bluuebunny/crossref_metadata_2025 huggingface dataset:
Lipase-Catalyzed Enantioselective Acylation in the Ionic Liquid Solvent System: Reaction of Enzyme Anchored to the Solvent
Authors: Itoh Toshiyuki , Akasaki Eri , Kudo Kazutoshi , Shirakami Shohei
Published: September 2002

The lipase-catalyzed enantioselective acylation of allylic alcohols in an ionic liquid solvent was demonstrated; the reaction was significantly dependent on the counter anion of the imidazolium salt and good results were obtained when the reaction was carried out in [bmim]PF6 or [bmim]BF4 as solvent. We also first demonstrated that it was possible to repeatedly use the enzyme in the ionic liquid solvent system.
A Novel Method of CCl4 Disposal by Disproportionation with CH4 over Pt on Various Supports
Authors: Bae Jong Wook , Lee Jae Sung , Lee Kyung Hee , Lee Byeongno , Yang Duck Joo
Published: September 2002

In disproportionation of CCl4 with CH4 into CH3Cl and CHCl3, platinum supported on SrCO3, SiO2, MgO and MgAl2O4 showed stable activity and high selectivities around 700 K, providing a novel disposal method of ozone-depleting CCl4.
Structure Analysis of a Sodium Paradodecatungstate
Authors: Ozeki Tomoji
Published: September 2002

The crystal structure of a sodium paradodecatungstate has been analyzed using high-energy X-rays at the Spring-8 BL02B1 beamline, aiming at an absorption free structure determination of polynuclear heavy metal compounds. Effect of the use of high-energy synchrotron radiation has been demonstrated and the result was of sufficient quality.
Nitrous Oxide Oxidation of Olefins Catalyzed by Ruthenium Porphyrin Complexes
Authors: Yamada Tohru , Hashimoto Kentaro , Kitaichi Yasunori , Suzuki Kyosuke , Ikeno Taketo
Published: September 2002

In the presence of a catalytic amount of dioxo(tetramesitylporphyrinato)ruthenium(VI) complex, nitrous oxide (N2O) oxidized trisubstituted olefins into the corresponding epoxides in good-to-high yields with high selectivities.
Geminal Bond Participation in the Electrocyclic Reactions: Torquoselectivities of Silyl and Trimethylsilyl Derivatives of Cyclobutene, Iminocyclobutene, and Cyclobutenone
Authors: Ikeda Hirotaka , Kato Takayuki , Inagaki Satoshi
Published: September 2002

Analysis of the bond interactions at the transition state of the electrocyclic reaction of cyclobutene shows significant participation of the inward- and outward-rotating σ bonds geminal to the reacting centers. Electron-donating capabilities of the inward-rotating σ bonds are predicted to accelerate the reactions. The prediction of the torquoselectivities is confirmed by calculated preference of the inward rotations of the silyl and trimethylsilyl groups in cyclobutene, iminocyclobutene, and cyclobutenone.
Macrocyclic Saccharide Bundles as a New Type of Firm DNA Binders
Authors: Hayashida Osamu , Matsuo Aki , Aoyama Yasuhiro
Published: September 2002

Double helical DNAs such as plasmid DNA pBR322 and calf thymus (CT) DNA were firmly bound to calix[4]resorcarene-based saccharide bundles, as demonstrated by the electrophoretic, circular dichroism (CD) spectroscopic, dynamic light scattering, and thermal-stability criteria. The long-chain cluster compound interacts with DNAs more effectively than a shorter one.
Solid Phase Synthesis of Pyridazine Derivatives Using Polymer-Bound Sodium Benzenesulfinate
Authors: Chen Yu , Lam Yulin , Lee Soo-Ying
Published: September 2002

A new solid phase synthesis of 3,6-disubstituted pyridazine derivatives, resulting from the reaction of polymer-bound sodium benzenesulfinate with α-bromoketone substrates followed by condensation with hydrazine, is described. Mild basic conditions for the condensation reaction simultaneously release the desired product from the solid support. The crystal structure of 3,6-bis(p-chlorophenyl)pyridazine is reported.
A Luminescent Samarium Complex in Ring Microstructure in LB Films
Authors: Zhang R J , Yang K Z , Li J B , Hu J F
Published: September 2002

Sm(TTA)3Phen domains in a ring pattern were assembled by the Langmuir–Blodgett (LB) film technique. The domain pattern was observed by Brewster angle microscopy (BAM) at air/liquid interface and by atomic force microscopy (AFM) on mica. Under the electrostatic forces, Sm(TTA)3Phen molecules move towards and nucleate at the edge of the stearic acid (SA) domains exhibiting gradient electric field, resulting in the formation of ring domains of the samarium complex.
Remarkable Effect of Iron-Substitution for Molybdenum in Phosphododecamolybdate on Oxidative Dehydrogenation of 2-Propanol
Authors: Min Joon-Seok , Misono Makoto , Taguchi Akira , Mizuno Noritaka
Published: September 2002

Cesium hydrogen salt of mono-iron-substituted phosphoundecamolybdate, Cs2.8H1.2Pmo11FeO39, was synthesized and the catalyst showed intrinsically higher selectivity to acetone for the title reaction compared with the iron-impregnated Fe3+(1.2–5.0 wt%)/Cs3.0Pmo12O40.
Determination of Rh–C Bond Dissociation Energy in Methyl(porphyrinato)rhodium(III) Complexes: a New Application of Photoacoustic Calorimetry
Authors: Li Gang , Zhang Fei Fei , Pi Na , Chen Hui Lan , Zhang Shu Yi , Chan Kin Shing
Published: September 2002

The photolysis of RhCH3(ttp) and RhCH3(tmp) (ttp = 5,10,15,20-tetratolylporphyrin, tmp = 5,10,15,20-tetramesitylporphyrin) was studied in methanol at ambient temperature: the quantum yields for photolysis were determined to be 0.51 and 0.54, respectively, and the Rh–C bond dissociation energies (227 and 219 kJ mol−1, respectively) were measured by photoacoustic calorimetry, which were larger than those of Co–C bond.
Palladium-Catalyzed Cross-Coupling Polycondensation of Bisalkynes with Dihaloarenes Activated by Tetrabutylammonium Hydroxide or Silver(I) Oxide
Authors: Mori Atsunori , Kondo Tatsuhiro , Kato Tsuyoshi , Nishihara Yasushi
Published: September 2002

