preparation of ZnO Films on Sapphire (0001) Substrates by Alternate Supply of Zinc Acetate and H2O
Authors: Kobayashi Kenkichiro , Okudaira Shinji
Published: June 2004

ZnO films have been prepared by alternate supply of zinc acetate and H2O. A rate of film growth is nearly equal to an ideal rate expected for atomic layer epitaxy when both zinc acetate and H2O are sufficiently supplied. The morphology of ZnO films is affected by amount of zinc acetate and H2O per cycles.
Formation of Cobaltadithiolene in a One-Pot Reaction among [Co(Cp)(CO)2], α,β-Unsaturated Carbonyls, and Elemental Sulfur
Authors: Sugimori Akira , Suzuki Kazutake , Nozawa Sho-hei , Soma Akira , Sugiyama Toru , Kajitani Masatsugu , Akiyama Takeo
Published: June 2004

A one-pot reaction among [(Cp)Co(CO)2], some α,β-unsaturated carbonyls, and elemental sulfur gives cobaltadithiolene complexes, [(Cp)Co(S2C2XY)]. The reaction affords a convenient synthesis of the cobaltadithiolene rings having aldehyde and ketone groups. The reaction involves the formal dehydrogenation of alkene presumably via cooperative interactions with sulfur and [(Cp)Co] species.
Studies on the Reaction Mechanism of CH4/CO2 Reforming over Co/γ-Al2O3 Catalyst
Authors: Lu Yong , Yu Changchun , Xue Jinzhen , Liu Yu , Shen Shikong
Published: June 2004

XPS/AES and pulse reaction characterizations were combined to study the reaction mechanism of CH4/CO2 reforming to syngas over Co/γ-Al2O3. Surface carbide carbons formed from CH4 dissociation were active C species for CO generation. Metallic Co species played an important role in dissociating CH4 to form carbide carbon and H2, abstracting an O atom from CO2 molecule, and transferring O atom to carbide to form CO.
Regioselective Introduction of 2-Propynyl Groups into the C-2 or C-3 Position of Furanoside Ring
Authors: Kubota Dai , Mitsunobu Oyo
Published: June 2004

The reaction of methyl 2,3-anhydro-α-d-ribofuranoside or methyl 2,3-anhydro-5,6-O-cyclohexylidene-α-d-allofuranoside with 2-propynyl metallic reagents exclusively gave the corresponding 2-C-(2-propynyl)-arabino-pentofuranosides and 2-C-(2-propynyl)-altro-hexofuranosides, respectively. In contrast, the β-anomers were selectively attacked at the position 3 to afford the corresponding 3-C-(2-propynyl)furanosides.
Organoaluminum-Promoted Rearrangement of Epoxysilanes to α-Silylaldehydes
Authors: Ooi Takashi , Kiba Toshitaka , Maruoka Keiji
Published: June 2004

Selective rearrangement of epoxysilanes to α-silylaldehydes has been achieved with high efficiency by using exceptionally bulky oxygenophilic methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR) as a stoichiometric reagent. Catalytic use of MABR led to silyl enol ethers in good yield.
Novel Formation of Nitrate and Ammonium Ions by Reaction of Inorganic Molybdenum Nitride with Hydrogen Peroxide
Authors: Mizuno Noritaka , Nakajima Hitoshi , Tanaka Hitoshi , Kudo Tetsuichi
Published: June 2004

A reaction of molybdenum nitride with hydrogen peroxide was characterized by elemental analysis, 14N NMR, IR, XPS, TOF mass, and TG/DTA spectroscopy and acid/base, ammonia, and peroxo titration with NaOH, indophenol, and KMnO4 reagents, respectively. It was found that nitrate and ammonium ions as well as peroxoisopolymolybdates were produced by the reaction.
Photoinduced Hydrogen Evolution by Using Platinum-Loaded Langmuir-Blodgett and Cast Films of Porphyrin
Authors: Hosono Hideyuki
Published: June 2004

Platinum-loaded Langmuir-Blodgett and cast films of a porphyrin are prepared, and steady photoinduced hydrogen evolution is observed using both films under steady-state irradiation.
Spectroelectrochemical Characterization of Quinohemoprotein Alcohol Dehydrogenase from Gluconobacter suboxydans
Authors: Torimura Masaki , Kano Kenji , Ikeda Tokuji , Ueda Teruhisa
Published: June 2004

