bluuebunny/crossref_metadata_2025 huggingface dataset:
Intramolecular Coupling of Vinyl Ether and Olefins or Acetylenes with Ti(II) Reagent. Regio- and Stereo-selective Vinyltitanation of Carbon-Carbon Multiple Bonds
Authors: Nakajima Ryota , Urabe Hirokazu , Sato Fumie
Published: September 2002

Treatment of m-alkenyl (or m-alkynyl) vinyl ethers (m = 3,4) with a Ti(II) reagent generated most likely bicyclic oxatitanacycles, which eliminate the alkoxide tether to effect the selective vinyltitanation of the alkene or alkyne moiety to give m-vinyl-1-alkanols or m-vinyl-m-alken-1-ols.
Synthesis of (1R,3S,5S)-1,3,8-Trimethyl-2,9-dioxabicyclo[3.3.1]non-7-ene, the Male Pheromone of a Hepialid Moth Endoclita excrescens, and Its Enantiomer
Authors: Marukawa Kaoru , Mori Kenji
Published: September 2002

Both (1R,3S,5S)- and (1S,3R,5R)-isomers of 1,3,8-trimethyl-2,9-dioxabicyclo[3.3.1]non-7-ene were synthesized by starting from (S)- and (R)-isomers of ethyl 3-hydroxybutanoate, respectively. The (1R,3S,5S)-isomer was identified as the male sex pheromone of a Japanese hepialid moth, Endoclita excrescens.
A Novel Host-Guest Supramolecular Architecture of Dehydrocholic Acid in the Enantioselective Inclusion of R-(+)-Methyl p-Tolyl Sulfoxide
Authors: Bertolasi Valerio , Bortolini Olga , Fantin Giancarlo , Fogagnolo Marco , Medici Alessandro
Published: September 2002

The first crystal structure of a 1:1 inclusion complex between dehydrocholic acid and R-(+)-methyl p-tolyl sulfoxide, formed by intercalation layers, is reported.
Structural Control in Enzymatic Oxidative Polymerization of Phenols with Varying the Solvent and Substituent Nature
Authors: Mita Naruyoshi , Tawaki Shin-ichiro , Uyama Hiroshi , Kobayashi Shiro
Published: September 2002

Control of the coupling selectivity (regioselectivity) in the horseradish peroxidase-catalyzed oxidative polymerization of 4-substituted phenols has been achieved by changing the hydrophobic parameters of the monomer substituent and organic solvent (π and logP, respectively), yielding soluble polyphenols with a different ratio of phenylene/oxyphenylene units.
Morphological Change of Giant Vesicles Triggered by Dehydrocondensation Reaction
Authors: Takakura Katsuto , Toyota Taro , Yamada Koji , Ishimaru Masako , Yasuda Kenji , Sugawara Tadashi
Published: September 2002

A giant vesicle composed of an amphiphile with a reactive site exhibited a morphological change when the vesicular amphiphile reacts with an added amphiphilic reaction-partner within its membrane.
Coordinatively Unsaturated Ru(II) Species Ru(xantsil)(CO): A New Active Catalyst for Oligomerization/Deoligomerization of HSiMe2SiMe3 [xantsil=(9,9-Dimethylxanthene-4,5-diyl)bis(dimethylsilyl)]. Isolation of a Stabilized Form of the Silyl(silylene) Intermediates
Authors: Minglana Jim Josephus G , Okazaki Masaaki , Tobita Hiromi , Ogino Hiroshi
Published: September 2002

Ru(xantsil)(CO)(η6-C6H5CH3) (1) was found to be a catalyst for the oligomerization/deoligomerization of HSiMe2SiMe3 to give H(SiMe2)nMe (n=1–8). A possible mechanism involving a silyl(silylene) intermediate was strongly supported by the isolation of its stabilized form, i.e., alkoxy-bridged bis(silylene) complex which was characterized by X-ray crystal structure analysis.
An Amorphous Nanosized Tin-Zinc Composite Oxide as a High Capacity Anode Material for Lithium Ion Batteries
Authors: Yuan Zhengyong , Huang Feng , Sun Jutang , Zhou Yunhong
Published: September 2002

A new anode material for lithium ion batteries, ZnSnO3, was prepared through the pyrolysis of ZnSn(OH)6. The powder XRD analysis and TEM image demonstrated that the product is amorphous, the powder particles take the shape of square flake and the size is about 70 nm. Electrochemical measurements showed that the reversible capacity of the ZnSnO3 electrode was more than 800 mAh·g-1.
Synthesis of a PET-Clay Hybrid Material
Authors: Guozhen Zhang , Shichi Tetsuya , Zhiwei Tong , Takagi Katsuhiko
Published: September 2002

The hybridization of poly(ethylene terephthalate) (PET) with montmorillonite (Mont) was investigated by using hydroxyethyl isonicotinamide (HENA) as an ionic anchor monomer capable of being adsorbed onto clay surfaces by a pyridinyl group (-C5H5N). The hybrid films of HENA/Mont with bis(hydroxyethyl) terephthalate (BHET) exhibited favorable characteristics of being optically clear and transparent.
High Temperature PTC Thermistor Using Ba Cobaltite
Authors: Kinoshita Kazuya , Kusaba Hajime , Sakai Go , Shimanoe Kengo , Miura Norio , Yamazoe Noboru
Published: September 2002

It was found that partially Fe-substituted Ba cobaltite, BaCo0.7Fe0.3O3-δ, shows sharp PTC behavior at temperature above 850 °C. As revealed by XRD measurements, the PTC behavior is accompanied by phase transformation between hexagonal perovskite structure (low temperature) and cubic one (high temperature).
Oxidative Double Bond Cleavage of α-Substituted Styrenes with Molecular Oxygen
Authors: Hayashi Yujiro , Takeda Mitsuhiro , Miyamoto Yuji , Shoji Mitsuru
Published: September 2002

Oxidative cleavage of the carbon-carbon double bond of α-substituted styrene derivatives proceeds under an atmospheric pressure of molecular oxygen at the solventless conditions to afford the corresponding ketones in moderate yields with no requirement for transition metal catalysts or photo-activation.
Modulation of the Copper-Dioxygen Reactivity by Stereochemical Effect of Tetradentate Tripodal Ligands
Authors: Hayashi Hideki , Uozumi Kounosuke , Fujinami Shuhei , Nagatomo Shigenori , Shiren Kazushi , Furutachi Hideki , Suzuki Masatatsu , Uehara Akira , Kitagawa Teizo
Published: September 2002