The palladium(0)-catalyzed polycondensation of bis-trimethylsilylethynylated compounds with diiodoarenes to give the polymers bearing arylene-ethynylene moieties is carried out by the use of silver(I) oxide as an activator. Polycondensation of bifunctional terminal alkynes and aryl halides is also accomplished by the palladium-catalyzed cross coupling in the presence of tetrabutylammonium hydroxide (TBAOH), tetrabutylammonium fluoride (TBAF), or silver(I) oxide.
A Novel Technology for Chemical Recycling of Low-Density Polyethylene by Selective Degradation into Lower Olefins Using H-Borosilicate as a Catalyst
Authors: Takuma Kazuhiko , Uemichi Yoshio , Sugioka Masatoshi , Ayame Akimi
Published: September 2002

Catalytic degradation of low-density polyethylene to lower olefins over H-borosilicate has been proposed as a novel technology for chemical recycling of polyolefins.
A Convenient and Useful Method of Preparation of α-Bromo Enones from the Corresponding Enones Using Organic Ammonium Tribromide (OATB)
Authors: Bose Gopal , Barua Pankaj M Bujar , Chaudhuri Mihir K , Kalita Dipak , Khan Abu T
Published: September 2002

Various acyclic α-bromo enones 2 as well as cyclic α-bromo enones 4 can be prepared from the corresponding acyclic enones 1 and cyclic enones 3 respectively, in a one-pot procedure by employing organic ammonium tribromide, such as cetyltrimethylammonium tribromide (CetTMATB) or tetrabutylammonium tribromide (TBATB) in presence of K2CO3 in dichloromethane at 0 °C to room temperature under very mild conditions in good yields.2
Temperature and Density Dependences of the Dynamics of Liquid n-Pentane Studied by Molecular Dynamics Simulation
Authors: Hirata Yoshinori
Published: September 2002

In order to elucidate the temperature and density dependences of the power spectra of the velocity autocorrelation functions, molecular dynamics simulation of liquid n-pentane has been carried out. Strong temperature dependence is observed in the frequencies lower than ∼20 cm−1, while the variation of the density makes significant effect in the whole spectral region where low-frequency phonon modes of liquids are expected to appear.
Nitrogen Absorption and Desorption Characteristics for CeFe7
Authors: Itoh Masahiro , Machida Ken-ichi , Hirose Kazuhiro , Adachi Gin-ya
Published: September 2002

Reversible nitrogen absorption and desorption cycle of CeFe7 and Ce2Fe17 was performed by heating in NH3 or N2 for nitrogenation and in H2 for denitrogenation. The nitrogen absorption and desorption rates for CeFe7 were faster than that for Ce2Fe17 owing to the high diffusion rate of nitrogen for CeFe7, resulting that the nitrogen absorption and desorption property of CeFe7 was superior to that of Ce2Fe17.
{B[C2H4Si(CH3)NH]2[C2H4Si(CH3)N(SiH2Ph)]}n: The First Polyborosilazane Precursor for Silicoboron Carbonitride Stable to 2200 °C
Authors: Wang Zhi-Chang , Gerstel Peter , Kaiser Gerhard , Kummer Horst , Bill Joachim , Aldinger Fritz , Riedel Ralf
Published: September 2002

{B[C2H4Si(CH3)NH]2[C2H4Si(CH3)N(SiH2Ph)]}n was synthesized by base-catalyzed dehydrocoupling reaction of {B[C2H4Si(CH3)NH]3}n with phenylsilane. Pyrolysis of the new polyborosilazane precursor to 1050 °C gave an amorphous material Si3.9B1.0C11N3.2, which could resist thermal degradation to 2200 °C in argon.
Surface Modification for Sm2Fe17Nx Fine Powders by Self-Assembled Monolayers Derived from Hydridosilane
Authors: Noguchi Kenji , Hamaguchi Yu , Machida Ken-ichi , Adachi Gin-ya
Published: September 2002

Surface of fine powder of Sm2Fe17Nx was modified with self-assembled monolayer (SAM) film derived from hydridosilane. The oxidation resistance of Sm2Fe17Nx bonded magnet was effectively improved by good hydrophobic property of the resulting SAM film.
A Substrate-Specific α-Hydoxylation of Dipeptides Mediated upon a Co(III)-terpyridine Complex: A Functional Model for Peptidylglycine α-Hydroxylating Monooxygenase
Authors: Jitsukawa Koichiro , Irisa Tsuyoshi , Einaga Hisahiko , Masuda Hideki
Published: September 2002

A substrate-specific α-hydroxylation of dipeptides has been found out as a functional model for peptidylglycine α-hydroxylating monooxygenase (PHM), in the reaction of the Co(III) ternary complexes containing terpyridine and dipeptide ligands under aerobic and slightly alkaline conditions.
Acetonitrile Accelerated Stereoselective C–H Bond Activation of the Cationic Ir(I) Complex Having the PN/CH3 Heterochelate Hybrid Ligand
Authors: Kataoka Yasutaka , Shizuma Kazuko , Yamagata Tsuneaki , Tani Kazuhide
Published: September 2002

The cationic iridium(I) complex having a heterochelate ligand, [Ir(cod)(PN/CH3)]PF6 {PN/CH3 = o-Ph2PC6H4CH(CH3)OCH2(C5H4N-2)} (3) was prepared and characterized. Complex 3 underwent stereoselective facile activation of the benzylic C–H bond in CH3CN at 50 °C to produce the oxidative addition product, a hydrido alkyl complex fac-4 after displacement of COD by 2 molecules of CH3CN. The initially generated fac-4 isomerized gradually to give the geometrical isomer selectively mer-4 in CH3CN.
Retention Selectivity between 4-(2-Pyridylazo)resorcinol and Its Cobalt Chelate in the Solid Phase Extraction Systems and Its Application to the On-Line Preconcentration for Reversed Phase HPLC
Authors: Tsuyoshi Akira , Hoshino Hitoshi , Yotsuyanagi Takao
Published: September 2002

Preferential solid phase extraction of ultratrace metal chelate from the excess of its ligand has been succeeded in the case of cobalt, 4-(2-pyridylazo)resorcinol (PAR), ODS-Silica, and H2O system, applying the reverse order of them found in reversed-phase HPLC with aqueous methanol and ODS-SiO2. This finding makes it possible to concentrate the 1-ppt level of cobalt chelate in the presence of excess PAR from aqueous samples using kinetically selective HPLC.
Influence of the Adsorbate and the Crystal Structure on the Photoluminescence Property of TiO2 Powder in Air with Ethanol Vapor at Room Temperature
Authors: Nakajima Hiromitsu , Itoh Kiminori , Murabayashi Masayuki
Published: September 2002

