bluuebunny/crossref_metadata_2025 huggingface dataset:
Prospect of Activating a Photocatalyst by Sunlight - A Quantum Chemical Study of Isomorphically Substituted Titania
Authors: Nishikawa Tomohiro , Shinohara Yuji , Nakajima Tsuyoshi , Fujita Masaki , Mishima Shozi
Published: November 2003

DV-Xα calculations indicated the possibility of shifting the absorption edge of titania to the sunlight region by isomorphic substituting of a transition metal cation for a titanium ion. Among the cations addressed here, Ni3+ and V5+ reduced the band gap most effectively. The efficiency of the reduction by the substituting cation increased as the radius of the cation decreased.
Photocatalytic Reduction of CO2 with H2O on Titanium Oxides Prepared within the FSM-16 Mesoporous Zeolite
Authors: Ikeue Keita , Yamashita Hiromi , Anpo Masakazu
Published: November 2003

Highly dispersed titanium oxide catalysts have been prepared within the mesoporous cavities of the FSM-16 zeolite (Ti-oxide/FSM-16 catalyst) by a CVD method and utilized for the photocatalytic reduction of CO2 with H2O to produce CH4 and CH3OH at 328 K. These Ti-oxide/FSM-16 photocatalysts exhibited high reactivity and selectivity for the formation of CH3OH, its reactivity and selectivity showing a good relationship with the photoluminescence yield of the catalyst which can be attributed to the radiative decay from the charge transfer excited state of the tetrahedral coordinated titanium oxides.
H-Gallosilicate-Catalyzed Degradation of Polyethylene into Aromatic Hydrocarbons Using Different Types of Reactors
Authors: Uemichi Yoshio , Suzuki Toshihiro
Published: November 2003

A fixed-bed flow reactor, in which melted polyethylene came into contact with H-gallosilicate catalyst, was highly effective in converting the polymer to aromatic hydrocarbons. The yield of aromatics was much lower when the degradation was performed by heating a mixture of the polymer and the catalyst in a batch reactor.
Control Factors of Two Reaction Modes of Pentacoordinate 1,2-Oxasiletanides, the Peterson Reaction and Homo-Brook Rearrangement
Authors: Naganuma Kenji , Kawashima Takayuki , Okazaki Renji
Published: November 2003

Thermolyses of pentacoordinate 1,2-oxasiletanides with or without a neopentyl group at the 3-position in the presence of a proton source afforded the corresponding olefin and/or alcohol, indicating that they are the intermediates of both the Peterson reaction and homo-Brook rearrangement which are two possible modes in the reaction of β-hydroxyalkylsilanes with bases.
Oxidation of Phenols Over Mesoporous (Cr)MCM-41 Molecular Sieves
Authors: Mahalingam Rathinam J , Badamali Sushanta K , Selvam Parsuraman
Published: November 2003

The catalytic performance of mesoporous chromium containing MCM-41 molecular sieves was investigated for the oxidation of phenols. The substrate conversion and the product selectivity are remarkably enhanced by ammonium acetate, acetylacetonate treatments of this unique catalyst. In particular, phenol shows excellent results compare to the TS-1 catalyst.
Rapid [1,5] Hydrogen Migration on 7-Alkoxycarbonyltropilidenes under Conformational Regulation
Authors: Sugimura Takashi , Kohno Harumi , Nagano Shinya , Nishida Futoshi , Tai Akira
Published: November 2003

The thermal [1,5] hydrogen migration of 7-alkoxycarbonyltropilidene was found to be accelerated by conformational regulation at the carbonyl group, which was mainly affected to the activation energy. Methyl substitutions on the 3- and 5-positions further increased the migration rate.
An Effective Method for the Preparation of Optically Active Polyoxy 8-Membered Ring Enone Corresponding to the B Ring of Taxol
Authors: Shiina Isamu , Shibata Jun , Imai Yumiko , Ibuka Ryoutarou , Fujisawa Hidehiko , Hachiya Iwao , Mukaiyama Teruaki
Published: November 2003

An effective method for the preparation of 8-membered ring enone 1 in sufficient quantities was developed. First, optically active trialkoxyaldehyde 3 was prepared by diastereoselective dihydroxylation of olefin 7 derived from d-pantolactone. Secondly, 8-chloro-7-oxoaldehydes 20α,β were newly synthesized by the following reactions: namely, MgBr2·OEt2-mediated diastereoselective aldol reaction of the aldehyde 3 with ketene (trimethylsilyl) acetal 15, direct 1,1-dichloroethylation of ester 17 with 1,1-dichloroethyllithium, and partial dehalogenation of the resulting α,α-dichloroethyl ketone 18 with nBu3SnH. Lastly, the chiral 8-chloro-7-oxoaldehydes 20α,β were converted to the 8-membered ring enone 1 by SmI2-mediated aldol cyclization.
Surface Transition Kinetics on Synthetic Metallic Diamond
Authors: Ohta Narumi , Nakabayashi Seiichiro , Fujishima Akira
Published: November 2003

On the heavily doped diamond electrode, the reactivity for the copper deposition was changed depending on an electrochemical hysteresis of the surface. On the electrode, which underwent hydrogen or oxygen evolution, though the reduction of Cu2+ proceeded on both, the reduced atom was trapped only on the surface on which the hydrogen was evolved in advance. The time course of this surface transition was investigated.
Oxygen-Carrying Cobaltporphyrin Complexed with Electroconductive Poly(3,4-azopyridylene)
Authors: Ito Fumiaki , Nishide Hiroyuki , Tsuchida Eishun
Published: November 2003

Poly(3,4-azopyridylene) was prepared and complexed with picket-fence cobaltporphyrin; the polymer complex displayed both the selective and reversible oxygen-binding and the electroconductivity of 10−5 S cm−1.
Intermolecular Excimer Formation in Dinuclear Metal Complexes
Authors: Yano Yayoi , Hino Kazuyuki , Nakata Risa , Sekiya Hiroshi , Maeda Yonezo
Published: November 2003

In this paper the intramolecular/intermolecular excimer formations of [Fe2(bpmp)(1-pyace)2](BF4)2, [ZnFe(bpmp)(1-pyace)2](ClO4)2 and [Zn2(bpmp)(1-pyace)2]ClO4 which contain 1-pyreneacetic acid as a chromophore are reported. The fluorescent properties of the ZnZn complex offer the intramolecular dimers of the two chromophores in addition to intermolecular dimers due to the intermolecular stacking. The ZnFe and FeFe complexes are under the strong influence of quenching and show weak intramolecular/intermolecular excimer formation in the concentration more than 10−4 M. The emission intensities and intensity ratios (IE/IM) of the fluorescence are dependent on the metal ions.
Fractionation of Boron Isotopes to Bis(2-hydroxyalkyl)amine Borate and Boric Acid in Aqueous Solutions
Authors: Hirotsu Takahiro , Sonoda Akinari , Makita Yoji , Kanoh Hirofumi , Takagi Norio , Ooi Kenta , Seno Manabu
Published: November 2003