Dioxygen reactivity of a copper(I) complex having a sterically hindered Me3-tpa and monooxygenase activity of its oxygenated species toward the ligand were significantly modulated by the presence of the 6-methyl group onto pyridyl group.
A Highly Selective and Coking-Resistant Catalyst for Methane Dehydrocondensation
Authors: Shu Yuying , Ohnishi Ryuichiro , Ichikawa Masaru
Published: September 2002

Acid reflux-dealuminated HMCM-22 supported Mo catalyst exhibits highly selective and coking-resistant catalytic performance for methane dehydrocondensation reaction, compared with conventional catalysts. The excellent catalytic stability of the dealuminated catalyst is based on the remarkable suppression of coke formation owing to the effective decrease of Brönsted acid sites, which are demonstrated by TPO, 1H NMR and NH3-TPD methods.
Synthesis of Single-Handed Helical Poly(1-dibenzosuberyl methacrylate) via Radical Polymerization in the Presence of an Optically Active Cobalt(II) Complex
Authors: Nakano Tamaki , Tsunematsu Kumiko , Okamoto Yoshio
Published: September 2002

The radical polymerization of 1-phenyldibenzosuberyl methacrylate in the presence of an optically active cobalt(II) complex led to an optically active polymer having a single-handed helical conformation.
Photoinduced Changes of Surface and Adsorbed Water in TiO2 Photocatalytic Systems as Studied by Solid State 1H-NMR Spectroscopy
Authors: Nosaka Atsuko Y , Fujiwara Toshimichi , Yagi Hiromasa , Akutsu Hideo , Nosaka Yoshio
Published: September 2002

1H-NMR spectra of TiO2 photocatalysts consist of two peaks with line widths of 500 Hz and 18 kHz. The sharp peak was attributed to physisorbed water, while the broader one is considered to correspond to the less mobile bound water or surface OH group. On UV illumination both peaks disappeared. The admission of air leads to the recovery of both peaks to some extent but in a different spectral feature for the broad peak, reflecting the surface structural change on TiO2 by photo illumination.
NMR Observation of Trialkylphosphite-Palladium(II) and Ruthenium(II) Complexes in Supercritical Carbon Dioxide
Authors: Kayaki Yoshihito , Suzuki Tomoyuki , Noguchi Yushi , Sakurai Satoshi , Imanari Mamoru , Ikariya Takao
Published: September 2002

A supercritical fluid nuclear magnetic resonance (scNMR) spectroscopic method has been developed using a commercially available NMR spectrometer equipped with a high-pressure zirconia cell, revealing that trialkylphosphite ligands are highly effective for increasing the solubility of dichloropalladium(II) and dichlororuthenium(II) complexes in supercritical carbon dioxide (scCO2).
Samarium(III) Tris(2,6-di-tert-butyl-4-methylphenoxide): Preparation, Properties, and Catalytic Activity in the Michael Type Reaction
Authors: Katagiri Kosuke , Kameoka Miyuki , Nishiura Masayoshi , Imamoto Tsuneo
Published: September 2002

Samarium(III) tris(2,6-di-tert-butyl-4-methylphenoxide) (1), which is a highly coordinatively unsaturated complex, was prepared by the reaction of samarium(III) iodide with sodium 2,6-di-tert-butyl-4-methylphenoxide, and the crystal structure of its acetonitrile complex was determined by X-ray analysis. Complex 1 catalyzed the sequential Michael-Michael-aldol reaction of 3,3-dimethyl-2-butanone with benzalacetophenone.
Pictet–Spengler Reaction of Nitrones and Imines Catalyzed by Yb(OTf)3–TMSCl
Authors: Tsuji Riichiro , Yamanaka Masamichi , Nishida Atsushi , Nakagawa Masako
Published: September 2002

The Pictet–Spengler reaction of nitrones and imines prepared from N-hydroxytryptamine and tryptamine gave the corresponding tetrahydro-β-carbolines in excellent yields in the presence of Yb(OTf)3–TMSCl in a mixture of CH2Cl2 and THF.
Synthesis and Characteristics of Novel Fixed Carrier Membrane for CO2 Separation
Authors: Zhang Ying , Wang Zhi , Wang Shichang
Published: September 2002

Permeation of CO2 was investigated by using synthetic polymeric membranes having secondary amine and carboxyl groups which can act as carriers for CO2. Selectivity of CO2 over CH4 was measured. The membranes possessed better CO2 permeance than that of other fixed carrier membranes reported in literature.
Structure Analysis of Highly S4-Ruffled Bis(2-methylimidazole)(meso-tetraethylporphyrinato)iron(III) Chloride
Authors: Ohgo Yoshiki , Ikeue Takahisa , Saitoh Takashi , Nakamura Mikio
Published: September 2002

The X-ray crystallographic analysis of low spin bis(2-methylimidazole)(meso-tetraethylporphyrinato)iron(III) has revealed that the porphyrin ring is highly S4-ruffled and that the maximum deviation of the meso-carbon from the least-squares plane of the [Fe(C20N4)] core reaches as much as 0.73(1) Å.
Syntheses of Ruthenium(II) Complexes with Pentadentate Ligands and Catalytic Oxidation of Alkane Using 2,6-Dichloropyridine N-Oxide
Authors: Yamaguchi Motowo , Ichii Yoshiki , Kosaka Shoko , Masui Dai , Yamagishi Takamichi
Published: September 2002

The new ruthenium(II) complexes having pentadentate ligands, [RuCl(N4PY)]Cl and [Ru(N2PY2O) (Me2SO)] were prepared.1,2 Catalytic oxidation of adamantane using MCPBA or 2,6-dichloropyridine N-oxide as cooxidant has been examined. Using N-oxide in the presence of a small amount of MCPBA or Ce(IV) ion (0.5–5 mol% vs substrate) the ruthenium complexes exhibit considerable catalytic activity, and that with the ligand having carboxylate groups is found to be more active.
Humidity-Sensitive Color Changes of Ionic Dyes in Solid Thin Film of Sugar Gel
Authors: Matsushima Ryoka , Ogiue Atsushi , Kohno Yoshiumi
Published: September 2002

Solid thin films of sugar gels containing ionic dyes, such as flavylium perchlorates and Methylene Blue, revealed reversible color changes toward the changes in temperature and humidity. Absorption spectra of the thin films revealed extended aggregates with only a weak shoulder of the dye monomer even at high temperature, as compared with aqueous hydrogel matrices which showed strong monomer band. The thin films revealed good reversibility toward temperature changes and moderate reversibility toward humidity changes.
Novel Synthesis of 1,3-Disubstituted Alkyl- and Aralkylnaphthalenes from Methylenetriphenylphosphorane, 1,1-Disubstituted Epoxides, Paraformaldehyde, and Trimethylsilyl Triflate
Authors: Okuma Kentaro , Hirose Yoshitaka , Shioji Kosei
Published: September 2002