The influence of crystal structure and photocatalytic (PC) reaction on photoluminescence (PL) of several TiO2 powders has been studied at room temperature. The PL intensity of the rutile TiO2 powders increased significantly in proportion to t1/2 by adding ethanol vapor, while those of the anatase TiO2 powders increased slowly. This observation can be explained based on the difference in their PC activities.
The [4+2]Cycloaddition of 2,3-Dimethylbutadiene to the Diselenido Ligand in the Dicationic Dinuclear Ruthenium Complexes
Authors: Sugiyama Hiroyasu , Watanabe Toshifumi , Matsumoto Kazuko
Published: September 2002

The dicationic diselenido-bridged dinuclear ruthenium complexes, [{Ru(P(OCH3)3)2(RCN)}2(µ-Se2)(µ-Cl)2]2+ (2: R = CH3, 3: R = C6H5) were prepared by the reactions of [{Ru- (P(OCH3)3)2Cl}2(µ-Se2)(µ-Cl)2] (1) with 2 equiv of Ag(I) salt under the presence of corresponding nitrile. Complexes 2 and 3 were trapped by 2,3-dimethylbutadiene to give [{Ru(P(OCH3)3)2-(RCN)}2{µ-SeCH2C(CH3)=C(CH3)CH2Se}(µ-Cl)2]2+ (4: R = CH3, 5: R = C6H5) carrying a C4Se2 six–membered ring.
Production of N-Acetyl-D-glucosamine from β-Chitin by Enzymatic Hydrolysis
Authors: Sashiwa Hitoshi , Fujishima Shizu , Yamano Naoko , Kawasaki Norioki , Nakayama Atsuyoshi , Muraki Einosuke , Aiba Sei-ichi
Published: September 2002

N-Acetyl-D-glucosamine, which is a focusing material for the improvement of osteoarthritis, was obtained from β-chitin by enzymatic hydrolysis in high yield (76%).
Highly Sensitive Optical Oxygen Sensing Material: Thin Silica Xerogel Doped with Tris(4,7-diphenyl-1,10-phenanthroline)ruthenium
Authors: Lee Sang-Kyung , Shin Yong Beom , Pyo Hyeon-Bong , Park Seon Hee
Published: September 2002

A highly sensitive optical sensor based on the luminescence quenching of tris(4,7-diphenyl-1,10-phenanthroline)ruthenium (II) complex (Rudpp) immobilized in a sol–gel-based thin silca xerogel was fabricated. Sensor material was prepared by entrapping it in chemically inert silica using the sol–gel process. The sensor showed good linearity from the modified Stern–Volmer plot. The dynamic response result demonstrated the fast response time of the sensor, less than 10 s. Largely enhanced photostability of the material was also one of the sensor’s most promising properties.
Visible Light-Induced Reversible Photomagnetism in Copper(II) Octacyanomolybdate(IV)
Authors: Ohkoshi Shin-ichi , Machida Naoko , Abe Yukinori , Zhong Zhuang J , Hashimoto Kazuhito
Published: September 2002

We report a visible light-induced reversible photomagnetism in CuII2[MoIV(CN)8]·8H2O (1). By the irradiation with a 480-nm laser light, the compound 1 showed a spontaneous magnetization with a magnetic ordering temperature (Tc) of 30 K. Conversely, the magnetization and Tc values were reduced by the irradiation with a 600-nm laser light. This photomagnetism is due to the reversible photo-induced electron transfer between paramagnetic 1 and its valence isomer exhibiting ferromagnetism.
The Synthesis of Optically Pure Enantiomers of N-Acyl-homoserine Lactone Autoinducers and Their Analogues
Authors: Ikeda Tsukasa , Kajiyama Koshiro , Kita Toshikazu , Takiguchi Noboru , Kuroda Akio , Kato Junichi , Ohtake Hisao
Published: September 2002

Optically pure enantiomers of N-acyl-homoserine lactones and thiolactones, whose optical purities were unambiguously determined by chiral stationary phase HPLC analyses, were firstly synthesized. Bioassays revealed that l-isomers were essential as the autoinducers in quorum sensing, while no effect was observed with d-isomers.
Structure and Magnetic Property of a Macrocyclic Tetranuclear Copper(II) Complex with Phenoxo- and Hydroxo-Bridges and Large and Small Cu–O–Cu Angles
Authors: Handa Makoto , Takemoto Toshikazu , Thompson Laurence K , Mikuriya Masahiro , Nagao Nobuyuki , Ikemi Shinichiro , Lim Jong-Wan , Sugimori Tamotsu , Hiromitsu Ichiro , Kasuga Kuninobu
Published: September 2002

Reaction of a macrocyclic ligand of 36-membered octaamino-tetraphenol with copper(II) triflate gave a tetranuclear complex with a large Cu–O(phenoxo)–Cu angle (130.8(1)°) and small Cu–O(phenoxo)–Cu (91.5(1)°) and Cu–O(hydroxo)–Cu angles (93.1(1)°). The magnetic behavior was interpreted based on the structural data.
Microscale Absorption Procedure for Simple and Rapid Gas–Liquid Extraction and Its Application to the Determination of Nitrogen Dioxide in the Atmosphere Coupled with Microflow Injection Analysis
Authors: Ma Lan , Oshima Mitsuko , Motomizu Shoji
Published: September 2002

A simple and miniaturized flow-through gas absorbing unit (GAU) using a small volume of an absorbing solution (0.5 mL) was developed and applied to the determination of nitrogen dioxide (NO2) in the atmosphere. The measuring method was coupled with a microflow injection analysis system (µFIA) for a small sample size consumption. The absorption efficiency of NO2 in the GAU was improved by packing hydrophobic poly(tetrafluoroethylene) (PTFE) particles in the unit, and by using a triethanolamine aqueous solution (TEA, 2 g/L) as an absorbing solution: absorption efficiency was increased up to more than 95%. The absorbed NO2 was converted to NO3− and NO2−. The molar ratio was ascertained to be 1:1 by measuring the concentrations of NO2− and NO3− in the absorbing solution using µFIA. Nitrogen dioxide at concentrations above 10 ppb in the atmosphere could be determined by the proposed method.
Magnetic Phase Transition between Ferromagnetic High-Temperature Phase and Antiferromagnetic Low-Temperature Phase in 5-Carboxy-2-thienyl Nitronyl Nitroxide
Authors: Sugano Tadashi
Published: September 2002