10B is more fractionated to B(OH)L {H2L: a ligand having a bis(2-hydroxyalkyl)amino group (alkyl: ethyl and propyl)} with a tetrahedral coordination mode than to B(OH)3 with a planar triangular coordination mode in aqueous solutions, exhibiting an isotope separation factor of 1.027 at 25 °C, which is greater than the upper limit of anion exchangers.
Mechano-chemical Preparation of Novel Cellulose-Poly(ethylene glycol) Composite
Authors: Endo Takashi , Kitagawa Ryouichi , Zhang Farao , Hirotsu Takahiro , Hosokawa Jun
Published: November 2003

A new type of cellulose composite was mechano-chemically prepared by ball-milling mixtures of cellulose and poly(ethylene glycol) (PEG). The composites are probably formed by insertion of PEG molecules among cellulose crystalline molecular-chains, and accordingly the compatibilization of cellulose and PEG through the formation of hydrogen-bonds, exhibiting a different mode of orientation of cellulose from that of similar blends from solution systems.
Diastereoselective Aldol Reaction of α-Bromo Ketones with Aliphatic Aldehydes by Using Titanium(II) Chloride and Copper
Authors: Mukaiyama Teruaki , Kagayama Akifumi , Igarashi Koji , Shiina Isamu
Published: November 2003

Highly diastereoselective aldol reaction of α-bromo ketones with aliphatic aldehydes was successfully carried out by using titanium(II) chloride and copper in dichloromethane at low temperature. Similarly, Reformatsky-type reaction of α-bromo thioester with aliphatic aldehydes was promoted under mild conditions to afford β-hydroxy thioesters in good to moderate yields.
(Polymer/Liquid Crystal) Composite Films with High Electric Charge Holding
Authors: Jeong Hwan-Kyeong , Kikuchi Hirotsugu , Kajiyama Tisato
Published: November 2003

A (polymer/liquid crystal: LC) composite film with a high electric charge holding was prepared by a solvent-induced phase separation method. The (polydiisopropyl fumarate (Pdi-iPF)/TL205 (LC)) composite film sandwiched between two transparent electrodes exhibited highly stable electric charge holding over several hundreds seconds after the electric circuit connecting between the electrodes was opened. Reversible light transmission-light scattering switching upon an open circuit after the application of a pulse electric field and a short one, respectively, was achieved for the (Pdi-iPF/TL205) composite film.
Origin of π-Facial Diastereoselection in Nucleophilic Addition to 1,3-Diheteran-5-ones (Heteroatom = O, S). Theoretical Evidence for the Importance of Ground-State Effects
Authors: Tomoda Shuji , Kaneno Daisuke , Senju Takatoshi
Published: November 2003

The exterior frontier orbital extension model (the EFOE Model) strongly suggested that reversal of π-facial diastereoselection in nucleophilic additions of 1,3-diheteran-5-ones (heteroatom = O or S) may originate from the unique ground-state conformation and the π-facial difference in the LUMO extension around the carbonyl carbon rather than from transition state effects.
5-(1H-Benzotriazol-1-yloxy)-3,4-dihydro-1-methyl 2H-Pyrrolium Hexachloroantimonate (BDMP®): A Highly Efficient Immonium Type Peptide Coupling Reagent
Authors: Li Peng , Xu Jie Cheng
Published: November 2003

HOBt-based immonium type coupling reagent, 5-(1H-benzotriazol-1-yloxy)-3,4-dihydro-1-methyl 2H-pyrrolium hexachloroantimonate (BDMP) has been designed, synthesized and utilized to synthesize oligopeptides and biologically active peptides both in solution and solid phase with good yield, low racemization and fast reaction rate.
Determination of Critical Aggregation Concentrations of Self-Assembling Lipids in Nonpolar Organic Media Using Spiropyrans as Photochromic Probes
Authors: Hachisako Hiroshi , Nakayama Hiroki , Ihara Hirotaka
Published: November 2003

Critical aggregation concentrations of organic gel-forming lipids in nonpolar organic media such as benzene were found to be determined by measuring the first-order rate constants of merocyanine-to-spiropyran thermal isomerizations for spiropyrans added as probes.
The D2d Structure and Easy Rotation around the C=C Bond of the TCNE Dianion
Authors: Uno Bunji , Okumura Noriko
Published: November 2003

The structural and spectral characteristics of the tetracyanoethylene dianion (TCNE2−) have been investigated. The two-electron addition to the untibonding LUMO of TCNE causes the easy rotation around the C=C bond characterized by the formal single bond. The spectral measurements and MO calculations gives results that TCNE2− preferentially adopts the D2d and D2h structures in CH3CN and CH2Cl2, respectively.
Water Soluble Silver Nanoparticles Functionalized with Thiolate
Authors: Chen Sihai , Kimura Keisaku
Published: November 2003

Stable carboxylate-functionalized silver nanoparticles (1.4 - 5.7 nm in diameter) which can be separated as pure water-redispersible powder are synthesized by the reduction of silver nitrate with sodium borohydride in the presence of mercaptosuccinic acid (MSA) in methanol. The results show that the particle sizes can be controlled through varying the initial molar ratio of MSA to AgNO3. MSA exists in the form of sodium carboxylate and adsorbs H2O molecules on the particle surface.
Micelle-Templated Mesophases of Phenol-Formaldehyde Polymer
Authors: Moriguchi Isamu , Ozono Akemi , Mikuriya Kumiko , Teraoka Yasutake , Kagawa Shuichi , Kodama Masaya
Published: November 2003

Phenol-formaldehyde polymers and surfactant assembly was structuralized into lamella and disordered mesophases depending on the surfactant/phenol molar ratio at the synthesis.
A Convenient Preparative Method of Dibromoterphenyl and Bis(bromophenyl)diene Monomers Using Zirconacyclopentadienes
Authors: Takahashi Tamotsu , Tsai Fu-Yu , Li Yanzhong
Published: November 2003