A novel approach toward the synthesis of 3-methylnaphthalenes is achieved by the reaction of 3-methylene-5,5-disubstituted tetrahydrofurans derived from methylenetriphenylphosphorane, 1,1-disubstituted epoxides and paraformaldehyde with trimethylsilyl trifluoromethanesulfonate in the presence of diisopropylethylamine.
TiCl4-Zn Induced Reductive Acylation of Ketones with Acylsilanes
Authors: Sakurai Hidehiro , Imamoto Yuka , Hirao Toshikazu
Published: September 2002

Acylsilanes were found to react with ketones in the presence of a low-valent titanium reagent generated from titanium(IV) chloride and zinc, giving the corresponding reductive acylated compounds.
Supercritical CO2 Phase Intercalation of n-Dodecylamine with Cation Exchanged Expandable Micas
Authors: Shi Tie-Pan , Yao Ken , Nishimura Satoshi , Imai Yusuke , Yamada Noriyuki , Abe Eiichi
Published: September 2002

A series of cation exchanged expandable fluorine micas exhibiting various swelling properties have been intercalated by neutral n-dodecylamine via supercritical CO2.
An Efficient Method for the Direct Evaluation of the Excess Entropy for Two-Center-Lennard-Jones Liquids Using the Average of Scaled Acceptance Ratios
Authors: Hong Seung Do , Jang Du-Jeon
Published: September 2002

We present a direct evaluation of the excess entropy for two-center-Lennard-Jones liquids from the canonical ensemble average of scaled acceptance ratios during a single Monte Carlo or molecular dynamics simulation. The scaled acceptance ratios are averaged over virtual random configurations generated by separate parallel Monte Carlo procedures. No reference system is needed except the ideal gas and so the absolute excess entropy is obtained. The method is extremely efficient.
Conversion of CFC-13 to Trifluoroacetic Acid by Electrochemical Reaction with Carbon Dioxide
Authors: Sonoyama Noriyuki , Sakata Tadayoshi
Published: September 2002

The electrochemical conversion of CFC-13 (CClF3) and carbon dioxide into trifluoroacetic acid (TFAA) was attempted at a Ag wire electrode under high pressure. TFAA was efficiently produced and the current efficiency was slightly dependent on the potential during electrolysis and pressure of co-existing carbon dioxide.
Observation of Self-Oscillation of Electrical Potential Difference in Organic Phase of Water-Oil-Water Liquid Membrane System
Authors: Yoshidome Toshifumi , Takahama Jun , Mitsushio Masaru , Higo Morihide
Published: September 2002

Electrical potential differences were measured between two points in an organic phase of a water-oil-water liquid membrane system in which self-oscillations of an electrical potential difference across the three-phases-liquid membrane were observed. The electrical potential difference between two points in the organic phase was oscillated in the same way as did that across the three phases.
Selective Carbonylation of Methanol to Dimethyl Carbonate by Gas–Liquid–Solid-Phase Boundary Electrolysis
Authors: Yamanaka Ichiro , Funakawa Akiyasu , Otsuka Kiyoshi
Published: September 2002

Selective and efficient electrochemical carbonylation of MeOH to DMC was performed over PdCl2/VGCF (vapor grown carbon fiber) anode by utilizing the three-phase boundary electrolysis at 1 atm (CO) and 298 K.
A Novel Phthalocyanine-based Dimer Linked by a Silver Ion: Structural Control of Self-assembled Dimers
Authors: Ishii Kazuyuki , Watanabe Yoko , Abiko Satoko , Kobayashi Nagao
Published: September 2002

A novel phthalocyanine-based dimer, which is a di-nuclear pyridino-tri-tert-butylbenzotetraazaporphinatozinc linked by a silver ion, has been synthesized to control the states of assembly and characterized using electronic absorption and magnetic circular dichroism spectroscopy.
Acoustic Cavitation-assisted Decomposition of 4-Nonylphenol in Water
Authors: Yim Bongbeen , Maeda Yasuaki
Published: September 2002

Acoustic cavitation-assisted decomposition of 4-nonylphenol in water takes place through OH radical-attack and pyrolysis at the cavitation bubble interface and in the bulk solution. The cavitation-induced physical and chemical effects by addition of Fe2+ and Fe3+ play an important role in the enhancement of 4-nonylphenol decomposition.
Direct Preparation of Anhydrous Sodium Oligosulfides from Metal Sodium and Elemental Sulfur in Aprotic Organic Media Directed toward Synthesis of Silane Coupling Agent
Authors: Yamada Nobuo , Furukawa Mutsuhisa , Nishi Masayuki , Takata Toshikazu
Published: September 2002

Anhydrous sodium oligosulfide was prepared by the heterogeneous reaction of metal sodium and elemental sulfur in aprotic solvents. The oligosulfide consisted of a mixture of several Na2Sn (n=2-8). Organic oligosulfides (R2Sn, n≥2) including moisture-sensitive one were synthesized by the reaction with organic halides in high yeilds under mild conditions.
Novel Prediction Methods for Electrochemical Reduction Characteristics of Chlorinated Aromatics Based on Their Molecular Structures
Authors: Wei Dongbin , Hu Hong-Ying , Hiramoto Kosei , Fujie Koichi
Published: September 2002

A significant quantitative model for predicting reduction characteristic based on the molecular structure, and an empirical estimation method as well, were investigated by using structure-property relationship technique for 87 chlorinated aromatics. These would throw more light on the nature of reduction process, and provide valuable data for designing and choosing a possible (electro-) chemical oxidation/reduction treatment process of chlorinated aromatics.
High Aspect Ratio Gold Nanorods Grown Normal to High-Energy Surfaces
Authors: Yao Hiroshi , Onishi Tsuguo , Sato Seiichi , Kimura Keisaku
Published: September 2002

Gold nanorods were electrochemically prepared in aqueous micellar solutions consisting of a supporting electrolyte surfactant and a hydrophobic cosurfactant. With the selection of cosurfactant, the nanorods grew to be submicrometers in length with very high aspect ratios. The growth axial direction of the rod was revealed to be [110], the direction normal to high-energy surfaces, by electron diffraction measurements.
Double Nucleophilic Addition of Thiols and Allylstannane to α, β-Unsaturated Aldimines Promoted by Titanium Tetrachloride
Authors: Shimizu Makoto , Nishi Takafumi
Published: September 2002