From the measurements of the temperature dependence of magnetization, a magnetic phase transition at 145 K with a thermal hysteresis is found for an organic radical 5-carboxy-2-thienyl nitronyl nitroxide. Ferromagnetic intermolecular interaction is observed in the high-temperature phase while antiferromagnetic interaction is obtained for the low-temperature phase.
Efficient Red Electroluminescence from New Europium Complex
Authors: Noto Mitsuharu , Irie Kazutaka , Era Masanao
Published: September 2002

Efficient red electroluminescence (EL) was performed in the organic electroluminescent device using emissive layer of a new Eu complex, which has 2,4-dioxopentanedinitrile (1,3-dicyano-1,3-propanedione, DCNP), 1,3-diphenyl-1,3-propanedione (dibenzoylmethane, DBM) and 1,10-phenanthroline (phen) (1:2:1) as ligands, doped into 2-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole (PBD) host; luminance, external quantum efficiency and power efficiency of the EL were 10 cd m−2, 3.5% and 2.0 lm W−1 at a current density of 0.17 mA cm−2, and 84 cd m−2, 1.6% and 0.69 lm W−1 at 2.9 mA cm−2.
Conversion of Dimethyl Ether to Diesel Fuel Additives via Dielectric Barrier Discharges
Authors: Jiang Tao , Liu Chang-jun , Fan Guo-liang
Published: September 2002

A high-efficient conversion of dimethyl ether (DME) to diesel fuel additives at ambient condition via dielectric-barrier discharges has been performed. The conversion of DME reaches a high value of 66.56% at a gas flow rate of 30 mL·min−1. The liquid obtained is a cetane number promoter of diesel fuels. The selectivity of liquid product is more than 40%.
Efficient and Homochiral Selective Oligomerization of Racemic Ribonucleotides on Mineral Surface
Authors: Urata Hidehito , Aono Chie , Ohmoto Norihiko , Shimamoto Yuko , Kobayashi Yoshiko , Akagi Masao
Published: September 2002

We have found that activated racemic mononucleotides oligomerize with comparable efficiency to chiral d-monomers on Na+-montmorillonite, and that the reaction proceeds in a homochiral selective manner to preferentially give optically homogeneous d- and l-oligomers. Mineral surfaces might play important roles in an early stage of chemical evolution of RNAs.
Template Synthesis and Characterization of ZnxCd1−xS Nanorod
Authors: Meng Zhaoyu , Peng Yiya , Chen Xinyu , Qian Yitai
Published: September 2002

ZnxCd1−xS nanorods were hydrothermally synthesized by a template reaction of CdS nanorods with ZnCl2·H2O and thiourea at 180 °C. Through changing the molar ratio of Zn to Cd in the reactants, ZnxCd1−xS nanorods (0<x<0.55) were obtained. XRD, ICP-AES, TEM and UV–vis were used to characterize the samples.
Surface Second Order Optical Nonlinearity of Titanium Dioxide Sized in Nanometer Range
Authors: Fu De-gang , Zhang Yu , Wang Xin , Liu Ju-zheng , Lu Zu-hong
Published: September 2002

The nanoparticles of a centrosymmetric material titanium dioxide (TiO2) have been synthesied and characterized by hyper-Rayleigh scattering (HRS) technique. The particles with mean diameter of 10 nm have large first order hyperpolarizability in solution, which arise from the surface layer of the particles.
The Effect of Molecular Structure on Liquid Crystal Properties in Binary Mixtures
Authors: Wu Jianwei , Okamoto Hiroaki , Takenaka Shunsuke
Published: September 2002

The mesomorphic properties of some binary mixtures consisting of 4-alkoxyphenyl 4-(2-R- or 4-R-3-alkoxybenzoyloxy)benzoates (R=H, CH3, Br, or CN) and 4-cyano-4′-octyloxybiphenyl or 4-pentyloxyphenyl 4-[(4-octyloxy)benzoyloxy]benzoate were examined. In the binary phase diagrams an enhanced and/or induced smectic A phases were observed, even if both components have terminal polar group. The mesomorphic properties are discussed in terms of both electrostatic nature of substituents and molecular shapes of both components.
Design and Gas Adsorption Property of a Three-Dimensional Coordination Polymer with a Stable and Highly Porous Framwork
Authors: Seki Kenji , Takamizawa Satoshi , Mori Wasuke
Published: September 2002

A three-dimensional coordination polymer was synthesized from porous copper(II) terephathlate and triethylenediamine (TED) as a pillar ligand, which has a higher porosity and higher capacity for methane adsorption than zeolites and porous coordination polymers reported previously.
Enhanced Photocatalytic Dechlorination of 1,2,3,4-Tetrachlorobenzene Using Nanosized CdS/TiO2 Hybrid Photocatalyst under Visible Light Irradiation
Authors: Yin Hengbo , Wada Yuji , Kitamura Takayuki , Sakata Takao , Mori Hirotaro , Yanagida Shozo
Published: September 2002

The photocatalytic activity of CdS nanocrystallites (n-CdS) supported by TiO2 (P-25) nanocrystallites was higher for reductive dechlorination of 1,2,3,4-tetrachlorobenzene than that of n-CdS alone under visible light irradiation. This synergistic effect of TiO2 could be explained as being due to the adsorptive interaction of triethylamine (TEA) at the CdS/TiO2 interface, which contributed to the effective quenching of the holes formed in n-CdS by TEA.
On the Delicate Influence of a Minute Amount of Water on the Organogel Stability Comprised of a Sugar-Integrated Gelator
Authors: Tamaru Shun-ichi , Luboradzki Roman , Shinkai Seiji
Published: September 2002

It was found that the stability of organogel of methyl-4, 6-O-benzylidene-α-d-glucopyranoside (1) is sensitively affected by a minute amount of concomitant water: the maximum stability is observed at [H2O]/[1] = 1.0. The effect of water molecules on the organogel stability is well understood in relation to its crystal structures. Thus, this paper has provided an important admonition for the stability of hydrogen-bond-dependent organogels.
Synthesis and Structure of Azobenzenes Bearing Silyl, Germyl, and Stannyl Groups at 2-Position
Authors: Kano Naokazu , Komatsu Fuminori , Kawashima Takayuki
Published: September 2002

Azobenzenes, 2-R12R2MC6H4N=NPh (M = Si (1a–c), Ge (7), and Sn (8)), were synthesized by reactions of 2-lithioazobenzene (6) with the corresponding chloro compounds, R12R2MCl, respectively, in good to moderate yields. The crystal structure of 1c was established by the X-ray crystallographic analysis.
Methane-Steam Reforming over Ni/Al2O3 Catalyst Prepared Using W/O Microemulsion
Authors: Hayashi Hiroki , Murata Seiichiro , Tago Teruoki , Kishida Masahiro , Wakabayashi Katsuhiko
Published: September 2002