Zirconacyclopentadienes prepared from 4,4′-dibromodiphenyldiynes or 1-(4′-bromophenyl)-1-alkynes reacted with dimethylacetylene dicarboxylate in the presence of CuCl afforded polyphenylene monomers which contain three benzene rings. Hydrolysis, chlorination with NCS, or allylation of the zirconacyclopentadienes gave a variety of polyphenylenedienylene monomers. Polymerization of these monomers using the system NiCl2(PPh3)2 (cat.)/Zn produced the corresponding polymers.
LaMnO3 Fine Powder Prepared by the Thermal Decomposition of a Heteronuclear Complex, LaMn(dhbaen)(OH)(NO3)(H2O)4
Authors: Aono Hiromichi , Tsuzaki Miyoko , Kawaura Akihiro , Sakamoto Masatomi , Traversa Enrico , Sadaoka Yoshihiko
Published: November 2003

The heteronuclear LaMn(dhbaen)(OH)(NO3)(H2O)4 complex was synthesized and perovskite-type hexagonal LaMnO3 was obtained by its thermal decomposition at 700 °C. Particle size of the samples decomposed at 600 °C and 700 °C is ca. 20 nm and 50 nm, respectively.
Appearance of the Induced Smectic A Phase in the Binary System between Two Troponoid Twins with the Opposite Dipole Moment
Authors: Takemoto Manabu , Mori Akira , Ujiie Seiji
Published: November 2003

A new troponoid twin system, in which two tropone carbonyl groups direct outside, was prepared, but they were not mesogenic. The binary system between the new twins and the troponoid twins with the two tropone carbonyl groups directed inside, which had a monotropic smectic C phase, showed an induced enantiotropic smectic A phase. From the X-ray diffraction study of the binary systems, a molecular packing model perpendicular to the lamellar planes was proposed, in which the dipole moments of tropone rings were canceled.
Production of Hydrogen through Decomposition of Methane with Ni-supported Catalysts
Authors: Otsuka Kiyoshi , Seino Takeshi , Kobayashi Shoji , Takenaka Sakae
Published: November 2003

Active and selective Ni-based catalysts for the production of hydrogen through the decomposition of methane were looked for. The most active catalyst having the longest life time was a nickel catalyst supported on Cab-O-Sil. Approximately 1200 carbon atoms per a nickel atom deposited on the Ni(5 wt%)/Cab-O-Sil catalyst at 793 K before a complete deactivation was observed.
Determination of Absolute Configurations of Tertiary Alcohols by NMR Spectroscopy
Authors: Takahashi Haruko , Kato Naoko , Iwashima Makoto , Iguchi Kazuo
Published: November 2003

A method has been developed for determining the absolute configurations of acyclic tertiary alcohols using their 2NMA [methoxy-(2-naphthyl)acetic acid] esters. The 1H NMR spectra of (R)- and (S)-2NMA esters of model compounds were measured, and Δδ values (δR-ester − δS-ester) were calculated. The absolute configuration for tertiary hydroxy group is determined based on the sign of Δδ values like that for secondary hydroxy group.
X-Ray Crystal Structure and Dynamic Behavior of Pentafluoro-9,10-disila-9,10-dihydroanthracene Anion Salts Having Transannular 1,4-Fluorine Bridge
Authors: Kira Mitsuo , Kwon Eunsang , Kabuto Chizuko , Sakamoto Kenkichi
Published: November 2003

Potasium-18-crown-6 and tetraethylammonium ion salts of pentafluoro-9,10-disila-9,10-dihydroanthracene anion (5a and 5b) have an unsymmetrical transannular 1,4-fluorine bridge in the solid states. In solution, 5a and 5b show a facile intramolecular fluorine exchange.
A Thiourea-Functionalized Benzo-15-crown-5 for Cooperative Binding of Sodium Ions and Anions
Authors: Nishizawa Seiichi , Shigemori Kazuki , Teramae Norio
Published: November 2003

A new bifunctional receptor 1 for cooperative complexation of cations and anions is synthesized on the basis of benzo-15-crown-5, functionalized with a thiourea moiety as anion binding sites. When Na+ is bound to the crown moiety of 1, the association constants of I−, Br− and NO3− in CD3CN are significantly increased, as compared with free 1. Thermodynamic studies indicate that these large increases in complex stabilities can be ascribed primarily to the enthalpic effect.
A Novel Adduct of TCNQ Dianion with Schiff-Base Cobalt(III) Complex in N-Bonded Coordination Mode in Dmf Solution [TCNQ = 7,7,8,8-Tetracyanoquinodimethane]
Authors: Ohashi Yukako , Oogo Yoshiki , Nakamura Mikio
Published: November 2003

Formation of a stable novel adduct, [Co(III)(saloph)]2 TCNQ(-II), has been confirmed by analysis of the 1H NMR spectra of the N,N-dimethylformamide(dmf)-acetonitrile solution of LiTCNQ and [N,N′-o-phenylenebis(salicylideneaminato)] cobalt(II), denoted as [Co(II)(saloph)]. The time-resolved spectra of the UV-vis absorption of the LiTCNQ-[Co(II)(saloph)] solutions gave information concerning the formation process of the adduct.
Biosynthesis of Poly(3-hydroxyalkanoate)s with Terminal Alkene Groups in the Side Chains by Chromobacterium sp.
Authors: Kimura Hiroshi , Sasaki Shintaro , Inukai Shinobu , Takeishi Makoto
Published: November 2003

Chromobacterium sp. isolated from a river soil produced the poly(3-hydroxyalkanoate)s [P(3HA)s] with unsaturated groups at the terminal positions of the β-substituents when 10-undecenoic acid (UDEA) was fed as the carbon sources.
New Cyclohexeno-fused Tetrachalcogenofulvalenes and an Electron Correlated TCNQ Salt
Authors: Sakurai Naoki , Mori Hatsumi , Tanaka Shoji , Moriyama Hiroshi
Published: November 2003

New cyclohexeno-fused donors, CHET-TTF 1, CHESe-TTF 2, CHST 3 and CHEO-TTF 4, have been synthesized and the prepared 1·TCNQ is electron correlated system with two-dimensional electronic structure by a tight-binding band calculation, where magnetic susceptibility is retained in Curie-like behavior down to 2 K.
A Mandala-Patterned Bandanna-Shaped Porphyrin Oligomer, C1244H1350N84Ni20O88, Having a Unique Size and Geometry
Authors: Sugiura Ken-ichi , Tanaka Hiroyuki , Matsumoto Takuya , Kawai Tomoji , Sakata Yoshiteru
Published: November 2003

A porphyrin henicosamer was designed, synthesized, and structurally characterized using scanning tunnelling microscopy.
Surface Plasmon Resonance Detector for Capillary Chip Electrophoresis
Authors: Waseda Satoru , Shimosaka Takuya , Uchiyama Katsumi , Hobo Toshiyuki
Published: November 2003