Direct electron transfer of alcohol dehydrogenase (ADH) from Gluconobacter suboxydans, which contains one pyrroloquinoline quinone (PQQ) and four hemes c, are realized on a carbon-wool column electrode. Potential-dependent spectral change monitored with a photodiode array detector is well explained by a five-step Nernstian electron transfer model. The evaluated redox potentials are reasonable to explain the chemical reactivity of ADH with various redox reagents.
Syntheses and Properties of π-Conjugated Polymers Containing Chromophore. 1. Water-Soluble Small-Bandgap Polymer Backbone
Authors: Aota Hiroyuki , Reikan Takeshi , Matsumoto Akira , Kamachi Mikiharu
Published: June 2004

Water-soluble polymers were prepared from pyrrole and sodium o-benzaldehydesulfonate by addition-condensation polymerization. The bandgap of the polymer obtained was estimated to be less than 0.5 eV.
Synthesis of Silyl Enol and Silyl Dienol Ethers of 20-Oxosteroids: The Effect of β-Substituents
Authors: Moreno Maria José S M , Martins Rosa Maria L M , Melo Maria Luísa Sá e , Neves André S Campos
Published: June 2004

An efficient method to obtain regioselectively the title compounds is described. Experimental studies concerning the effect of β-substituents on the generation of β-substituted silyl enol ethers made feasible for the first time the isolation and identification of the products resulting from the unstable thermodynamic silyl enol ether.
Photoinduced Hydrogen Evolution Using Cytochrome c3 as a Mediator
Authors: Hiraishi Tomohiro , Kimura Eiichi , Kamachi Toshiaki , Okura Ichiro
Published: June 2004

Photoreduction of cytochrome c3 using proflavin was investigated and photoinduced hydrogen evolution with hydrogenase using cytochrome c3 as an electron carrier was established. The photoexcited proflavin was quenched by triethanolamine, followed by cytochrome c3 reduction, and hydrogen evolution catalyzed by hydrogenase.
Intensity Enhancement of the Infrared Transmission Spectra of p-Nitrobenzoic Acid by the Presence of the Pb Films
Authors: Yoshidome Toshifumi , Inoue Toshihito , Kamata Satsuo
Published: June 2004

Infrared transmission spectra of p-nitrobenzoic acid deposited on a Pb film evaporated on a KBr substrate were measured in the Pb film thickness region 0 to 150 nm. The enhancement of the infrared spectrum with the use of the Pb film was first observed. The dependence of the enhancement factor on the Pb film thickness was peculiar, and was discussed together with the structure of the Pb films to clarify the mechanism.
Chemistry and Antimicrobial Activities of 3,5,7,9-Decatetrayn-2-ol and Related Compounds
Authors: Yamaguchi Masahiko , Park Hyeon-Joo , Hirama Masahiro
Published: June 2004

Unstable 3,5,7,9-octatetrayn-2-ol showed potent antimicrobial activity against bacteria and fungi. Its trimethylsilyl derivative, which possessed much improved stability, showed comparable activity. It is due to desilylation under neutral aqueous conditions.
Raman Spectroscopic Study on the Two Distinct Solvated Structures of p-Nitroaniline in Acetonitrile
Authors: Mohanalingam Kathaperumal , Hamaguchi Hiro-o
Published: June 2004

Structure of the two distinct forms of p-nitroaniline (pNA) associated with solvent acetonitrile (AN) has been elucidated by a curve fitting analysis of the observed Raman spectra of pNA in AN/CCl4 mixed solvents.
Irregularity in Opsin Shifts of Hydroretinochromes
Authors: Tsujimoto Kazuo , Iida Kaoru , Sheves Mordechai , Ohashi Mamoru
Published: June 2004

Hydroretinochromes were reconstituted with aporetinochrome and hydroretinal analogues; 7,8-dihydroretinal, 5,6-dihydroretinal, dehydroretinal, and their analogues. The ‘opsin shifts’ were 2200 ± 100 cm−1 for trienals and pentaenals, whereas 1600 ± 100 cm−1 was the value for tetraenals.
A Series of Oxorhenium(V) Complexes Containing Tridentate Tris(2-pyridylmethyl)amine Bearing One Free 2-Pyridylmethyl Arm
Authors: Sugimoto Hideki , Sasaki Yoichi
Published: June 2004

Tris(2-pyridylmethyl)amine (tpa) coordinates to oxorhenium(V) with two pyridyl and one amino nitrogen atoms leaving one 2-pyridylmethyl arm uncoordinated, giving a series of complexes, [Re(O)(L)(η3-tpa)]+ (L is chelating dianion), due to strong trans influence of the oxo ligand.
Synthesis of an Optically Active α-Tetralone: A Key Intermediate to Natural Benanomicinone
Authors: Nishizuka Toshio , Hirosawa Sehei , Tsushima Masaki , Kondo Shinichi , Ikeda Daishiro
Published: June 2004