The catalytic activity and durability of methane-steam reforming under a low H2O/CH4 molar ratio was studied on an Ni/Al2O3 catalyst prepared using water-in-oil (w/o) microemulsion. The initial activity of the prepared Ni/Al2O3 catalyst was higher than that of an impregnated one. The impregnated catalyst deactivated rapidly and lost its activity at a time-on-stream of 15 h due to severe coking (> 30 wt%-carbon after 20 h). In contrast, the catalyst prepared using w/o microemulsion sustained its activity for 40 h, and gave little coke (<0.3 wt%-carbon after 40 h) on the catalyst.
Extended Silapericyclynes
Authors: Unno Masafumi , Negishi Keisuke , Matsumoto Hideyuki
Published: September 2002

The synthesis of medium to large-membered cyclic silicon-butadiyne compounds (‘extended silapericyclynes’) was accomplished by the reaction of dilithiobutadiyne with dichlorodiisopropylsilane. The cyclic tetramer, pentamer, hexamer, and heptamer were obtained in 8%, 5%, 4%, and 2% yields, respectively. The structure of the tetramer was determined, and column-like packing was observed. The UV spectra of all compounds are also shown.
Isolation and Single X-ray Crystal Structure of a Flattened M3L2 Type Metallosupramolecular Cage Obtained by Self-Assembly of Tripodal Ligand with Zinc(II) Chloride
Authors: Sun Wei-Yin , Xie Jin , Yu Kai-Bei
Published: September 2002

A novel cake-like complex, Zn3(tbib)2Cl6·3DMF·2H2O [tbib = 1,3,5-tris(benzimidazol-2-ylmethyl)benzene], was synthesized by self-assembly of tripodal ligand tbib with zinc(II) chloride. The X-ray crystal structural analysis indicates that the framework is a flattened M3L2 type cage-like complex in which the tbib ligand has a cis, trans, trans conformation.
Sonochemical Synthesis and Phase Control of Nanocrystalline CdS
Authors: Wang Guozhong , Li Guanghai , Liang Changhao , Zhang Lide
Published: September 2002

Sonochemical reaction has been successfully used to prepare CdS nanocrystalline with either hexagonal or cubic phase structure at room temperature. It was found that the solvent has a great influence on the phase structure. The product was characterized by X-ray diffraction and transmission electron microscope. The possible mechanisms for the formation of CdS nanocrystalline in different solvents are proposed.
Formation and Cleavage of a Dicobalt Complex Bridged with a Pentamethylene Group
Authors: Shimakoshi Hisashi , Koga Masaomi , Hayashi Takashi , Tachi Yoshimitsu , Naruta Yoshinori , Hisaeda Yoshio
Published: September 2002

A new dicobalt complex bridged with a pentamethylene group was prepared and characterized by electronic and ESI mass spectroscopies. This cobalt complex gives cyclopentane via radical intermediates by anaerobic photolysis.
Synthesis of Self-Complementary Betainic Guanine Model Compounds
Authors: Schmidt Andreas , Kindermann Markus Karl
Published: September 2002

Reaction of 4-(dimethylamino)pyridine and 1-methylimid-azole, respectively, on 2-amino-4-chloro-6-hydroxypyrimidine resulted in the formation of pyrimidine-heteroarenium salts. These could be deprotonated using anion exchange resin to yield pyridinium-pyrimidinolates as model compounds for biologically highly important betainic guanines present in RNA. As proved by ESIMS, these cross-conjugated mesomeric betaines are self-complementary and form homo-intermolecular dimers.
A Novel One-Dimensional Chain Cyano-Bridged Complex [Sm(DMF)4(H2O)2Mn(CN)6·H2O]n: Long-Range Magnetic Ordering, Tc = 18 K and Coercive Force Hc = 600 Oe
Authors: Yan Bing , Chen Zhida , Wang Shixi , Gao Song
Published: September 2002

A novel cyano-bridged heteronuclear complex [Sm(DMF)4(H2O)2Mn(CN)6·H2O]n has been synthesized based on the reaction of K3Mn(CN)6, Sm(NO3)3·6H2O and N,N-dimethylformamide (DMF). The crystal structure shows that title complex is a one-dimensional chain complex with two cis-CN bridging ligands between Sm atom and Mn atom. The measurement of magnetic property evidences an antiferromagnetic interaction between Sm and Mn atom. It is very interesting that title complex exhibits unusual magnetic properties, such as long-range magnetic ordering, critical temperature Tc = 18 K and stronger coercive force Hc = 600 Oe.
Growth of a New Nonlinear Optical Crystal Ba2Be2B2O7 by TSSG Method
Authors: Qi Hua , Chen Chuangtian
Published: September 2002

In this work, a new nonlinear optical Ba2Be2B2O7 crystal was grown by top-seeded solution growth method using BaB2O4–BaCO3–NaF fluxes. The differential thermal analysis curve and a typical angle-tuned curve of Ba2Be2B2O7 crystal were also investigated. The measured ultraviolet absorption edge of the title crystal was found to be about 215 nm.
Drastic Photoluminescence Quenching of Perylene Derivative Membrane with Phthalocyanine Coating
Authors: Nagai Keiji , Fujimoto Yasushi , Shiroishi Hidenobu , Kaneko Masao , Norimatsu Takayoshi , Yamanaka Tatsuhiko
Published: September 2002

The photoluminescent property of a bilayer of phthalocyanine and a perylene derivative, a part of an organic photovoltaic cell, was investigated. The monolayer of the perylene derivative exhibited photoluminescence at 824 nm with lifetimes of 1.6 ns and 0.10 ns. The steady state and time-resolved photoluminescence of the 100-nm perylene derivative layer were efficiently quenched with a 100-nm phthalocyanine coating. The high efficiency of the quenching was explained by the high mobility of the photogenerated carrier in the n-type semiconducting perylene derivative, and agreed with the insensitivity of the photovoltaic property of the bilayer to the thickness.
Formation of Ethylene-Bridged Bimetallic Zirconocene Complexes by Coupling of Cp2ZrEt2 and Cp2ZrX2 (X = Cl or Br)
Authors: Ura Yasuyuki , Jin Masayoshi , Nakajima Kiyohiko , Takahashi Tamotsu
Published: September 2002