A novel universal detection system for capillary chip electrophoresis utilizing surface plasmon resonance (SPR) detection was developed. Nafion tube was used as a septum to draw electric current outside the flow without generating any bubble in the capillary channel. Polydimethyl siloxane as a capillary chip could easily attained this setup. We could successfully observe small change in refractive index by SPR under elctroosmotic flow.
Overall Water Splitting into H2 and O2 under UV Irradiation on NiO-loaded ZnNb2O6 Photocatalysts Consisting of d10 and d0 Ions
Authors: Kudo Akihiko , Nakagawa Seira , Kato Hideki
Published: November 2003

NiO-loaded ZnNb2O6 photocatalysts showed an activity for decomposition of pure water into H2 and O2 under band gap irradiation (hν > 4.0 eV). This oxide photocatalyst is a new type of a photocatalyst material from the view point of the component because it consists of d10 and d0 metal ions.
2,3-Dichloro-5,6-dicyano-p-benzoquinone (DDQ) as a Highly Efficient and Mild Catalyst for Diethyl Acetalization of Carbonyl Compounds
Authors: Karimi Babak , Ashtiani Ashraf Miri
Published: November 2003

Various types of structurally different carbonyl compounds in the presence of ethyl orthoformate (EtO)3CH could be efficiently converted to their diethyl acetals by using a catalytic amount (1-3 mol%) of DDQ under mild reaction conditions.
Electrochemistry of Hypericin Incorporated into a Cationic Lipid Film on a Graphite Electrode in an Aqueous Medium
Authors: Sagara Takamasa , Kaba Narimasa , Nakashima Naotoshi
Published: November 2003

Quasi-reversible two-consecutive one-electron reduction processes of hypericin (Hyp) in an aqueous medium were achieved by incorporating Hyp into a cast film of a synthetic cationic lipid, dioctadecyldimethylammonium bromide (2C18N+Br−), coated on a basal-plane pyrolytic graphite (BPG) electrode. Importance of the electrostatic interaction between Hyp anions and the cationic sites in the matrix was suggested.
Asymmetric Borane Reduction of Prochiral Ketones Using Aluminum Triethoxide and Chiral Amino Alcohols
Authors: Yanagi Takashi , Kikuchi Ken , Takeuchi Hideki , Ishikawa Takehiro , Nishimura Toshihiro , Kamijo Tetsuhide
Published: November 2003

The asymmetric borane reduction of prochiral ketones with catalysts prepared in situ from aluminum triethoxide and chiral amino alcohols was examined, and the corresponding chiral alcohols were obtained in high optical purity.
Fibrous Self-Organization of an Azopyridine Carboxylic Acid through Head-to-Tail Hydrogen Bonds
Authors: Aoki Ken-ichi , Nakagawa Masaru , Ichimura Kunihiro
Published: November 2003

Fibrous materials were formed from an alkaline solution of an azopyridine carboxylic acid as a result of the intermolecular head-to-tail hydrogen bonding and of the suppressive effect of an alkyl side chain on the π-π stacking of the molecules.
Photocatalytic Decomposition of Pure Water into H2 and O2 over SrTa2O6 Prepared by a Flux Method
Authors: Kato Hideki , Kudo Akihiko
Published: November 2003

Orthorhombic (orth.) SrTa2O6 powder which was hardly obtained by a solid state reaction was easily synthesized by using a strontium borate flux. The native SrTa2O6 powder showed photoluminescence and a photocatalytic activity for decomposition of pure water into H2 and O2. The photocatalytic activity was drastically increased by loading a NiO co-catalyst even without pretreatment. The optimum amount of NiO loaded was 0.10 wt%. The quantum yield of the NiO(0.10 wt%)/SrTa2O6 photocatalyst was 7% at least.
Preparation of Monolayers of Ion-Paired Macrocyclic Amphiphiles to Estimate a Critical Free Space Required for Azobenzene Photoisomerization
Authors: Nakagawa Masaru , Watase Reiko , Ichimura Kunihiro
Published: November 2003

A novel family of ion-paired macrocyclic amphiphiles consisting of a tetracationic cyclophane and long-chain sulfonates was developed to form stable monolayers incorporating azobenzene moieties with tailor-made photoisomerizability.
Nanosecond and Picosecond Optical Limiting Properties of a Square-planar Complex C30H24N6O4S4Cu, CuL2 [HL = p-nitrobenzaldehyde S-benzyl dithiocarbazate]
Authors: Zhu Xuhui , Chen Xiaofeng , Zhang Yong , You Xiaozeng , Tan Weilian , Ji Wei
Published: November 2003

Optical limiting properties of a square-planar complex C30H24N6O4S4Cu, CuL2 [HL = p-nitrobenzaldehyde S-benzyl dithiocarbazate] were investigated with laser pulses of 7-ns and 35-ps duration. The measured nanosecond and picosecond limiting thresholds for CuL2 are ca. 1 and 1.4 J cm−2 at 532 nm, respectively. The nanosecond limiting threshold is comparable to that of C60.
Electrochemical Detection of Serotonin Using Conductive Diamond Electrodes
Authors: Sarada Bulusu V , Rao Tata N , Tryk Donald A , Fujishima Akira
Published: November 2003

The electrochemical detection of serotonin with highly boron-doped diamond thin film electrodes was investigated by use of flow injection analysis (FIA) with amperometric detection. The voltammetric behavior of diamond indicated low background current and a low tendency to adsorb the oxidative products on the electrode surface, in comparison to the glassy carbon electrode. An experimental amperometric detection limit of 10 nM (0.2 pmol) was obtained for the FIA technique, demonstrating that diamond is a stable and sensitive electrode for serotonin determination.
Catalytic Decomposition of CFC-12 over WO3/TiO2
Authors: Ma Zhen , Hua Weiming , Tang Yi , Gao Zi
Published: November 2003

CFC-12 was decomposed completely on WO3/TiO2 in the presence of water vapor at 265 °C, and the selectivity to CO2 was above 99.8%. The catalytic activity and selectivity remained steady during 120 h on stream. WO3-modified Al2O3, SnO2 and Fe2O3 showed less activity than WO3/TiO2 for the decomposition of CFC-12, but they were more active than the corresponding metal oxides, too.
Thermoelectric Properties of Alternatively Layered Films of Polyaniline and (±)-10-Camphorsulfonic Acid-Doped Polyaniline
Authors: Yan Hu , Toshima Naoki
Published: November 2003

Thermoelectric performance of polyaniline can be improved by formation of multilayered film structure. The alternatively layered films are composed of electrically insulating emeraldine base layers and electrically conducting (±)-10-camphorsulfonic acid (CSA)-doped emeraldine salt layers. The multilayered film exhibited 3.5 times higher thermoelectric power factor at ca. 300 K than a bulk film of polyaniline doped by CSA.
Synthesis and Characterization of a Novel Palladium(II) Complex Polymer Having Network Structure with Guest Water Molecules
Authors: Cao Rong , Su Weiping , Hong Maochun , Tatsumi Kazuyuki
Published: November 2003