An optically active dihydroxy-α-tetralone was synthesized from methyl α-d-xylopyranoside via dimethyl (2R,3S)-dihydroxyglutarate. This α-tetralone is a key intermediate to construct the natural benanomicinone.
Two Step Conversion of Selenothioacetic Acid S-Butyl Ester to 1,3-Oxaselenolanes via Regio- and Stereoselective Ring Opening of Oxiranes
Authors: Murai Toshiaki , Fujii Makiko , Kato Shinzi
Published: June 2004

The reaction of the lithium eneselenolate generated from selenothioacetic acid S-butyl ester with oxiranes proceeded regio- and stereoselectively to give β-hydroxyethyl vinyl selenides in good yields. The acid-catalyzed cyclization of β-hydroxyethyl vinyl selenides was complete within 5 min to give 1,3-oxaselenolanes.
Enantio- and Diastereoselective Synthesis of Isoxazolidines by Asymmetric 1,3-Dipolar Cycloaddition of Nitrones
Authors: Ukaji Yutaka , Taniguchi Katsumi , Sada Kazunori , Inomata Katsuhiko
Published: June 2004

The asymmetric 1,3-dipolar cycloaddition of nitrones possessing electron withdrawing group to an achiral allyl alcohol was achieved by the use of diisopropyl (R,R)-tartrate as a chiral auxiliary to afford the corresponding isoxazolidines with high regio-, diastereo- and enantioselectivity.
The Ring-Opening Reaction of 3,3,3-Trifluoropropene Oxide with Carbanions: Reaction of α-Cyanocarbanions
Authors: Katagiri Toshimasa , Akizuki Makoto , Kuriyama Tomoyuki , Shinke Satoshi , Uneyama Kenji
Published: June 2004

Nucleophilic ring-opening reaction of 3,3,3-trifluoropropene oxide (TFPO) was studied. Reaction of TFPO with carbanions stabilized by cyano group gave γ-cyanohydrins in moderate to good yields. Meanwhile, reaction of the carbanions from malonic ester and nitromethane resulted in recovery of TFPO.
A Free Radical in Human Cerebrospinal Fluid Investigated by EPR
Authors: Nakagawa Kouichi , Tsuchihasi Nobuaki
Published: June 2004

We have detected a free radical in human cerebrospinal fluid (CSF) and have identified as ascorbyl radical using electron paramagnetic resonance (EPR). EPR spectrum of the radical in CSF was compared with one in the corresponding serum. Determination of the ascorbyl radical concentrations in CSF and serum was attempted using known concentrations of a nitroxyl radical. Moreover, an alternative method to measure the biological radical was provided.
A Novel Octanuclear Copper(I) Complex with a Compressed Square Antiprismatic Cu8 Core
Authors: Kawamoto Tatsuya , Ohkoshi Naoki , Nagasawa Isoroku , Kuma Hiro , Kushi Yoshihiko
Published: June 2004

A novel octanuclear copper(I) complex, which has a compressed square antiprismatic core of copper atoms (Cu···Cu = av. 2.651(9) Å), was prepared by the reaction of copper(II) acetate with 2-(4-methoxyphenyl)benzothiazoline.
Molecularly Imprinted Uniform-Sized Polymer-Based Stationary Phase for Naproxen
Authors: Haginaka Jun , Takehira Hisako , Hosoya Ken , Tanaka Nobuo
Published: June 2004

A molecularly imprinted uniform-sized polymer-based stationary phase for (S)-naproxen has been prepared using 4-vinylpyridine and ethylenedimethacrylate as a host functional monomer and cross-linker, respectively. The imprinted polymer material could separate naproxen enantiomers with separation factor of 1.74. Further, the materials showed high selectivity for naproxen and moderate selectivity for other 2-arylpropionic acid derivatives. On the other hand, the imprinted polymer material showed little selectivity for other acidic, basic and neutral compounds.
Gas Separation at the Solid-Solid Interface of a Piezoelectric Bimorph Using an Electric Field
Authors: Seto Takatoshi
Published: June 2004

A new system for controlling gas separation through the solid-solid interface of a piezoelectric bimorph and using an applied electric field was made. By applying vapor deposition of metal (aluminum) to a surface of the bimorph, we created a field-induced aperture at the interface of nanometer dimensions. The device provided separation of H2 and CO2 slightly higher than theoretical Knudsen values. The permeation rates were significantly affected by imposed electric fields.
The First Ligand Oxidation of Cobalt(III) Thiolato Complex by Molecular Dioxygen
Authors: Yamanari Kazuaki , Kawamoto Tatsuya , Kushi Yoshihiko , Komorita Takashi , Fuyuhiro Akira
Published: June 2004