In the presence of TiCl4, a mixture of thiol and tetraallyltin underwent 1,4- and 1,2-addition, respectively, with α, β-unsaturated imines to give 6-sulfenyl-4-amino-1-alkenes in good yields.
Sulfido-Bridged IrRh2 Clusters Derived from (Hydrogensulfido)iridium Complexes and Dirhodium Fragment. Comparison between Hydrido–Hydrogensulfido and Bis(hydrogensulfido) Systems
Authors: Matsubayashi Akihiro , Kuwata Shigeki , Ishii Youichi , Hidai Masanobu
Published: September 2002

Treatment of [Rh(μ2-Cl)(cod)]2 (cod=1,5-cyclooctadiene) with the hydrido–hydrogensulfido complex [Cp∗IrH(SH)(PMe3)] (Cp∗=η5-C5Me5) in the presence of triethylamine afforded the hydrido–mono(sulfido) complex [Cp∗Ir(PMe3)(μ2-H)(μ3-S){Rh(cod)}{RhCl(cod)}], whereas the corresponding reaction with the bis(hydrogensulfido) complex [Cp∗Ir(SH)2(PMe3)] gave the bis(sulfido) complex [Cp∗Ir(μ3-S)2{Rh(cod)}2] with liberation of trimethylphosphine.
A Rational Low-Temperature Approach to the Synthesis of Gladiate Ruthenium Nanoparticles
Authors: Xiao Jianping , Xie Yi , Luo Wei
Published: September 2002

Herein, a rational low-temperature approach has been successfully developed to prepare gladiate Ru nanoparticles with a pure hexagonal phase, which were confirmed by XRD, XPS, and TEM results. The reason for the formation of gladiate particles was also discussed.
Ircinamine, a Novel Cytotoxic Alkaloid from Ircinia sp.
Authors: Kuramoto Makoto , Fujita Tohru , Ono Noboru
Published: September 2002

Ircinamine was isolated from the marine sponge Ircinia sp., and its structure was elucidated by detailed spectroscopic analysis. This novel compound showed moderate activity against the murine leukemia cell line P388.
Molecular Assembly of Light-harvesting Antenna Complex on ITO Electrode
Authors: Ogawa Makiko , Kanda Ritsuko , Dewa Takehisa , Iida Kouji , Nango Mamoru
Published: September 2002

Light-harvesting (LH) antenna complex was successfully self-assembled on an ITO electrode modified with 3-aminopropyltriethoxysilane (APS-ITO). The reconstitution of the LH complex using LH polypeptides, isolated from photosynthetic bacteria, with Zn-BChl a formed an excitonically coupled state of Zn-BChl a complex on the electrode. Near infra-red (NIR) absorption and IR spectra indicated that the excitonically coupled Zn-BChl a and the LH polypeptides in an α-helical configuration were assembled on APS-ITO.
Electron-Link between Bacterial Luciferase and Electrochemically Sensitized Ru(bpy)32+∗-Methylviologen System within Nafion Membrane
Authors: Karatani Hajime , Tsujimura Yutaka , Hirayama Satoshi
Published: September 2002

Bacterial luciferase was linked with the electrochemically induced electron transport system, involving the dπ∗ triplet state tris(2,2′-bipyridine)ruthenium(II) and N,N′-dimethyl-4,4′-bipyridinium (MV2+), within a Nafion membrane.
The First Experimental Simulation of Thermal Transformation of Chlorophylls into Benzoporphyrins in Sediments
Authors: Kozono Masaki , Nomoto Shinya , Shimoyama Akira
Published: September 2002

Heating of chlorophyll a was performed at 350 °C for 12 h in relation to the origin of sedimentary benzoporphyrins. The product was oxidized by chromic acid to give phthalimide and its methyl homologs, which indicated the formation of benzopyrrole units in the substrate or its degraded fragments. The heating also produced a monomethylpyrrole unit, suggesting that a vinyl group of the chlorophyll was used as a part of the thermally generated benzopyrrole units.
Stereoselective Preparation and Crystal Structures of ΔΛ- and ΔΔ-[Hg{Co(aet)2(en)}2]4+ (aet=2-Aminoethanethiolate): Conversion of a Racemic CoIIIHgII Dinuclear to an Optically Active CoIIIHgIICoIII Trinuclear Structure
Authors: Konno Takumi , Honda Hirokazu , Chikamoto Yu , Kawamoto Tatsuya , Yoshimura Takashi , Hirotsu Masakazu
Published: September 2002

The reaction of [HgBr2{Co(aet)2(en)}]+ with [Ni{Co(aet)2(en)}2]4+ selectively gave the meso isomer of an S-bridged CoIIIHgIICoIII trinuclear complex, ΔΛ-[Hg{Co(aet)2(en)}2]4+ (ΔΛ-[1]4+), while the optically active ΔΔ isomer of [1]4+ was produced by the corresponding reaction with trans(N)-[Co(D-pen-N,O,S)2]-.
Effects of Titanium Oxide on the Optical Properties of Cerium Oxide
Authors: Masui Toshiyuki , Fukuhara Keisuke , Imanaka Nobuhito , Sakata Takao , Mori Hirotaro , Adachi Gin-ya
Published: September 2002

Cerium oxide and CeO2-TiO2 mixed oxide particles were prepared using sol-gel method. Addition of TiO2 changed the apparent bandgap energy to shift the UV-absorption edge to higher wavelengths, and the maximum UV-A absorption was attained in the 50CeO2-50TiO2 (in mol%) sample. The results on XRD and TEM showed that crystallinity of the particles became lower with increasing in the TiO2 content, and both thermal- and photo-catalyses were deactivated by the formation of CeO2-TiO2 mixed oxides.
Photochromic Films Prepared by Oxidation Polymerization of a Diarylethene Having Phenol Moieties
Authors: Uchida Kingo , Takata Atsushi , Nakamura Shinichiro , Irie Masahiro
Published: September 2002

Photochromic films containing diarylethene chromophores were prepared by oxidation polymerization of a diarylethene having phenol moieties. Upon alternate irradiation with UV and visible light, the polymer films exhibited coloration/decoloration cycles. The films were amorphous and kept the state after one year storage at room temperature.
Mg-Promoted Stereoselective Desulfonation of β-Arylvinyl Sulfone Derivatives
Authors: Nishiguchi Ikuzo , Matsumoto Takeshi , Kuwahara Takeshi , Kyoda Makoto , Maekawa Hirofumi
Published: September 2002