The polymeric palladium complex of [Pd3K6(i-mnt)3(H2O)2]n (i-mnt = [(S2C=C(CN)2]2−) has been prepared from the reaction of PdCl2 and K2[(S2C=C(CN)2] in CH3CN. The complex has three dimensional network structure, in which two Pd, two K, four S, four N and twelve C atoms form a 24-membered ring, and the rings are further arranged in eclipsed configuration along c axis to give a channel with H2O as guest molecules.
Large Scale Supramolecular Self-Assembly of Graft-Copolymers Prepared by Rapid Evaporation of Organic Solvents
Authors: Kishida Akio , Seto Fusako , Hiwatari Ken-ichiro , Serizawa Takeshi , Muraoka Youichiro , Akashi Mitsuru
Published: November 2003

Large scale supramolecular self-assembly was prepared by using poly(ethylene glycol) (PEG) macromonomer-g-poly(styrene) (PSt) copolymers. The ordered structure of mesh- and crater-like morphologies were obtained depending on St/macromonomer ratio and the solution concentration.
A Mild and Rapid Regeneration of Alcohols from Allyl Ethers by ZrCl4/NaBH4
Authors: Chary K Purushothama , Mohan G Hari , Iyengar D S
Published: November 2003

A new extremely facile, spontaneous and efficient cleavage of allyl protection is developed employing ZrCl4/NaBH4.
A New Strategy toward Construction of Organic-Inorganic Hybridized Molecules. An Infinite One-Dimensional Chain Structure Assembled with Hydrogen- and Coordinate-Bonds
Authors: Kitamura Hideki , Ozawa Tomohiro , Jitsukawa Koichiro , Masuda Hideki , Einaga Hisahiko
Published: November 2003

Two novel organic-inorganic hybridized molecules assembled with hydrogen- and coordinate-bonds, [Rh2(O2CMe)4(daapy)2] (daapy = 2,6-diacetylaminopyridine) and {[Rh2(O2CMe)4][Ni(bpbg)2]}n (bpbg = biphenylbiguanide), have been prepared, which have been characterized by UV-vis, IR, and 1H NMR spectroscopic and thermogravimetric (TG) and X-ray diffraction methods.
Nickel-Catalyzed Tandem Coupling of Enones, Alkynes, Alkynylzincs, and Chlorotrimethylsilane
Authors: Ikeda Shin-ichi , Kondo Kouji , Sato Yoshiro
Published: November 2003

A nickel complex catalyzes a new tandem coupling of chlorotrimethylsilane (Me3SiCl), α,β-enones 1, alkynes 2, and di(alkynyl)zincs 7 (R′ = Bu, t-Bu, Me3Si, and Ph) to give the coupling products 3. This procedure was complementary to the reaction with alkynyltins.
Characteristic Molecular Patterns Formed by N-Octadecylbenzamide and N-8-Quinolyloctadecanamide Self-assembled on a Graphite Surface
Authors: Qian Pu , Nanjo Hiroshi , Yokoyama Toshiro , Suzuki Toshishige M
Published: November 2003

Self-assembled monolayers of N-octadecylbenzamide (ODB) and N-8-quinolyloctadecanamide (ODQ) have been observed on the solution-solid interface by scanning tunneling microscope (STM). ODB molecules form stripe shaped lamella structure whereas ODQ gave a mosaic pattern in which four molecular sets are interlocked alternately like jigsaw pieces.
Palladium(II)-induced Alkali Metal Ion Incorporation of 2,6-Disubstituted Pyridines with Bis(alkoxyethyl) Malonate Subunits
Authors: Mutou Tomoko , Amimoto Kiichi , Kanatomi Hajime , Koyama Hiroyuki , Kawato Toshio
Published: November 2003

A series of 2,6-bis(2,2′-dicarbalkoxyethyl)pyridine ligands were prepared. A couple of the ligands linked by a trans-PdCl2 unit extracted alkali metal ions from an aqueous media into a chloroform media, while a single pyridine ligand did not work as an extractive reagent.
Electrochemical Evidence of the Redox-controlled Ligand Exchange of the Heme in the CO-sensing Transcriptional Activator CooA
Authors: Nakajima Hiroshi , Aono Shigetoshi
Published: November 2003

The CO-sensing transcriptional activator CooA contains the six-coordinate, low-spin protoheme as a CO sensor. In this work, the reduction and oxidation midpoint potentials of CooA were determined by electrochemical redox titrations, which were −320 mV and −260 mV (vs. NHE), respectively. The different midpoint potentials provide evidence for exchange of the heme axial ligand during the change in the redox state of the heme.
Silapericyclyne, (Ph2SiC≡C)6: Spontaneous Conformational Resolution of Boat- and Chair-‘Exploded’ Cyclohexane
Authors: Unno Masafumi , Saito Takashi , Matsumoto Hideyuki
Published: November 2003

The silapericyclyne, (Ph2SiC≡C)6 was found to undergo spontaneous conformational resolution into the chair and boat conformations by crystallization from THF-MeOH. In solution, these two isomers rapidly interconvert, and could not be separately detected even at low temperature by 1H NMR.
Effect of Pulsed Illumination on the Belousov-Zhabotinsky Reaction Catalyzed with Tris(bipyridine) Ruthenium(II) in Continuous Stirred Tank Reactor
Authors: Matsumura-Inoue Takeko , Nakamura Tatsuhito , Mori Yoshihito , Hanazaki Ichiro
Published: November 2003

The photochemical response of BZ reaction with photosensitive Ru(bpy)32+ has been studied under pulsed illumination in a continuous–flow stirred tank reactor, CSTR. Two types of photo-response, the advanced and delayed phase shifts of oscillation, are observed depending on the initial concentrations of malonic acid (MA) or Br− and the timing of a pulsed illumination.
A Low Temperature Nitridation Route for Nanocrystalline AlN
Authors: Lu Qingyi , Hu Junqing , Tang Kaibin , Qian Yitai , Zhou Guien , Liu Xianming , Xing Jinyun
Published: November 2003

6 nm crystalline AlN has been synthesized through a simple reaction between commercial Al and NH4Cl in an autoclave at 580 °C which is much lower than those of traditional methods. X-ray diffraction result indicates the formation of hexagonal AlN nanocrystallites. Transmission electron microscopy image shows that the average size of the crystallites is 6 nm. The possible synthetic mechanism of AlN is proposed
Novel Rh(I)-Catalyzed Reaction of Arylzinc Compounds with Methyl Halides
Authors: Hossain Kabir M , Takagi Kentaro
Published: November 2003