Cp2ZrEt2 reacted with one equiv of Cp2ZrX2 (X = Cl or Br) in THF to afford ethylene-bridged bimetallic zirconocene complexes, (Cp2ZrX)2(CH2CH2) (X = Cl (2a), or Br (2b)), in high yields. The structure of 2b was determined by X-ray analysis. Reactions of 2a–b with various anions Y− gave a series of ethylene-bridged bimetallic zirconocene complexes, (Cp2ZrY)2(CH2CH2) (Y = Ph, Me, Bu, CH2SiMe3) in good to high yields.
Stabilized Self-Sustained Sequence Replication against Evolutionary Instability
Authors: Yamamoto Yuji , Komiya Shouichi , Husimi Yuzuru
Published: September 2002

When self-sustained sequence replication, which is an isothermal amplification method of DNA/RNA, was applied to in vitro evolution experiments, it often showed evolutionary instability. A method to prevent this instability was devised using a DNA oligomer of promoter sequence with modified 3'-end.
Ethylene Polymerization and Ring-Opening Metathesis Polymerization of Norbornene Catalyzed by (Arylimido)(aryloxy)vanadium(V) Complexes of the Type, V(Nar)(Oar′)X2 (X = Cl, CH2Ph)
Authors: Nomura Kotohiro , Sagara Asami , Imanishi Yukio
Published: September 2002

VCl2(N-2, 6-Me2C6H3)(O-2, 6-iPr2C6H3) - methylaluminoxane catalyst has exhibited remarkable catalytic activity for ethylene polymerization. High molecular weight ring-opened poly(norbornene) has been prepared in the presence of V(CH2Ph)2(N-2, 6-Me2C6H3)(O-2, 6-iPr2C6H3).
Electrically Induced Creeping and Bending Deformation of Plasticized Poly(vinyl chloride)
Authors: Uddin Md Zulhash , Yamaguchi Masaki , Watanabe Masashi , Shirai Hirofusa , Hirai Toshihiro
Published: September 2002

We have successfully actuated a non-ionic poly(vinyl chloride) (PVC) gel by applying a dc electric field, and found a localized creeping deformation, which induced a novel type large bending of the gel rod just like a joint in a body. The gel was composed of PVC and dioctylphthalate (DOP), and was free of electrolytes. We proposed a tentative mechanism for the reversible and remarkable deformation. It could be an advantage over conventional electroactive gels for durability and performance in practical applications as a new class of soft functional materials.
Synthesis and Structure of an Open-Framework Zinc Phosphate with Two-Dimensional Intersecting Channels
Authors: Zhao Yongnan , Shi Zhan , Chen Xiangming , Mai Zhenhong , Feng Shouhua
Published: September 2002

A three-dimensional zinc phosphate templated by diethylenetriamine is synthesized under hydrothermal conditions; structure refinement shows that it possesses two-dimensional intersecting channels.
Influence of the Process on the Mechanisms and the Performances of the Preferential Crystallization: Example with (±)-5-(4-Bromophenyl)-5-methylhydantoin
Authors: Courvoisier L , Ndzié E , Petit M-N , Hedtmann U , Sprengard U , Coquerel G
Published: September 2002

Resolution of the title compound is carried out at a two liter scale via two different processes of preferential crystallization (PC), the Auto Seeded Programmed Polythermic Preferential Crystallization (AS3PC) process and the classical Seeded Isothermal Preferential Crystallization (SIPC) process. The ratio, crystal growth rate/secondary nucleation rate, is strongly under the influence of the process. Consequently AS3PC process appears more efficient than SIPC process in terms of purity of the crops (optical purity), yield, easiness of scale up and downstream operations such as filterability.
Photochromism of Diarylethenes on Porous Aluminum Oxide: Fatigue Resistance and Redox Potentials of the Photochromes
Authors: Uchida Kingo , Fujita Masayuki , Aoi Yoshifumi , Saito Mitsunori , Irie Masahiro
Published: September 2002

The photochromism of three diarylethene derivatives was examined on porous aluminum oxide. Upon alternate irradiation with UV and visible light, the diarylethenes having thiophene rings decomposed easily, while a derivative having benzothiophene rings underwent a reversible photochromic reaction. The decomposition started from the closed-ring isomers of the dithienylethenes. The decomposition mechanism was discussed based on the oxidation potentials of the compounds.
Rapid and Complete Hydrodechlorination of 2,4-Dichlorophenoxyacetic Acid Catalyzed by Pd/TiO2 with H2 in Deionized Water
Authors: Yamanaka Ichiro , Nishikawa Koji , Otsuka Kiyoshi
Published: September 2002

Pd/TiO2 catalyzes rapid and complete hydrodechlorination of 2,4-dichlorophenoxyacetic acid dissolved in H2O with H2 to phenoxyacetic acid with a high turnover number of Pd at 303 K.
A Cyclic Sugar Unit Interacts More Strongly with DNA Than Do Open-Chain Polyol Counterparts in Sugar-Linked Synthetic DNA Intercalators
Authors: Kumasaki Atsushi , Goto Tomoko , Nakamura Shigeo , Ihara Toshihiro , Takagi Makoto
Published: September 2002

We synthesized new DNA intercalators, polyol- or cyclic sugar-linked anthraquinone derivatives. The binding affinity of these DNA intercalators is suggested to be controlled by the configuration and steric structure of sugar chain with the cyclic sugar chain interacting more strongly than the open-chain polyol unit with double stranded DNA.
Particle Crystals of Surface Modified Gold Nanoparticles Grown from Water
Authors: Kimura Keisaku , Sato Seiichi , Yao Hiroshi
Published: September 2002

Surface modified nanometer-sized gold particles with mercaptosuccinic acid (MSA) are crystallized in the size range of a few micrometer. Two dimensional superlattice was also generated in the same system. The transmission electron microscope images of these superstructures and the reflectance spectrum are reported in comparison with that of bulk sample.
Reconstruction of Au(111) Following the Reductive Desorption of Self-Assembled Monolayers of 2-Mercaptoethanesulfonic Acid Studied by in Situ Scanning Tunneling Microscopy
Authors: Hobara Daisuke , Yamamoto Masahiro , Kakiuchi Takashi
Published: September 2002

The reconstruction of Au(111) to (√3 × 23) structure after the reductive desorption of a self-assembled monolayer (SAM) composed of 2-mercaptoethanesulfonic acid (MESA) has been imaged by in situ scanning tunneling microscopy (STM) in a 0.5 mol dm−3 KOH aqueous solution. The STM images clearly show that after the reductive desorption of MESA the Au(111) surface reconstructs to the (√3 × 23) structure. The reconstruction starts from the edge, spreads gradually, and covers the entire terraces of Au(111) on the time scale of several minutes. Pits of the gold substrate are formed especially at the boundaries between the unreconstructed and the reconstructed areas during the spread of the reconstruction.
Macroporous ZnO Films Electrochemically Prepared by Templating of Opal Films
Authors: Sumida Takayuki , Wada Yuji , Kitamura Takayuki , Yanagida Shozo
Published: September 2002