β-Arylvinyl p-tolylsulfones, easily prepared from base-catalyzed condensation of aromatic aldehydes with a variety of p-tolylsulfones, were efficiently transformed to the corresponding (E)-β-substituted aromatic olefins in a stereoselective manner through Mg-promoted reduction. The reaction may be initiated through electron transfer from Mg metal to the vinyl sulfones to give the corresponding anionic species followed by stereoselective elimination of a sulfonyl group.
Reversible Morphological Changes Induced by the Photodimerization of Bis (4-Octadecyloxystilbazolium) Isophthalate Films
Authors: Ohtani Osamu , Kato Hiroki , Takagi Katsuhiko
Published: September 2002

Anti-parallel stacked lamellar films of N-methyl-4-octadecyloxystilbazolium arylcarboxylates (C18O-Stz+X-) were found to undergo reversible layer expansion and shrinkage along the c-axis on the glass plates under alternative illumination at λ>350 and 254 nm. The stacked lamellar units changed in length according to the phase transition of the lamella structure induced by the photochemical [2+2] cyclodimerization and cycloreversion of C18O-Stz+X- in the organized assembly.
A New Thermal Polycondensation of Alanine in Molten Urea
Authors: Terasaki Masanori , Nomoto Shinya , Mita Hajime , Shimoyama Akira
Published: September 2002

Heating of alanine with urea afforded polyalanine containing a hydantoin ring at the N-terminal position. Molecular weight of the polymer was lower than 8000, as estimated by dialysis of the product. Molten urea was considered to facilitate spontaneous polymerization of alanine as well as to act as a dehydrating agent.
Redox Chemistry of Dinuclear Molybdenum Dithiolene Complexes. Interconversion of the Bridging Disulfide and Sulfides
Authors: Miki Yasunori , Takagi Hideaki , Ichimura Akio , Akashi Haruo , Shibahara Takashi
Published: September 2002

The redox properties of a photochromic dinuclear molybdenum complex, [Mo2(μ-S2)(μ-S2C2Ph2)2(S2C2Ph2)2] (1), were examined. Conventional and thin-layer cyclic voltammetric measurements showed that 1 undergoes two-electron reduction followed by chemical reactions to give [Mo2(μ-S)2(S2C2Ph2)4]2- (2), which was structurally characterized by X-ray crystallography. The overall two-electron oxidation product of 2 was converted to 1 via formation of four bonds.
A Novel 2D Mn(II)-Disulphide Complex [Mn(2,2′-DTDN)(H2O)2]n·2nH2O
Authors: Zhu Jixiong , Zhao Yingjun , Hong Maochun , Sun Daofeng , Shi Qian , Cao Rong
Published: September 2002

A novel two-dimensional layer manganese(II)-disulphide complex, [Mn(2,2′-DTDN)(H2O)2]n·2nH2O (DTDN2-=dithiodinicotinate) was synthesized and characterized, in which DTDN2- comes from the oxidation of MNA (2-mercaptonicotinic acid) followed by a deprotonation process in aqueous solution under aerobic condition. Hydrogen bond interactions among layers lead to the formation of three-dimensional network structure.
One-Shot-Laser-Pulse-Induced Cooperative Charge Transfer Accompanied by Spin Transition in a Co-Fe Prussian Blue Analog at Room Temperature
Authors: Shimamoto Naonobu , Ohkoshi Shin-ichi , Sato Osamu , Hashimoto Kazuhito
Published: September 2002

A one-shot-laser-pulse (6 ns) irradiation converted the electronic state of Na0.68Co1.20[Fe(CN)6]·3.7H2O from FeII(S=0)-CN-CoIII(S=0) to FeIII(S=1/2)-CN-CoII(S=3/2) at room temperature. This photochemical reaction was observed only above the power density of 45 mJ pulse-1 cm-2, and its quantum yield amounted to about 200%.
Efficient Photochemical Water Oxidation by a Molecular Catalyst Immobilized onto Metal Oxides
Authors: Shiroishi Hidenobu , Nukaga Mieko , Yamashita Satoshi , Kaneko Masao
Published: September 2002

Photocatalytic water oxidation with a sacrifical electron acceptor has been studied using a ruthenium complexes adsorbed onto metal oxides as an active water oxidation catalyst. The amount of the O2 evolved with the complex incorporated into RuO2 was five to fourteen times as large as that with RuO2.
H-Aggregation of Methyl Reds by the Hybridization of DNA-Dye Conjugates
Authors: Asanuma Hiroyuki , Shirasuka Kenji , Komiyama Makoto
Published: September 2002

Two DNA-dye conjugates, which are complementary with each other, were prepared by incorporating 1,3-propanediol and Methyl Reds on D-threoninol alternately into natural DNA. By hybridizing the two strands, Methyl Reds H-aggregates were formed in the duplex.
Complexing Ability of p-tert-Butylthiacalix[6]arene toward Metal Ions. Predominant Effect of Coordination by the Bridging Sulfur Rather than That of the Ring-Size
Authors: Morohashi Naoya , Iki Nobuhiko , Aono Mitsuru , Miyano Sotaro
Published: September 2002

p-tert-Butylthiacalix[6]arene extracted soft to intermediate metal ions to the same extent as the [4] counterpart did, indicating that the O-,S,O--tridentate binding manner rather than the effect of ring extension is critical to determine the complexing ability.
Cobalt “Single-coronet” Porphyrin Bearing Hydroxyl Groups in Its O2 Binding Site as a New Model for Myoglobin and Hemoglobin: Observation of Unusually Low Frequency of ν(O-O) in Resonance Raman Spectrum
Authors: Nakayama Shinya , Tani Fumito , Matsu-ura Mikiya , Naruta Yoshinori
Published: September 2002

The resonance Raman spectrum of oxy CoSCP with AdIm(2-H) showed an unusually low ν(O-O) frequency at 1123 cm-1. This result is due to the cooperative effect of strong donation from AdIm(2-H) and hydrogen bonding between the inner hydroxyl groups and coordinated dioxygen.
Preparation and Photocatalysis of Ordered Mesoporous Mg-Ta Mixed Oxide
Authors: Uchida Miwa , Kondo Junko N , Lu Daling , Domen Kazunari
Published: September 2002

An ordered mesoporous Mg-Ta mixed oxide (123 m2·g-1 BET surface area, ca. 5.0 nm mesopore size and 3.6 nm wall thickness), which was stable after calcination at 500 °C for 30 h, showed stable and high photo-catalytic activity for overall water decomposition.
New Phase Formation of Dimyristoylphosphatidylglycerol Bilayer-Assembly with Sodium or Ammonium Ions: Gelation Phenomena in the Lamellar Liquid Crystals Aged in Water
Authors: Tajima Kazuo , Tsutsui Takahiro , Imai Yoko , Nakamura Akio , Koshinuma Masakatsu
Published: September 2002

