Anne Dolbecq、A. Guirauden、Marc Fourmigué 等 10 位作者1999-01-01Journal of the Chemical Society Dalton Transactions
Electrocrystallization of three hydroxylated donor molecules derived from tetrathiafulvalene (TTF) or ethylenedithiotetrathiafulvalene (EDT-TTF), i.e. Me3TTF-CH2OH, EDT-TTF(CH2OH)2 and TTF(CH2OH)4, in the presence of [n-Bu4N+]2[Mo6O19]2– afforded 2∶1 cation radical salts, [donor+˙]2[Mo6O19]2–, whose crystal structures…
Magnetism in coordination complexesPolyoxometalates: Synthesis and ApplicationsVanadium and Halogenation Chemistry
A. Ochse、A. Kettner、Jörg Kopitzke 等 5 位作者1999-01-01Physical Chemistry Chemical Physics
The hole transport properties of ester substituted hexaalkyloxytriphenylenes are investigated and compared with the materials without ester substituents. The high hole mobilities of the recently investigated discotic liquid crystals of the hexaalkyloxytriphenylene-type are restricted to the very small temperature rang…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsPhotochemistry and Electron Transfer Studies
Nobuo Tajima、Masaki Hashimoto、Fuminori Toyama 等 5 位作者1999-01-01Physical Chemistry Chemical Physics
The catalysis of Cu-exchanged zeolite for the direct decomposition of nitric oxide was investigated by hybrid density functional theory (B3LYP) using a molecular model of the active site. For reactions of two NO molecules over a Cu ion bound to the zeolite model (ZCu), the structures and energies of adsorption complex…
Metal-Organic Frameworks: Synthesis and ApplicationsCatalytic Processes in Materials ScienceAmmonia Synthesis and Nitrogen Reduction
Siu‐Choon Ng、Jingmei Xu、Hardy Sze On Chan 等 5 位作者1999-01-01Journal of Materials Chemistry
A novel regioregular polymer comprising alternating 1,4-phenylene and 3-butyl-2,5-thienylene repeat units has been synthesized and characterized using 1 H NMR, FTIR, UV-VIS absorption and fluorescence emission spectroscopy. The derived polymer showed strong fluorescence with a solution quantum yield of 48% relative to…
Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchConducting polymers and applications
Bruno Améduri、Bernard Boutevin、Georges Kostov 等 4 位作者1999-01-01Designed Monomers & Polymers
The synthesis of novel perfluorovinyl thioacetoxy monomer (FSAc) and its copolymerization with vinylidene fluoride (VDF; also called 1,1-difluoroethylene) are presented. This monomer was obtained in good yield from the photochemical addition of thiol acetic acid to 1,1,2-trifiuoro-1,4-pentadiene. It was first hydrolyz…
Fluorine in Organic ChemistrySynthesis and properties of polymersSilicone and Siloxane Chemistry
Henry Krakauer、Rici Yu、Chengzhang Wang 等 5 位作者1999-01-01Journal of Physics Condensed Matter
Molecular dynamics simulations of the perovskite oxide KNbO 3 are performed with a first-principles effective Hamiltonian. They reveal the prevalence of local polar distortions with short-range chain-like correlations, present even in the paraelectric phase far above T c . The ordering of these dynamically fluctuating…
Ferroelectric and Piezoelectric MaterialsGlass properties and applicationsPhotorefractive and Nonlinear Optics
Czesław Rudowicz、S. B. Madhu1999-01-01Journal of Physics Condensed Matter
Several sets of non-standard zero-field splitting (ZFS) parameters in the spin Hamiltonian (SH) for transition-metal ions at orthorhombic or lower symmetry sites in various crystals have been revealed by a recent literature survey. The standardization limits the ratio of the orthorhombic ZFS parameters: (conventional)…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesInorganic Chemistry and Materials
Simon Krijnen、Barbara L. Mojet、Hendrikus C. L. Abbenhuis 等 5 位作者1999-01-01Physical Chemistry Chemical Physics
This paper describes a spectroscopic study of the heterogenisation of a novel liquid-phase epoxidation catalyst, a titanium(IV) silsesquioxane complex. Its immobilisation is performed exclusively via a straightforward adsorption of the homogeneous catalyst, i.e. the metal complex, in the pores of an MCM-41 host materi…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsSilicone and Siloxane Chemistry
M.A. McDonough、Herbert E. Klei、Judith A. Kelly1999-01-01Protein Science
Penicillin G acylase is an important enzyme in the commercial production of semisynthetic penicillins used to combat bacterial infections. Mutant strains of Providencia rettgeri were generated from wild-type cultures subjected to nutritional selective pressure. One such mutant, Bro1, was able to use 6-bromohexanamide…
Enzyme Catalysis and ImmobilizationEnzyme Structure and FunctionBiochemical and Molecular Research
Achim Müller、Samar K. Das、Hartmut Bögge 等 5 位作者1999-01-01Chemical Communications
The reaction of an aqueous solution of sodium molybdate with hypophosphorous (phosphinic) acid acting both as reducing agent and ligand at low pH values (≈1) results in the formation of nanosized ring-shaped cluster units which assemble to form layers of the compound Na21[MoVI126- MoV28O462H14(H2O)54(H2PO2)7]·xH2O 1 (…
Polyoxometalates: Synthesis and ApplicationsNanocluster Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
A. Mekhaldi、D. Namane、S. Bouazabia 等 4 位作者1999-01-01IEEE Transactions on Dielectrics and Electrical Insulation
This paper deals with discontinuous pollution layers deposited on the insulator surface. Two zones are known to form: a clean (dry) zone and a polluted (wetted) zone. The influence of the length and position of the dry zone on the leakage current and the arc length are investigated. These were made on a plane experime…
High voltage insulation and dielectric phenomenaLightning and Electromagnetic PhenomenaElectrostatic Discharge in Electronics
Michiel C. A. van Vliet、Isabel W. C. E. Arends、Roger A. Sheldon1999-01-01Chemical Communications
Perfluoroheptadecan-9-one is a selective and mild catalyst for the epoxidation of a wide variety of alkenes with hydrogen peroxide; after the reaction the catalyst can be easily recovered and reused without noticable decomposition.