Highly ordered macroporous ZnO films were electrodeposited using polystyrene colloidal crystals as templates. The films prepared at −1.0 V vs Ag/AgCl had the long-range order of pores reflecting the templates.
New Chiral NMR Shift Reagent for α-Amino Acids and N-Protected Oligopeptides in Aqueous Solution
Authors: Watanabe Masaaki , Hasegawa Takayuki , Miyake Hiroyuki , Kojima Yoshitane
Published: September 2002

A europium(III) complex with a new chiral ligand, N,N-bis[2-{N-methyl((1S)-1-carboxy-3-methyl)butylamino}ethyl]glycine, is described as a new chiral shift reagent for α-amino acids and N-acyl-oligopeptides in aqueous solutions without signal broadening on high resolution NMR spectroscopy. In addition, the molecular structure of lanthanum(III) complex with this ligand is revealed by X-ray crystallography.
Higher Order Association of Distannoxane Leading to Novel Sheet-Like Framework
Authors: Orita Akihiro , Sakamoto Katsumasa , Ikeda Hiroshi , Xiang Jiannan , Otera Junzo
Published: September 2002

Treatment of Bu2SnO (2 equiv) with triflic acid (TfOH) in dry acetone gives [(TfO)Bu2SnOSnBu2(OH)]n (1) that is proved to possess a unique sheet-like structure on the basis of X-ray crystallography.
The First Chemical Trapping of Stibinidene, a Monovalent Antimony Compound
Authors: Sasamori Takahiro , Arai Yoshimitsu , Takeda Nobuhiro , Okazaki Renji , Tokitoh Norihiro
Published: September 2002

Deselenation of a 1,3,5-triselena-2,4,6-tristibane bearing 2,4,6-tris[bis(trimethylsilyl)methyl]phenyl (denoted as Tbt) groups in the presence of 1,3-butadienes resulted in the formation of the corresponding [1 + 4]-cycloadducts of a sterically hindered stibinidene (Tbt-Sb:), a monovalent species of antimony. Thermal generation of the stibinidene from the stibolene derivatives via retro [1 + 4]-cycloaddition reaction was suggested by the diene-exchange reaction in thermolysis of the adducts in the presence of another butadiene derivative.
Promoting Effect of Water Vapor on the Catalytic Activity of Cobalt-Exchanged MFI Zeolite for the Selective Reduction of NO by C3H8
Authors: Shichi Akira , Satsuma Atsushi , Hattori Tadashi
Published: September 2002

The presence of water vapor was found to remarkably enhance the catalytic activity for selective reduction of NO by C3H8 over Co2+-exchanged MFI zeolite prepared from H-form MFI zeolite.
Hyper-Rayleigh Scattering of CdS Nanoparticles with Different Surfaces
Authors: Zhang Yu , Wang Xin , Fu Degang , Liu Juzheng , Cui Yiping , Lu Zuhong
Published: September 2002

The first-order hyperpolarizability β values of two kinds of CdS nanoparticles with different surfaces were experimentally determined in solution via an incoherent hyper-Rayleigh scattering (HRS) technique. It is found that the β value of CdS nanoparticles capped with 2, 2′-bipyridine is 4.27 × 10−27 esu which is about a factor of 3 smaller than the β value (1.30 × 10−26 esu) of bare CdS nanoparticles whose surface is not modified by organic groups. This difference is interpreted in terms of a two-level model approximation derived from molecular chromophores, when considering the contribution of molecule-like scatterers at the particle surfaces.
A New OsO4-Mediated Carbon–Carbon Bond Cleavage Reaction Leading to the Formation of Anthraquinone
Authors: Gao Shouhai , Wang Wei , Wang Binghe
Published: September 2002

A new OsO4-mediated carbon–carbon bond cleavage reaction leading to the formation of anthraquinone was observed. The reaction goes through the dihydroxylated intermediate and is aided by the presence of pyridine.
Design and Construction of Coordination Polymers Based on the Topological Property of the Multidentate Ligand
Authors: Adachi Keiichi , Kawata Satoshi , Kabir Md Khayrul , Kumagai Hitoshi , Inoue Katsuya , Kitagawa Susumu
Published: September 2002

The crystal structures and magnetic properties of two-dimensional coordination polymers [M(tdpd)(H2O)2]n (M = Mn2+ and Co2+) involving the triangular lattice are determined. The magnetic behaviors of 1 and 2 may come from the single-ion behavior and the specific arrangement of the metal ions.
A Novel Change of Light Transmission in Supercooled Liquid State of Ethylbenzene
Authors: Ishii Kikujiro , Okamura Takahiro , Ishikawa Nami , Nakayama Hideyuki
Published: September 2002

By the continuous elevation of temperature, ethylbenzene in the supercooled liquid state first turns opaque and then becomes transparent again before it finally crystallizes. These observations are possibly related to the appearance of the second amorphous state with a correlated structure that has recently been reported for triphenyl phosphite.
A Novel and Practical Amination of 4,5-Dichloropyridazin-3-ones via Reduction with Hydrazine Hydrate
Authors: Cao Song , Qian Xuhong , Song Gonghua , Huang Xiayu
Published: September 2002

A novel and simple protocol: the direct amination of 4,5-dichloropyridazinones can be carried out in hydrazine hydrate under mild conditions. 4-Chloro-5-hydrazinopyridazin-3-ones serves as a key intermediate in this reduction.
Chemical Structure and Intramolecular Spin-Exchange Interaction of [(VO)3(SbW9O33)2]12−
Authors: Yamase Toshihiro , Botar Bogdan , Ishikawa Eri , Fukaya Keisuke
Published: September 2002

The crystal structure determination of tris(vanadyl)-substituted tungstoantimonate(III) K11H[(VO)3(SbW9O33)2]·27H2O reveals that the [(VO)3(SbW9O33)2]12− anion contains three exterior VO2+ groups sandwiched by two α-B [SbW9O33]9− ligands in VIV···VIV separation of 5.411(8)-5.464(8) Å and is stabilized by equatorial three K+ ions triangle with virtual D3h symmetry. An observable spin-exchange interaction between VIV centers within the vanadyl coplanar triangle is demonstrated in terms of S = 1/2 and S = 3/2 states.
Molecular Recognition of Nucleosides and Nucleotides Based on Circular Dichroism Induced by Helix Formation of Poly[(4-dihydroxyborophenyl)acetylene]
Authors: Kawamura Hiroaki , Maeda Katsuhiro , Okamoto Yoshio , Yashima Eiji
Published: September 2002