The thermal properties of lamellar phases of dimyristoylphosphatidylglycerol (DMPG) bilayer-assemblies with counter ions of Na+ and NH4+ are remarkably different. However, these lamellar phases of NaDMPG and NH4DMPG in water have been found to undergo a new gelation in common when they are aged for a couple of weeks below 40 °C. The new gel phases named Gel-2 reversibly change to the corresponding liquid crystal phases (LC-2) at transition temperatures (TI) of 40 °C for NaDMPG and 44 °C for NH4DMPG, respectively.
Unique Nanometer-Thick Layered Network
Authors: Jung Ok-Sang , Kim Yun Ju , Lee Young-A , Yoo Kyung Ho
Published: September 2002

4,6-Bis(2′-pyridylthio)pyrimidine coordinates to three Ag(I) ions in a bridged tridentate fashion to generate the anion exchangeable nanometer-thick layered network.
Fabrication and Electrochemical Characterization of Boron-Doped Diamond Microdisc Array Electrodes
Authors: Tsunozaki Kentaro , Einaga Yasuaki , Rao Tata N , Fujishima Akira
Published: September 2002

Microdisc array (MDA) electrodes of boron-doped diamond (BDD) were fabricated on structured silicon substrates. The BDD-MDA electrodes exhibited sigmoidal voltammetric curves, which show that they function as assemblies of single microelectrodes. The microelectrode behavior was also confirmed with biologically important species such as ascorbic acid and 3,4-dihydroxyphenylacetic acid, indicating its applicability in electroanalysis.
Hydrothermal Process for Increasing Acetic Acid Yield from Lignocellulosic Wastes
Authors: Jin Fangming , Zheng Junchao , Enomoto Heiji , Moriya Takehiko , Sato Naohiro , Higashijima Hisao
Published: September 2002

To increase the acetic acid yield in a wet oxidation of lignocellulosic wastes, a new two-step reaction process is proposed. The first step produces 5-hydroxymethyl-2-furaldehyde (HMF) and 2-furaldehyde (2-FA) by dehydration of monosaccharides which are formed by hydrolysis of polysaccharides under the condition of non-supply of oxygen. In the second step, HMF and 2-FA are oxidized to acetic acid with oxygen newly added. The yield increased about twofold.
Electrochemistry of 2′-Anthraquinone-modified Oligonucleotide Immobilized on Gold Surface: Differential Electron Transfer Efficiency between Single and Double Helical Forms
Authors: Yamana Kazushige , Kumamoto Satoshi , Hasegawa Tetsuya , Nakano Hidehiko , Sugie Yosohiro
Published: September 2002

2′-Anthraquinone-modified oligonucleotide (AQ-ODN) possessing a disulfide terminus has been immobilized on gold surface. The AQ-ODN modified electrode exhibited faster electron transferability in double-stranded form than that in single-stranded form, providing a new type of electrochemical DNA sensing device.
Synthesis, Structure and Nonlinear Optical Properties of a Novel Cluster Compound Containing 1,1′-Bis(diphenylphosphino)ferrocene(dppf)
Authors: Cai Ya , Song Yinglin , Zheng Hegen , Niu Yunyin , Du Chenxia , Xin Xinquan
Published: September 2002

A novel cluster WCu2S4(dppf)2·4DMF was synthesized by the reaction of (NH4)2WS4 with CuCl and 1,1′-bis(diphenylphosphino)ferrocene (dppf) in the solid state, and its crystal structure has been characterized by X-ray diffraction. The cluster has a novel new skeletal structure with five metal atoms nearly in a line. Investigation of third-order optical nonlinear z-scan shows that it exhibits good nonlinear optical properties in a 1.2×10-4 mol·dm-3 DMF solution.
Photoinduced Electron Transfer Reaction of Tetraazathiapentalenes with Trialkylamines
Authors: Hayashi Hirokazu , Matsumura Noboru , Mizuno Kazuhiko
Published: September 2002

The photoinduced electron transfer reaction of tetraazathiapentalenes with trialkylamines gives thiourea derivatives by dialkylamination of isothiocyanate derivatives, through radical anions of tetraazathiapentalenes and radical cations of trialkylamines.
Photophysical and Photochemical Properties of Decakis-Adduct of C120 and Related Compounds
Authors: Fujitsuka Mamoru , Fujiwara Koichi , Murata Yasujiro , Ito Osamu , Komatsu Koichi
Published: September 2002

Photophysical and photochemical properties of a decakis-adduct of C120 and related compounds were investigated. Ground state absorption spectrum of the C120 derivative showed structureless feature due to the interaction of fullerene-cages. The fluorescence quantum yields of the adducts showed ten times increase compared with pristine C60, while they were 1/6 of a hexapyrrolidine derivative of C60. Triplet absorption bands appeared at 670 nm. The quantum yields for the intersystem crossing of the adducts were as small as 0.12–0.19.
New Large-Scale Preparations of Versatile 6-O-Monotosyl and 6-Monohydroxy Permethylated α-, β-, and γ-Cyclodextrins
Authors: Kaneda Takahiro , Fujimoto Tatsuhiko , Goto Jun’ichiro , Asano Kaori , Yasufuku Yoshitaka , Jung Jone Hwa , Hosono Chiaki , Sakata Yoshiteru
Published: September 2002

New practical methods for preparation of versatile 6-O-monotosyl and 6-monohydroxy permethylated α-, β-, and γ-cyclodextrins are described.
Enhanced Binding Ability of β-Cyclodextrin Bearing Seven Hydrophobic Chains Each with a Hydrophilic End Group
Authors: Imamura Kazuhisa , Ikeda Hiroshi , Ueno Akihiko
Published: September 2002

Seven adipic acid units each with a D-glucamine unit at the end were introduced to primary hydroxyl side of β-cyclodextrin to enlarge the hydrophobic cavity. The modification remarkably enhanced the binding ability for larger guests.
Heavy-Row Atom Effects on the Strength of the Weak Nonbonded Interactions between Divalent Selenium and Halogen Atoms
Authors: Iwaoka Michio , Katsuda Takayuki , Tomoda Shuji , Harada Jun , Ogawa Keiichiro
Published: September 2002

The 77Se NMR chemical shifts observed for 2-selenobenzyl halide derivatives and the density functional theoretical calculation revealed that the strength of intramolecular nonbonded interactions between a divalent selenium and halogen atoms decreases in the order, Se···F>Se···Cl≥Se···Br.
Development of Efficient Fluorosensors for the Transition Metal Ions by Tuning of Photoinduced Intramolecular Electron Transfer (PIET) Communication between the Components
Authors: Badugu Ramachandram
Published: September 2002