The first ligand oxidation of Co(III)-bound thiolates by molecular dioxygen is realized in the presence of active charcoal. Three oxidation products are characterized by UV/VIS absorption and 13C NMR spectra and X-ray crystal analysis.
High Utility of Saccharomyces cerevisiae Harboring Rat Liver Cytochrome P450 1A2 cDNA in Haloethanes Dehalogenations
Authors: Yanagita Kazutaka , Sagami Ikuko , Shimizu Toru
Published: June 2004

Yeast harboring rat liver P450 1A2 efficiently degraded trichloroethylene, pentachloroethane and hexachloroethane. Since liver P450s catalyze degradation of thousands of chemicals, this method is promising for chemical-directed degradation of environmental pollutants.
Synthetic Studies toward Potent Cytotoxic Agent Amphidinolide B : Synthesis of the Entire C14-C26 Moiety of the Top Half
Authors: Chakraborty Tushar K , Thippeswamy Devasamudram , Suresh Vayalakkada R , Jayaprakash Sarva
Published: June 2004

Regioselective hydroboration of a 4-methyl-2-alkene, oxidation of the resulting mixture of isomeric alcohols, and finally diastereoselective reduction of the ketone are the key steps in the stereoselective synthesis of C19-C26 fragment of amphidinolide B which was coupled with the C14-C18 fragment leading to the first synthesis of the entire C14-C26 moiety of this important molecule.
Synthetic Studies toward Potent Cytotoxic Agent Amphidinolide B: Synthesis of the Entire Cl-C13 Moiety of the Bottom Half
Authors: Chakraborty Tushar K , Suresh Vayalakkada R
Published: June 2004

Sharpless asymmetric dihydroxylation and Nozaki-Hiyama-Kishi’s Cr(II)-mediated coupling between an α-alkoxyaldehyde and a vinyl iodide are the key steps in the stereoselective synthesis of the entire C1-C13 segment of the bottom-half of amphidinolide B.
Oxidation Mechanism of NAD Dimer Model Compounds
Authors: Patz Matthias , Kuwahara Yoshihiro , Suenobu Tomoyoshi , Fukuzumi Shunichi
Published: June 2004

The oxidation of a dimeric N-benzyldihydronicotinamide with various oxidants such as quinones, triphenyl carbenium ions and a triplet exited tris(bipyridine) ruthenium(II) complex occurs via initial outer-sphere electron transfer followed by fast C–C bond cleavage and second electron transfer. The kinetic studies allow the determination of the oxidation potential of this compound.
Combined Effect of Bulkiness and NH···S Hydrogen Bonding Controls the Formation of Terminal and Bridging Hydrazine Ruthenium(II) Complexes with Thiolate Ligands
Authors: Mashima Kazushi , Kaneyoshi Hiromu , Kaneko Sei-ichi , Tani Kazuhide , Nakamura Akira
Published: June 2004

The coordinatively unsaturated 16 electron ruthenium-thiolate complexes (η6-C6H6)Ru(S-2,6-C6H3Me2)2 (1) and (η6-C6Me6)Ru(S2C6H4) (2: S2C6H4 = 1,2-benzenedithiolate) react with an excess of hydrazine hydrate to afford a mononuclear η1-hydrazine complex (η6-C6H6)Ru(η1-NH2NH2)(S-2,6-C6H3Me2)2 (3) and a dinuclear μ-hydrazine complex [(η6-C6Me6)Ru(S2C6H4)]2(μ-NH2NH2) (4), respectively.
5,8,17,20-Tetrakis(3,5-di-t-butylphenyl)-6,7,18,19-tetradehydrotetrathia[24]annulene-(4.0.4.0) and Its Dianion: New Thiophene-Derived Paratropic and Diatropic Annulenes
Authors: Kurata Hiroyuki , Baba Hiroshige , Oda Masaji
Published: June 2004

5,8,17,20-Tetrakis(3,5-di-t-butylphenyl)-6,7,18,19-tetradehydrotetrathia[24]annulene (4.0.4.0) shows clear paratropicity (antiaromaticity) and highly amphoteric redox properties, whereas the dianion obtained by its alkali metal reduction strong diatropicity (aromaticity) as a novel 26π-electron system.
Synthesis and Photoinduced Electron Transfer Processes in Ru(II)(bpy)2/Os(III)(bpy)2-Based Triad Complexes Containing Functionalized Diimide Ligands
Authors: Hossain Md Delower , Haga Masa-aki , Monjushiro Hideaki , Gholamkhass Bobak , Nozaki Koichi , Ohno Takeshi
Published: June 2004