Poly[(4-dihydroxyborophenyl)acetylene] was found to form a predominantly one-handed helical conformation upon complexation with various nucleosides and (oligo)nucleotides, and the complexes exhibited characteristic, split-type induced circular dichroisms depending on the nucleobases.
Sulfonylcalix[4]arene as a Bis-Tridentate Facial Ligand: Syntheses and Structures of Dinuclear Complexes, [M2(L)(H2O)2(dmf)4] (M = Co(II), Ni(II) ; H4L = p-tert-Butylsulfonylcalix[4]arene)
Authors: Kajiwara Takashi , Yokozawa Shuichi , Ito Tasuku , Iki Nobuhiko , Morohashi Naoya , Miyano Sotaro
Published: September 2002

Cobalt(II) and nickel(II) complexes with a tetraanionic ligand of p-tert-butylsulfonylcalix[4]arene were synthesized and their X-ray structures show that the calixarene acts as a bis-tridentate dinucleating ligand with the 1,2-alternate conformation.
1,2,3,4,5,6,7-Hexathiagermepanes: Synthesis, Structures, and the Ring Contraction to 1,2,3,4,5-Tetrathiagermolanes
Authors: Matsumoto Tsuyoshi , Matsui Yosuke , Nakaya Yukiko , Tatsumi Kazuyuki
Published: September 2002

The first 1,2,3,4,5,6,7-hexathiagermepanes Dmp(Ar)GeS6 [Dmp=2,6-dimesitylphenyl, Ar = Mes, Dep (2,6-diethylphenyl), Tip (2,4,6-triisopropylphenyl)] were synthesized along with 1,2,3,4,5-tetrathiagermolanes by sulfurization of the corresponding dihydrogermanes. The hexathiagermepane Dmp(Tip)GeS6 slowly converted to the tetrathiagermolane with release of elemental sulfur owing to the steric hindrance.
Two-Photon C 12(n, 4s) ← X 1A1 Absorption of Thioformaldehyde as Observed in (2+2) Resonance Enhanced Multiphoton Ionization Spectroscopy
Authors: Kasatani Kazuo , Kawasaki Masahiro , Sato Hiroyasu
Published: September 2002

Two-photon C 1B2(n, 4s) ← X 1A1 absorption of methanethial (thioformaldehyde) H2CS has been probed by (2+2) resonance enhanced multiphoton ionization spectroscopy (REMPI) for the first time. The REMPI spectrum has a well developed rotational structure with O, P, Q, R, and S branches, which has been simulated using rotational constants reported by Moule and co-workers.
A Novel Molten-Salt Method to Produce Nanocrystalline WS2
Authors: Peng Yiya , Meng Zhaoyu , Zhong Chang , Lu Jun , Yang Zhiping , Qian Yitai
Published: September 2002

Nanocrystalline WS2 was prepared by the reaction of elemental sulfur and sodium tungstate (or calcium tungstate) in an aluminum chloride molten-salt. XPS, XRD and TEM indicated that the product was 2H-WS2 nanoparticles with size of 20-50 nm and irregular morphology.
Synthesis and Structural Characterization of a Pd2+ Complex with p-tert-Butylsulfinylcalix[4]arene
Authors: Morohashi Naoya , Iki Nobuhiko , Miyano Sotaro , Kajiwara Takashi , Ito Tasuku
Published: September 2002

Single-crystal X-ray analysis has shown that p-tert-butylsulfinylcalix[4]arene (H4L) can bind Pd2+ ion by using either S or O atoms of bridging S=O groups in addition to phenolic oxygen atoms to form in [Pd2(H2L)(H3L)2] complex.
A Disilanyl Dianion and a Silyl Dianion from a Stable Silylene
Authors: West Robert , Schmedake Thomas A , Haaf Michael , Becker James , Mueller Thomas
Published: September 2002

The stable silylene, N,N′-di-t-butyl-1,3-diaza-2-sila-2-ylidene, is reduced by Na/K or C8K first to a disilanyl dianion and then to a silyl dianion. Both of these species can be derivatized by reaction with hydroxy compounds or with chlorotrimethylsilane.
Photochromism of a Dithienylethene Having Diphenylamino Side Groups in the Bulk Amorphous Phase
Authors: Fukudome Masato , Kamiyama Kazushi , Kawai Tsuyoshi , Irie Masahiro
Published: September 2002

1,2-Bis(2,4-dimethyl-5-phenyl-3-thienyl)perfluorocyclopentene was found to form an amorphous state in bulk by introducing diphenylamino substituents at both ends of the molecule. The glass transition temperature was as high as 103 °C. The amorphous film exhibited reversible color and refractive index changes by alternate irradiation with ultraviolet and visible light.
Photooxygenation of N21,N22-Bridged Isophlorin to 19-Benzoylisobilirubin
Authors: Setsune Jun-ichiro , Kashihara Kenji , Wada Ken-ichi
Published: September 2002

Antiaromatic isophlorin with N21,N22-(1,2-diphenyletheno) and N23,N24-(carboethoxymethano) double bridge was dioxygenated at the Cmeso–Cpyrrole-α double bond of the dipyrrylmethene moiety having the N21,N22-(1,2-diphenyletheno)-bridge, leading to an isobilirubin derivative that was characterized by X-ray crystallography.
New Low-Temperature Synthetic Method of Complex Inorganic Solids: Amorphous Route Based on Amorphous Nature of Soluble Giant Clusters
Authors: Eda Kazuo
Published: September 2002

The amorphous nature of molybdenum giant clusters (molybdenum blue species) was used to prepare compositionally well-arranged precursors (homogeneous amorphous phase), which are suitable for lower temperature syntheses of alkali-metal molybdenum oxide bronzes. Then, it was confirmed that soluble giant clusters such as molybdenum blue species afforded very attractive merits for materials syntheses.
Novel Enzyme-Catalyzed Ring-Opening Polymerization of Glycidol
Authors: Soeda Yasuyuki , Toshima Kazunobu , Matsumura Shuichi
Published: September 2002

Glycidol polymerized by the microbial resting cells and commercially available hydrolase enzyme having epoxide hydrolase activity without added water produced the water-soluble poly(glycidol). As a typical example, a mixture of glycidol and 5% lipase AK (Pseudomonas fluorescens) was stirred at 30 °C for 3 d to produce the poly(glycidol) with a weight-average molecular weight of 900.