4-Methoxy-1,8-naphthalimide derivatives, 1 and 2, with improved PIET interaction, show significant fluorescence enhancement in the presence of transition metal ions.
Catalytic Activity of Multiwalled Carbon Nanotubes for the Oxidation of Nitric Oxide
Authors: Zhao Guang-Chao , Wu Fang-Hui , Wei Xian-Wen
Published: September 2002

The acid-treated Multiwalled Carbon Nanotubes (MWNTs) was dropped on the surface of glassy carbon electrode to form a modified electrode. The MWNTs showed the strong catalytic activity for the electrochemical oxidation of nitric oxide (NO) and the catalytic currents were proportional to the NO concentrations in submicromolar range.
Halogenolactamization of 2-(3-Butenyl)-1,3-oxazolines to Bifunctional γ- and δ-Lactams
Authors: Terao Keiji , Takechi Yumiko , Kunishima Munetaka , Tani Shohei , Ito Akiko , Yamasaki Chisa , Fukuzawa Shin-ichi
Published: September 2002

Under new conditions described herein, halogenolactamization of 2-(3-butenyl)-1,3-oxazolines (1) proves to be a successful approach for producing 1,5-bis(halogenoalkyl)-γ-lactams (3). A variety of halogens can be introduced by using reagents such as I2, I2/CuCl2, I2/CuBr2, and Br2 under dry conditions.
Sub-Microstructures Formed by Means of Reactive Ion Etching in Multilayers of Two-Dimensional Fine-Particle Arrays
Authors: Matsushita Sachiko I , Yagi Yoshie , Fujishima Akira
Published: September 2002

Highly attractive periodic sub-microstructures were formed in multilayers of two-dimensional fine-particle arrays by means of an oxygen-plasma etching technique. The enhancement of anisotropic etching in multilayers produced these attractive structures, since polystyrene particles (1 μm diameter) in the top layer had worked as protective sidewalls at high power (over 100 W) and low pressure (20 mPa).
Optical Absorption Properties of Three-Dimensional Au Nanoparticle Crystals
Authors: Sato Seiichi , Yao Hiroshi , Kimura Keisaku
Published: September 2002

Optical absorption properties of Au nanoparticle crystals are studied in the near infrared-to-near ultraviolet region. Although sparsely deposited Au nanoparticles show a small absorption peak at 2.4 eV, the Au nanoparticle crystals show a significantly stronger peak at 1.9 eV. Altering the temperature from room temperature to 77 K brings about very little difference in the intensity and width of the absorption peak. A qualitative model of the electronic polarizability is introduced to explain the observed peak shift as a result of assembling the nanoparticles into the 3D lattices.
Formation of Nanoparticle Arrays at the Interlayer of Aqueous Phosphate Bilayers
Authors: Yonezawa Tetsu , Onoue Shin-ya , Kimizuka Nobuo
Published: September 2002

Nanoparticle arrays were obtained by simply mixing anionic bilayer membranes and cationic, quaternary ammonium-stabilized gold nanoparticles under ultrasonication. The particles were immobilized densely into the hydrophilic interlayers of the dispersed lamellar structures and formed quasi one-dimensional structure.
Molecular Reactor for Solution Chemistry
Authors: Kaneko Masao , Mochizuki Nichiomi , Suzuki Kazuhisa , Shiroishi Hidenobu , Ishikawa Kazunori
Published: September 2002

It was for the first time demonstrated that in a tight and stable solid made of polysaccharides such as carrageenan and agarose containing water, electrochemical and photochemical reactions can take place the same as in pure water.
Convenient Synthesis of Zeolite Beta in Basic Media without Alkali Metal Cations
Authors: Guo Wanping , Li Quanzhi
Published: September 2002

A convenient approach has been developed to synthesize zeolite Beta with SiO2/Al2O3 ratios from 14.2 to infinity using tetraethylammonium hydroxide as the structure-directing agent (SDA) in absence of alkali metal cations.
Gas Permeation Properties of Flexible Pyrolytic Membranes from Sulfonated Polyimides
Authors: Zhou Weiliang , Watari Tatsuya , Kita Hidetoshi , Okamoto Ken-ichi
Published: September 2002

Polyimides were prepared from dianhydride with planar structure and Cardo-type or bulky-group-containing [-C(CF3)2-] diamines. Dense and flexibile flat membranes produced by the pyrolysis at relatively low temperature displayed high separation performance for C3H6/C3H8 and CO2/N2 gas pairs.
Liquid Crystal Properties of 4-Alkoxy-3-nitrobenzoic Acids
Authors: Tasaka Takeyasu , Okamoto Hiroaki , Morita Yuki , Kasatani Kazuo , Takenaka Shunsuke
Published: September 2002

For the homologous series of 4-alkoxy-3-nitrobenzoic acids the nonyloxy and the higher members exhibit a smectic A phase, where the layer spacings are 1.5–1.6 times of the fully extended molecular lengths.
Solvothermal Synthesis of Complex Fluorides KCoF3 and KNiF3
Authors: Hua Ruinian , Jia Zhihong , Xie Demin , Shi Chunshan
Published: September 2002

Complex fluorides KCoF3 and KNiF3 with perovskite structures were solvothermally synthesized at 120–180 °C and characterized by means of X-ray powder diffraction, scanning electron microscopy, thermogravimetric analysis and infrared spectroscopy.
Determination of Hg22+ Ions Using the Specific Reaction with a Picolinic Acid N-Oxide Modified Electrode
Authors: Kong Young-Tae , Choi Gyeong-Hee , Won Mi-Sook , Shim Yoon-Bo
Published: September 2002

A modified carbon paste electrode that specifically reacts with Hg22+ ions in a Hg2+ and Hg22+ mixed solution has been constructed by incorporating picolinic acid N-oxide into graphite powders. After a preconcentration in a Hg22+ and Hg2+ ion solution (pH 2.0), this electrode shows a well-defined anodic stripping peak for only Hg22+ ion and a linear response between 3.0×10-8 M and 1.0×10-6 M of Hg22+ ion. The electrode has been successfully applied to the selective determination of trace Hg in the human urine sample.
Generation and Detection of a Dithia Dication Derived from 4,9-Diethyl- [1,4]dihydrodithiino[5,6-f]benzotrithiole 5-Oxide and Its Disproportionation
Authors: Kimura Takeshi , Ito Shinya , Sasaki Takashi , Niizuma Shigeya , Ogawa Satoshi , Sato Ryu , Kawai Yasushi
Published: September 2002