Porphyrin and Phthalocyanine ChemistryPolyoxometalates: Synthesis and ApplicationsOxidative Organic Chemistry Reactions
Alessandra Molinari、Rossanno Amadelli、Leonardo Andreotti 等 4 位作者1999-01-01Journal of the Chemical Society Dalton Transactions
Hetrogenisation of H3PW12O40 and (nBu4N)4W10O32 with silica provides new photocatalytic systems able to oxygenate cyclohexane with O2 without causing the oxidative mineralization process which typically occur on the surface of the photosensitive semiconductor TiO2.
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsAdvanced Nanomaterials in Catalysis
Benjamin J. Coe、J. Arthur Harris、Inge Asselberghs 等 8 位作者1999-01-01Journal of the Chemical Society Dalton Transactions
The ligands N-methyl-2,7-diazapyrenium (Medap+), N-(2-pyrimidyl)-4,4′-bipyridinium (PymQ+), N-methyl-4-[trans-2-(4-pyridyl)ethenyl]pyridinium (Mebpe+) and N-phenyl-4-[trans-2-(4-pyridyl)ethenyl]pyridinium (Phbpe+) have been used to prepare a series of complex salts trans-[RuII(NH3)4(LD)(LA)][PF6]3 [LD = NH3 and LA = M…
Metal complexes synthesis and propertiesPorphyrin and Phthalocyanine ChemistryNonlinear Optical Materials Research
Zhang Qiwu、Fumio Saito、Kaoru Shimme 等 4 位作者1999-01-01Journal of the Society of Powder Technology Japan
Room-temperature dechlorination process for polyvinyl chloride (PVC) has been developed. The process employs a mechanochemical (MC) treatment of PVC and CaO mixture followed by washing of mixture with water. MC reaction between PVC and CaO was induced by the treatments with a planetary mill and a new type of mill name…
Environmental remediation with nanomaterialsPolymer Science and PVC
Adam Hilton、Thierry Renouard、Olivier Maury 等 6 位作者1999-01-01Chemical Communications
The synthesis and optical properties of 4,4′-bis(dialkylaminophenylazo)-2,2′-bipyridine and 4,4′-bis(dialkylaminophenylimino)-2,2′-bipyridine ligands are described; the corresponding dipolar bipyridyl zinc dichloride complexes have been prepared and their second order nonlinear optical properties determined by electri…
Porphyrin and Phthalocyanine ChemistryNonlinear Optical Materials ResearchPhotochemistry and Electron Transfer Studies
Mike Lazell、Paul O’Brien1999-01-01Journal of Materials Chemistry
The synthesis of CdS nanocrystals has been carried out by the thermolysis of cadmium dichloride with trioctylphosphine sulfide as the sulfur source, in tri-n-octylphosphine oxide at 250 °C. The material shows quantum size effects in the optical spectrum. The onset of absorption for CdS is at ≈480 nm (bulk CdS, 515 nm)…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsCopper-based nanomaterials and applications
Gregory N. Morscher、J. Martínez‐Fernández1999-01-01Journal of the American Ceramic Society
Several different types of SiC fiber tows were coated with BN and composited using chemically vapor‐infiltrated SiC to form single‐tow minicomposites. The types of SiC fiber included Nicalon ™ , Hi‐Nicalon ™ , and the new Sylramic ™ polycrystalline SiC fiber. The interfacial shear stresses were determined from unload–…
Advanced ceramic materials synthesisMetal and Thin Film MechanicsDiamond and Carbon-based Materials Research
L. Torrisi1999-01-01PubMed
The main properties of NiTi alloys are presented, discussed and compared with respect to those of stainless steels. Special regard is given to the use of NiTi alloy as orthodontic wires and endodontic instruments. The superelastic properties of orthodontic wires and endodontic files are measured as a function of the a…
Shape Memory Alloy TransformationsAdvanced X-ray and CT ImagingElectronic and Structural Properties of Oxides
Pramod Kumar Sharma1999-01-01Electrochemical and Solid-State Letters
Cobalt can be doped into the layered alkali manganese dioxides, M x Mn 1 − y Co y O 2 for M = K or Na , during the hydrothermal synthesis from the alkali permanganates. A single phase is obtained up to about 5 % mol cobalt. The cobalt doping is found to enhance the conductivity by two orders of magnitude relative to p…
Advancements in Battery MaterialsSupercapacitor Materials and FabricationAdvancements in Solid Oxide Fuel Cells