The cross-coupling reactions of arylzinc compounds with methyl iodide or substituted methyl halides like benzyl bromides took place smoothly by the catalysis of Rh(I)-dppf complex.
Chiral-Selective Formation of S-Bridged CoIIIPdIICoIII Trinuclear Complexes by Using trans(N)-[Co(d-pen-N,O,S)2]− as a Bidentate-S,S Complexed-Ligand (d-pen = d-Penicillaminate)
Authors: Konno Takumi , Matsuno Nikichi , Okamoto Ken-ichi , Hirotsu Masakazu
Published: November 2003

The reaction of [PdCl2{Co(aet)2(en)}]+ (aet = 2-aminoethanethiolate) with trans(N)-[Co(d-pen-N,O,S)2]− (d-pen = d-penicillaminate) in water led to the formation of three optically active S-bridged CoIIIPdIICoIII complexes, [Pd{Co(d-pen-N,O,S)2}2]0 (1), Λ-[Pd{Co(d-pen-N,O,S)2}{Co(aet)2(en)}]2+ (Λ-2), and ΔΔ-[Pd{Co(aet)2(en)}2]4+ (ΔΔ-3). The molecular structure of Λ-2 was determined by X-ray crystallography.
Synthesis and Structure of Chiral (R)-2,2′-Bis-Silyl-Substituted 1,1′-Binaphthyl Derivatives
Authors: Hoshi Takashi , Shionoiri Hiroshi , Suzuki Toshio , Ando Masayoshi , Hagiwara Hisahiro
Published: November 2003

First synthesis of optically active 2,2′-bis-silyl-substituted 1,1′-binaphthyl derivatives, (R)-(+)-2,2′-bis(trimethylsilyl)-1,1′-binaphthyl ((R)-(+)-1) and (R)-(−)-2,2′-bis(dimethylphenylsilyl)-1,1′-binaphthyl ((R)-(−)-2), has been accomplished by the direct bis-silylation of chiral 2,2′-dibromo-1,1′-binaphthyl (DBBN). The molecular structure and the absolute configuration of (R)-(−)-2 have been determined by means of X-ray crystallography.
Stereocontrolled Synthesis of (+)-Acuminolide and Determination of Its Absolute Configuration
Authors: Furuichi Noriyuki , Kato Mariko , Katsumura Shigeo
Published: November 2003

As a demonstration for an easy supply of the enantiomerically pure intermediate for the synthesis of labdane diterpenoids, stereocontrolled synthesis of (+)-acuminolide was achieved, and its absolute configuration was determined.
Structures and Electrical Properties of (EO-TTP)2AsF6
Authors: Misaki Yohji , Tanaka Koji , Taniguchi Masateru , Yamabe Tokio , Kawamoto Tadashi , Mori Takehiko
Published: November 2003

The title material, where EO-TTP is 2-(4,5-ethylenedioxy-1,3-dithiol-2-ylidene)-5-(1,3-dithiol-2-ylidene)-1,3,4,6-tetrathiapentalene, shows metallic conducting behavior down to 1.5 K. X-Ray structure analysis reveals it has the so-called β-type array of donors.
New Near-Infrared Spectrophotometry for d8 Metal Ions, NiII and PtII, with 2,2′-Dithiobis(1-aminonaphthalene) in Aqueous Micellar Solutions
Authors: Terazono Yukiko , Hoshino Hitoshi , Yotsuyanagi Takao
Published: November 2003

1-Amino-2-naphthalenethiolate ion (C10H6NH2S−), produced from 2,2′-dithiobis(1-aminonaphthalene) (DTAN), forms 1:2 chelates with d8 metal ions (NiII and PtII) in aqueous PONPE 20 micellar solutions, and then subsequent oxidation of the chelates with O2 yield new NIR-absorbing chelates [MII(C10H6NHS·)2]0. The remarkable NIR absorption properties are as follows: for PtII (794 nm) ε = 5.03 × 104 M− cm−1; for NiII (884 nm) ε = 4.73 × 104 M−1 cm−1.
Palladium-Catalyzed Three-Component Coupling Reaction of Aryl Halides, Norbornadiene and Alkynols. Convenient Synthesis for Their Ternary Coupling Products
Authors: Choi Cheol-Kyu , Tomita Ikuyoshi , Endo Takeshi
Published: November 2003

2,3-Disubstituted norbornenes were obtained by the Pd/Cu-catalyzed three-component ternary coupling reaction of aryl halides, norbornadiene, and alkynols in the presence of aqueous NaOH and a phase transfer catalyst in toluene at 100 °C in high yields.
Synthesis of (Rc,Ss)-1,1,1-Trifluoro-3-(p-tolylsulfinyl)-2-propanol by an Asymmetric Reduction with a Yeast, Yamadazyma farinosa, as a Key-step
Authors: Sakai Atsushi , Bakke Mikio , Ohta Hiromichi , Kosugi Hiroshi , Sugai Takeshi
Published: November 2003

(Rc,Ss)-1,1,1-trifluoro-3-(p-tolylsulfinyl)-2-propanol (>99% e.e.), an important reagent for the asymmetric protonation of substituted enolates, was prepared (70%) from (S)-methyl p-tolyl sulfoxide. The stereoselectivity of the Yamdazyma farinosa-catalyzed reduction of carbonyl groups, the key step for the introduction of an asymmetric carbon, was greatly affected by the stereochemistry of the asymmetric sulfur atom. The reduction of (S)-1,1,1-trifluoro-3-(p-tolylsulfinyl)-2-propanone proceeded smoothly and in a quite stereoselective manner to give the desired compound, while a 76 : 24 mixture of (Rc,Rs)- and (Sc,Rs)-isomers was obtained from the substrate with the opposite (R)-configuration.
Mixed Electronic-Oxide Ionic Conductivity and Oxygen Permeating Property in Ni Doped LaGaO3 Perovskite Oxide
Authors: Arikawa Hiroshi , Yamada Takashi , Ishihara Tatsumi , Nishiguchi Hiroyasu , Takita Yusaku
Published: December 2003

It was found that LaGaO3 perovskite oxide doped with Ni for Ga site exhibits a high mixed electronic-oxide ionic conduction. Oxygen permeation rate was increased with increasing Ni content and it attained to a maximum value of 2.15 cm3/min cm2 at 1273 K when 25 mol% Ni was doped.
A Macrocyclic Sialic Acid Cluster as a Host, as an Adsorbate, and as a Ligand for Lectin and Virus
Authors: Fujimoto Kazuhisa , Hayashida Osamu , Aoyama Yasuhiro , Guo Chao-Tan , Hidari Kazuya I-P Jwa , Suzuki Yasuo
Published: December 2003