The charge separated(CS) state was efficiently formed as a result of stepwise electron transfer reactions in a novel Ru(II)(bpy)2-diimide-Os(III)(bpy)2 triad system (efficiency > 0.7); the rate of electron transfer and the charge separation yield were determined from picosecond time-resolved absorption spectra.
Synthesis and Structure of Unprecedented Carboxylate-bridged Heteronuclear Cr(III)-Nd(III) Complex
Authors: Sakagami Narumi , Tsunekawa Masayuki , Konno Takumi , Okamoto Ken-ichi
Published: June 2004

Chromium(III)-lanthanide(III) hetero-polynuclear complex was synthesized and characterized. The structure of [Cr2Nd3(μ-OOCCH3)6(μ-OH)6(H2O)9]Br3·NaBr·8H2O (1) was determined by X-ray analysis.
Preparation and Characterization of α-Amylase Immobilized Inorganic/Organic Hybrid Membrane Using Chitosan as a Dispersant in the Sol-Gel Process
Authors: Cho Gyoujin , Moon Il-Shik , Lee Jae-Suk
Published: June 2004

A new method for immobilizing α-amylase in a hybrid inorganic/organic membrane has been developed for the purpose of potential applications as a membrane bioreactor in aqueous phase. It has been found that chitosan can act as an enzyme-stabilizing host and a dispersant which can homogeneously mix an inorganic (SiO2) phase and an organic (polymer) phase. The optimum conditions in preparing the membrane were determined. The resulting microscopically homogeneous membranes were characterized by FT-IR, TGA, and water stability. It was found that the enzyme-incorporated membrane showed a very stable activity for the period of our experimental set-up (30 days).
Ag Coated SiC/YBCO Composite Prepared by the Plasma Activated Sintering Method
Authors: Kuroda Masanori , Yokogawa Kiyoshi , Tsutsumoto Takahiro , Yanagisawa Osamu
Published: June 2004

YBCO/Ag coated SiC composites containing 0.5, 1.0 and 3.0 wt% whisker were prepared by the conventional plasma activated sintering method (PAS) at 973-1,103 K. SiC whisker was covered with Ag thin film by electroless coating method to suppress interfacial reaction between superconductor and SiC whisker. It was shown that superconducting transition occured at 90 K in the specimen with 3 wt% of Ag coated SiC whisker.
Tellurium Nanorods and Nanowires Prepared by the Microwave-Polyol Method
Authors: Zhu Ying-Jie , Hu Xian-Luo
Published: May 2004

Tellurium nanorods and nanowires have been successfully prepared in liquid phase by the microwave-polyol method without using any seed, or template or surfactant. The reduction of tellurium dioxide by ethylene glycol and formation of Te nanorods and nanowires were achieved by microwave heating at 185 °C for 30 min. The as-prepared samples were characterized by X-ray powder diffraction and transmission electron microscope.
Phosphate-mediated ZnO Nanosheets with a Mosaic Structure
Authors: Imai Hiroaki , Iwai Satoko , Yamabi Satoshi
Published: May 2004

Seaweed-like ZnO sheets consisting of wurtzite-type nanoplates with a thickness less than 5 nm were grown in an aqueous solution system containing phosphate anions. The platy crystals were formed with specific adsorption of phosphate anions on the (001) plane.
Self-assembled Monolayer of Light-harvesting 1 and Reaction Center (LH1-RC) Complexes Isolated from Rhodospirillum rubrum on an Amino-Terminated ITO Electrode
Authors: Ogawa Makiko , Shinohara Kiyoshi , Nakamura Yukari , Suemori Yoshiharu , Nagata Morio , Iida Kouji , Gardiner Alastair T , Cogdell Richard J , Nango Mamoru
Published: May 2004

LH1-RC complexes isolated from Rhodospirillum rubrum were successfully assembled onto an ITO electrode modified with aminopropylsilane. Efficient energy transfer and photocurrent responses of the complexes were observed upon illumination at 880 nm.
Hybrid Reagent of Ammonium Hydrogen Fluoride and Scandium Triflate: Highly Efficient Catalyst for Ring-opening Fluorination of 2,3-Epoxyalcohols
Authors: Itoh Yoshimitsu , Jang Sejin , Ohba Siho , Mikami Koichi
Published: May 2004

Ring-opening fluorination of 2,3-epoxy-alcohol is one of the most important ways of introducing fluorine atom into functionalized organic compounds. Catalytic ring-opening fluorination is shown to give excellent yield (88%) by catalytic amount of scandium triflate (Sc(OTf)3) in DME.