A dithia dication was generated from 4,9-diethyl[1,4]-dihydrodithiino[5,6-f]benzotrithiole 5-oxide on treatment with D2SO4. Hydrolysis of the dication gave 4,9-diethyl[1,4]dihydrodithiino[5,6-f]benzotrithiole 1-oxide and 2-oxide, suggesting that the positive charges, generated on the dithiin ring, transferred to the trithiole ring. A disproportionation of the dithia dication was observed in the solution.
Hydrothermal Synthesis and Structure of a Neutral Open-Framework Zincophosphate
Authors: Zhao Yongnan , Yao Youwei , Li Xiuhong , Chen Xiangming , Li Ming , Mai Zhenhong
Published: September 2002

A neutral open-framework zincophosphate has been hydrothermally synthesized; structure refinement shows that it is composed of Zn4O12 tetramers and infinite Zn–O–Zn chains that are linked by PO4 groups forming one-dimensional 16-membered ring channels along b direction.
Chemical Synthesis of Optically Active Polyaniline in the Presence of Dextran Sulfate as Molecular Template
Authors: Yuan Guo-Li , Kuramoto Noriyuki
Published: September 2002

One preferred handed helical structure was induced into the polyaniline main chains by chemical polymerization of achiral aniline in the presence of dextran sulfate as a molecular template, and this affords a novel chemical route for synthesis of chiral conducting polymers.
Methanol Mediated Extraction of Phenolic Compounds from Wood Tar
Authors: Minowa Tomoaki , Sato Shinya , Matsumura Akimitsu , Inoue Seiichi , Hanaoka Toshiaki , Saito Ikuo
Published: September 2002

The methanol-mediated extraction was applied to wood carbonization tar. Phenolic compounds could be extracted from the wood tar. This shows the possibility of the selective extraction of phenolic compounds, although wood tar consists of many kinds of oxygen-containing compounds such as alcohols, phenols, ketones, esters, ethers, aldehydes, carboxylic acids, furans, and so on. The extraction is expected as a new method for the utilization of wood tar.
Metal Ion-induced Chirality and Morphology Control of Self-assembling Organogels from L-Glutamic Acid-derived Lipids
Authors: Takafuji Makoto , Sakurai Toshihiko , Yamada Taisuke , Hashimoto Toshitaka , Kido Naoyuki , Sagawa Takashi , Hachisako Hiroshi , Ihara Hirotaka
Published: September 2002

L-Glutamic acid-derived lipid with an isoquinolinyl head group formed nanofibrous aggregates based on highly-ordered structures in organic media. CD spectra and TEM observations indicated that the aggregation morphology and the chirality can be controlled by complexation with metal ions.
Preparation of Pt Nanoparticles Assembled in Multilayer Films
Authors: Shen Yan , Liu Jianyun , Wu Aiguo , Jiang Junguang , Bi Lihua , Liu Baifeng , Li Zhuang , Dong Shaojun
Published: September 2002

PtCl62- anions were assembled on a glassy carbon electrode with [tetrakis(N-methylpyridyl)porphyrinato]cobalt cations through layer-by-layer method, then electrochemically reduced to yield zero valent Pt nanoparticles. Regular growth and surface morphology of the multilayer films were characterized by UV/vis, XPS and AFM.
Fabrication and Characterization of Ordered Oligoaniline Film
Authors: Chen Xu , Liu Shaoqin , Song Yonghai , Dong Shaojun
Published: September 2002

A highly organized phenyl-capped teraniline (PC-teraniline) film at the molecular level was fabricated on carbon surfaces by electrochemical reduction of diazonium salts. Cyclic voltammetry (CV), scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) were employed for the characterization of the film.
Synthesis and Characterization of Pyramidal CdSe Nanoparticles
Authors: Chen Yi , Gao Lian
Published: September 2002

We synthesized pyramidal CdSe nanoparticles by using CdCl2 as the cadmium precursor. TEM and HRTEM image showed that the nanoparticles are aggregations of many small nanocrystals.
Effect of Cyclen on the Prolongation of M Intermediate Lifetime in the D96N Mutant of Bacteriorhodopsin
Authors: Liang Bing , Li Baofang , Zhang Jianping , Jiang Long
Published: September 2002

A new kind of chemical additive—cyclen (1,4,7,10-tetra-azacyclododecane) was used in BRD96N-PVA films in an attempt to obtain longer M state lifetime. At the highest cyclen concentration of 1:250, the lifetime of M state could be prolonged to 936 s. Comparing the lifetimes of the M state in BRD96N suspension and BRD96N-PVA film with the same cyclen content, it is the strong complexing properties of cyclen towards H+ that plays the most important role in this prolongation.
Highly α-Selective Glycosylation with Glycopyranosyl Fluorides Having Diethylthiocarbamoyl Group
Authors: Mukaiyama Teruaki , Suenaga Masahiro , Chiba Hiroyuki , Jona Hideki
Published: September 2002

Highly α-selective glycosylation of various glycosyl acceptors with glucopyranosyl fluoride having diethylthiocarbamoyl group at 6-position or galactopyranosyl fluoride having the same group at 4-position proceeded smoothly in the presence of a catalytic amount of protic acid to afford the corresponding disaccharides in high yields.
Crystal Growth of Na5[B2P3O13]
Authors: Li Zhihua , Wu Yicheng , Fu Peizhen , Pan Shilie , Wang Guofu , Chen Chuangtian
Published: September 2002

Large crystals of Na5[B2P3O13] with dimensions of 22×24×17 mm3 and 35×15×5 mm3 have been grown by the Kyropouls and Czochralski methods respectively for the first time. Parameters of crystal growth including the seed direction, cooling rate and rotation rate were investigated. The measured transmittance spectrum from 180 nm to 2800 nm indicates that the absorption edge lies at 186 nm. Furthermore, Na5[B2P3O13] crystal exhibits an optical second harmonic generation effect about the same as that of KDP(KH2PO4).
Formation and Detection of Large Neutral Clusters from Liquid Beam Surface by IR Laser Irradiation
Authors: Kohno Jun-ya , Mafuné Fumitaka , Kondow Tamotsu
Published: September 2002

A continuous liquid flow of water in a vacuum (a liquid beam) was irradiated with an IR laser at 2.96 μm which is resonant to a vibration mode of liquid water related to the OH stretching vibration of H2O. Large neutral water clusters, (H2O)n, were detected directly by a Daly-type detector without ionization. The velocity distribution determined from the flight-time distribution was found to be composed of fast and slow components, which are attributed to the water clusters ejected from the outermost region of the liquid surface and from the inside of the liquid, respectively.