A calix[4]resorcarene-based macrocyclic octa(sialic acid) derivative 1d was prepared. It forms complexes with such guests as rose bengal in water. It forms a closely packed monolayer on an SPR sensor chip; a sialo-targeting lectin is readily adsorbed on the saccharide residues exposed to bulk water. Compound 1d also inhibits the hemagglutination of human erythrocytes and also cytopathic effect of MDCK (Madine-Darby canine kidney) cells mediated by human influenza A viruses at concentrations of 5-50 μM.
Atomic Force Microscopy of Photochemistry of 4,4′-Dimethylbenzophenone in the Solid State
Authors: Zeng Qingdao , Wang Chen , Bai Chunli
Published: December 2003

The formation of regular nanostructures by photodimerization of 4,4′-dimethylbenzophenone (1) through intermolecular hydrogen abstraction, is investigated using atomic force microscopy (AFM) and known crystal packing data. AFM reveals that the crystal face (001) of 1 exhibits volcanoes. All the experimental results are correlated with the crystal structure. Molecular interpretation of the AFM features of 1 is given.
Post-Metallocenes: A New Bis(salicylaldiminato) Zirconium Complex for Ethylene Polymerization
Authors: Matsui Shigekazu , Mitani Makoto , Saito Junji , Tohi Yasushi , Makio Haruyuki , Tanaka Hidetsugu , Fujita Terunori
Published: December 2003

A new bis(salicylaldiminato) zirconium complex was synthesized and its structure determined by X-ray analysis. This complex displayed an exceptionally high ethylene polymerization activity of 519 kg-PE/mmol-Zr·h using methylaluminoxane (MAO) as a cocatalyst. In contrast, by using Ph3C+B−(C6F5)4 / iBu3Al as a cocatalyst, the complex furnished polyethylene of exceptionally high molecular weight (Mv; 505 × 104).
Synthesis of Centered Icosahedral Europium Cluster Formed by Bis(l-prolinato)nickel(II) Ligands and Isolation of an Electrochemically Reduced Product of Its Cluster
Authors: Igarashi Satoshi , Yukawa Yasuhiko
Published: December 2003

A centered icosahedral europium(III) cluster formed by bis(l-prolinato)nickel(II) ligands was prepared and an electrochemically reduced product of its cluster was isolated. The crystal of the reduced product was isomorphous to that of the EuIII-cluster and the cluster structure was retained in the reduced product.
Heat Shock Protein 70B mRNA Expression in L929 Cells Attached on Lipid Films
Authors: Kishida Akio , Matsuyama Takahisa , Nakashima Mihoko , Serizawa Takeshi , Sugimura Kazuhisa , Akashi Mitsuru
Published: December 2003

L929 cells adhesion and function on the lipid films prepared by casting method were studied. The function of the cells adhered on to lipid films was estimated by HSP70B mRNA analysis. It comes clear that L929 cells adhered on the synthetic lipid films suffered some stress from the substrates.
Photoamination of 1,2-Diarylcyclopropanes Using 2,2′-Dialkoxy-1,1′-binaphthalene as Redox-Photosensitizer
Authors: Yasuda Masahide , Kojima Ryuji , Tsutsui Hiroshi , Watanabe Louis A , Hobo Junpei , Yamashita Toshiaki , Shiragami Tsutomu , Shima Kensuke
Published: December 2003

1-Amino-1,3-diarylpropanes were prepared by the photoamination of 1,2-diarylcyclopropanes with NH3, using 2,2′-dialkoxy-1,1′-binaphthalene and m-dicyanobenzene as sensitizers and electron acceptor.
Study on the ET Process of SOD at Cysteine Modified Gold Electrode
Authors: Wu Xiaqin , Meng Xiaoyun , Wang Zhesu , Zhang Zongrang
Published: December 2003

Cysteine-modifed gold wire electrode was used for the first time to examine the promoted electron transfer process of superoxide dismutase. Electrochemical Quartz Crystal Microbalance technique was combined with cyclic voltammetric study for the understanding of coupled adsorption/desorption process of different states of SOD molecules.
Design, Synthesis, and Anti-HIV Activity of “Multi-Layered” Macromonocyclic Polyamines
Authors: Iwata Masaaki
Published: December 2003

“Multi-layer” cyclic polyamines were designed and synthesized, of which several compounds were found to be potential anti-HIV agents in antiviral activity assays against human T-lymphotropic virus type III (HTLV-IIIb) in infection to MT-4 cells.
Super Uranophiles: Application to Highly Effective Solvent Extraction of Uranyl Ion in the Presence of Methyltrioctylammonium Chloride
Authors: Nishida Masashi , Sonoda Miwako , Ishii Daido , Yoshida Isao
Published: December 2003

By using hydroxycalix[n]arene-p-sulfonates, Hj1nn− (n = 6 and 8) known as super uranophiles, uranyl ion, UO22+, in aqueous solution was efficiently extracted by chloroform in the presence of methyltrioctylammonium chloride, MTA+Cl−. The extracted species were found to be the ionic associates, [(UO22+)(168−)(H+)−3](MTA+)9 and [(UO22+)2(1812−)(H+)−3](MTA+)11.
Synthesis and Structure of Tetrakis Carboxylato-Bridged Dinuclear Manganese(II) Quinoline Complexes, with Carboxylates Diphenylacetate and 2,2-Diphenylpropanoate
Authors: Nakashima Michio , Maruo Hiroshi , Hata Tetsuya , Tokii Tadashi
Published: December 2003

Two dinuclear Mn(II) quinoline complexes with diphenylacetate 1 or 2,2-diphenylpropanoate 2 have been prepared. Single crystal X-ray crystallography revealed the molecular structure to be the form of copper(II) acetate’s. Bonding distances Mn-Mn, Mn-O, and Mn-N for 1 are 3.131(2), 2.116, and 2.193(5) Å, respectively, and those for 2 are 3.168(4), 2.117, and 2.215(4) Å, respectively. Anomalousness of Mn-Mn magnetic interaction of this type complexes is demonstrated.
Rh4S7 and Ir3CuS6 Clusters with Di- and Trisulfido Ligands Derived from Dinuclear Hydrogensulfido Complexes
Authors: Kochi Takuya , Tanabe Yoshiaki , Tang Zhen , Ishii Youichi , Hidai Masanobu
Published: December 2003

Reactions of the dinuclear hydrogensulfido-bridged complexes [Cp*MCl(μ-SH)2MClCp*] (M = Rh, Ir) with CuCl2·2H2O lead to formation of Rh4S7 and Ir3CuS6 clusters [(Cp*Rh)4(μ3-S2)2(μ4-S3)][CuCl2]2 and [(Cp*Ir)3(μ3-S2)3(CuCl2)][CuCl2] through the oxidative S–S bond formation, the former of which contains a trisulfido ligand of the unprecedented μ4-η2:η1:η1:η1 coordination mode.
Chemical Ionization of n-Paraffins (C14-C18) by CH5+, C2H5+, and C3H5+ in an Ion-Trap Type of Mass Spectrometer
Authors: Tsuji Masaharu , Tanaka Yuki , Arikawa Takeshi , Nishimura Yukio
Published: December 2003

Chemical ionization of n-paraffins (CnH2n+2 : n = 14∼18) by the CH5+, C2H5+, and C3H5+ ions has been studied using an ion-trap type of GC/MS under a reactant-ion-selected mode. In all the reactions, CnH2n+1+ and CmH2m+1+ (m = 3∼n−3) ions were observed. The most favorable fragment CmH2m+1+ ion in the CH5+ reaction was m = 8, while that in the C2H5+ and C3H5+ reactions was m = n−5 or n−6.
Cadmium Iodide Catalyzed and Efficient Synthesis of Acetals under Microwave Irradiations
Authors: Laskar Dhrubojyoti Dey , Prajapati Dipak , Sandhu Jagir S
Published: December 2003

A new selective method of acetalization of aldehydes and ketones with 1,2-diols, 1,3-diols or alcohols mediated by cadmium iodide under microwave irradiation is achieved in excellent yields.
Synthesis of Water-soluble Oxidized Chitosan Derivatives and Their Biological Activity
Authors: Terada Naofumi , Morimoto Minoru , Saimoto Hiroyuki , Okamoto Yoshiharu , Minami Saburo , Shigemasa Yoshihiro
Published: December 2003

Oxidized chitosan derivatives were prepared by CrO3 oxidation of chitosan followed by N-acetylation, and their effect on canine polymorphonuclear cells was evaluated. The water-solubility of oxidized chitosan derivatives (DS: 0.10-0.28) in the range of pH 1-13 was controlled by the degree of N-acetylation (DA), and the oxidized chitosan derivatives of DA 76 and 83% were soluble in water at the neutral pH range. Effect of oxidized chitosan derivatives on canine polymorphonuclear cells (PMNs) was estimated by the reported chemiluminescence (CL) technique, and the peak count of CL induced by zymosan after the treatment of PMNs with oxidized chitosan derivatives was lower than that induced by only zymosan.
Metallohelice: Effects of Hydrogen Bond Interactions on Helical Morphology
Authors: Zhang Yugen , Jianmin Li , Nishiura Masayoshi , Deng Wei , Imamoto Tsuneo
Published: December 2003

An intersting chiral metallohelical complex [Cd(C4H4O4)(SC(NH2)2)2]n (I) is spontaneous assembled. The formation is driven by multiple intramolecular hydrogen bond interactions to form the helical structure and by multiple intermolecular hydrogen bond interactions to form chiral supramolecular arrays.
A New Process for C–Si Bond Formation from cis-Alkyl(silyl)platinum(II) Complexes
Authors: Ozawa Fumiyuki , Kitaguchi Masaya , Katayama Hiroyuki
Published: December 2003

The complexes cis-PtR(SiHPh2)(PMe2Ph)2 (R = Me, Et, Pr, Bu) have been found to undergo two types of C–Si bond formation process. One is a novel reaction process via isomerization to cis-PtH(SiRPh2)(PMe2Ph)2, and the other is C–Si reductive elimination involving prior displacement of a PMe2Ph ligand with diphenylacetylene added to the system.
Light Fastness Properties of Acid Dye and Mesoporous Ca-Aluminosilicate Composite
Authors: Shibata Masashi , Hotta Hajime , Suzuki Toshiyuki , Valange Sabine , Gabelica Zelimir
Published: December 2003

Light-fastness properties of composites involving mesoporous Ca aluminosilicate substrates (MCM-41 structure) and acid dye (Lithol Rubine B) were examined. High surface area Al-MCM-41 materials synthesized in the presence of Ca2+ ions yielded the dye composites with the highest light fastness qualities, when compared to Ca2+ ion-exchanged Al-MCM-41 aluminosilicates, to non composite pigment or to smectite - dye composites.
Improvement of Both the Acidity and Stability of MCM-41 by Post-synthesis Alumination
Authors: Shen S-C , Kawi S
Published: December 2003

Post-synthesis alumination of MCM-41 is found to substantially enhance the material’s: (1) surface acidity, by increasing its number of Lewis and Brønsted acid sites; (2) physical stability, by improving its hydrothermal stability in boiling water and in high-temperature steam; (3) mechanical stability, by minimizing the collapse of its mesopores under high pressure compression; and (4) chemical stability, by improving its resistance in high pH aqueous solution.
Electrochemical Deposition of Films of p-Doped Regioregular Poly(3-hexylthiophene-2,5-diyl)
Authors: Yamamoto Takakazu , Kokubo Hisashi
Published: December 2003

Electrochemically oxidative deposition of regioregular poly(3-hexylthiophene-2,5-diyl) gave a film in which p-doped polymer molecules took an ordered structure. According to the p-doping, the ordered structure of the neutral original polymer in the solid was changed. Conditions for the preparation of the film and electrically conducting properties of the film are described.
Domino Oxidation of Ladder Oligosilanes: Formation of Novel Ladder Frameworks Containing Oligosiloxane and Oligosilane Chains
Authors: Kyushin Soichiro , Tanaka Ryoji , Arai Kuniaki , Sakamoto Azusa , Matsumoto Hideyuki
Published: December 2003

The domino oxidation predominates in the tri-, tetra-, and penta-oxidations of tricyclic, tetracyclic, and pentacyclic ladder oligosilanes 5, 7, and 9 with m-chloroperoxybenzoic acid. The structures of these products were determined by X-ray crystallography. The resulting domino oxidation products 6, 8, and 10 show intense absorption bands in the UV spectra.
Dimerization of Ethynylcyclopentadienylmetal Complexes
Authors: Suzuki Yasunobu , Hirotani Ryuichi , Komatsu Hiroaki , Yamazaki Hiroshi
Published: December 2003

Heating of bulky ethynyltetramethylcyclopentadienylmetal complexes, RC≡CH (R = Me4C5Rh(cod), Me4C5Ir(cod), Me4C5Fe(C5Me4H)), in the presence of catalytic amounts of Ru(H)2(CO)(PPh3)3 afforded the corresponding butatriene, RCH=C=C=CHR. The rhodium complex was stepwise hydrogenated by Ru(H)2(CO)(PPh3)3 to give a butadiene complex, RCH=CH–CH=CHR, whose molecular structure was determined by X-ray diffraction analysis.