Ming Li、Didier Bonnet、Eckhard Bill 等 8 位作者2002-05-31Inorganic Chemistry
Two new pentadentate, pendent arm macrocyclic ligands of the type 1-alkyl-4,7-bis(4-tert-butyl-2-mercaptobenzyl)-1,4,7-triazacyclononane where alkyl represents an isopropyl, (L(Pr))(2-), or an ethyl group, (L(Et))(2-), have been synthesized. It is shown that they bind strongly to ferric ions generating six-coordinate…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Timothy D. Lash、Michael Hayes、John D. Spence 等 6 位作者2002-05-31The Journal of Organic Chemistry
The "3 + 1" variant of the MacDonald condensation has been shown to be an excellent methodology for synthesizing carbaporphyrins. In particular, 1,3-indenedicarbaldehyde condenses with tripyrranes in the presence of TFA to give, following oxidation with DDQ, a series of benzocarbaporphyrins in excellent yields. Trifor…
Molecular Sensors and Ion DetectionPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials
Matthias Brünner、Clemens Bechinger2002-05-31Physical Review Letters
We investigate the melting process of a two-dimensional charge-stabilized colloidal system in the presence of a triangular substrate potential. This potential is formed by an optical interference pattern that allows the substrate strength to be varied continuously. By means of an additional scanned optical tweezer the…
Material Dynamics and PropertiesSpectroscopy and Quantum Chemical StudiesPickering emulsions and particle stabilization
Murali Sastry、Mala Rao、Krishna N. Ganesh2002-05-31Accounts of Chemical Research
The controlled assembly of nanoparticles in thin film form on solid supports, both as monolayers and as superlattice structures, is a problem of considerable topical interest. Among the many interactions used to program the assembly of nanoparticles, electrostatic forces are particularly interesting for many reasons.…
Gold and Silver Nanoparticles Synthesis and ApplicationsQuantum Dots Synthesis And PropertiesMolecular Junctions and Nanostructures
Andreas Heuer、Magnus Kunow、M. Vogel 等 4 位作者2002-05-31Physical Chemistry Chemical Physics
We present results of molecular dynamics simulations on lithium metasilicate over a broad range of temperatures for which the silicate network is frozen but the lithium ions can still be equilibrated. The lithium dynamics is studied via the analysis of different correlation functions. The activation energy for the lit…
Material Dynamics and PropertiesGlass properties and applicationsTheoretical and Computational Physics
Yurii A. Teterin、A. Yu. Teterin2002-05-31Russian Chemical Reviews
The results of the X-ray photoelectron spectroscopy studies of the electronic structures of trifluorides, oxides and other compounds of Sc, Y and lanthanides (Ln) from La to Lu, except for Pm, in the binding energy range from 0 to 1350 eV are generalised. The established dependences of the Ln4f binding energies and th…
Advanced Chemical Physics StudiesElectron and X-Ray Spectroscopy TechniquesInorganic Fluorides and Related Compounds
L. E. Muzzy、M. Avdeev、G. Lawes 等 8 位作者2002-05-31arXiv
The structure and physical properties of the Zr-stabilized, nonstoichiometric molybdenum diboride superconductor are reported. Good quality material of the diboride structure type can only be obtained by partial substitution of Zr for Mo, and the quenching of melts. The phase is best made with boron in excess of the i…
Materials ScienceSuperconductivity
Cai‐Ming Liu、Deqing Zhang、Ming Xiong 等 4 位作者2002-05-31Chemical Communications
A heterometallic polyoxometalate [Co(en)2][Co(bpy)2]2[PMoVI5MoV3VIV8O44]·4.5H2O (en = ethylenediamine, bpy = 2,2′-bipyridine) 1, has been hydrothermally synthesized, which is the first example of a two-dimensional framework where polyoxometalate anions are linked by two types of complex fragments.
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsCovalent Organic Framework Applications
Frédéric Barrière、Nicole Camire、William E. Geiger 等 5 位作者2002-05-31OpenAlex
The redox potentials of bis(fulvalene)dinickel, 1, and the tetrakis(ferrocenyl)nickel dithiolene complex 2 have been measured in a variety of nonaqueous electrolytes. The difference in E1/2 values of the two successive one-electron oxidations of 1 (i.e., DeltaE1/2 values) increased from a low of 212 mV in anisole/[NBu…
Molecular Junctions and NanostructuresOrganic and Molecular Conductors ResearchCO2 Reduction Techniques and Catalysts
Hiroyuki Kono、Shunji Yunoki、Tamio Shikano 等 6 位作者2002-05-31OpenAlex
The precise assignments of cross polarization/magic angle spinning (CP/MAS) (13)C NMR spectra of cellulose I(alpha) and I(beta) were performed by using (13)C labeled cellulose biosynthesized by Acetobacter xylinum (A. xylinum) ATCC10245 strain from culture medium containing D-[1,3-(13)C]glycerol or D-[2-(13)C]glucose…
Biofuel production and bioconversionAdvanced Cellulose Research Studies
Adam Kaminski、S. Das Sarma2002-05-31arXiv
We theoretically study the development of spontaneous magnetization in diluted magnetic semiconductors as arising from a percolation of bound magnetic polarons. Within the framework of a generalized percolation theory we derive analytic expressions for the Curie temperature and the magnetization in the limit of low ca…
ZnO doping and propertiesTheoretical and Computational PhysicsMagnetic and transport properties of perovskites and related materials
Frank V. Schindler、Howard J. Woodard、James J. Doolittle2002-05-30Communications in Soil Science and Plant Analysis
Understanding factors that affect the potassium (K) status of soil is important to chemical prediction of plant-available K in corn (Zea mays L.). Soils vary widely in their ability to replenish labile K from nonlabile forms. No research has been done to investigate the effects clay fraction mineralogy of South Dakota…
Soil and Unsaturated FlowSoil Geostatistics and MappingClay minerals and soil interactions
Takehiko Uno、Satoru Noge2002-05-30Japanese Journal of Applied Physics
This paper presents piezoelectricity in germanium-doped silica (germanosilicate) films produced by poling treatment. The germanosilicate films were prepared on Si substrates by RF magnetron sputtering. The films were poled by electric fields of 2–4 ×10 7 V/m at a temperature above 300°C. Before the poling, no piezoele…
Advanced Fiber Optic SensorsGlass properties and applicationsAcoustic Wave Resonator Technologies
Timm Höhr、P. Pendzig、W. Dieterich 等 4 位作者2002-05-30Physical Chemistry Chemical Physics
The electrical response of defect centres, which are distributed randomly in space and interact via electrostatic forces, is examined by Monte Carlo simulation of dipolar lattice gas models. Coulomb interactions are found to have a profound influence on the a.c. conductivity or the dielectric loss spectrum, when the i…
High-pressure geophysics and materialsMaterial Dynamics and PropertiesTheoretical and Computational Physics
Teruyuki Kozuka、Shin-ichi Hatanaka、Kyuichi Yasui 等 5 位作者2002-05-30Japanese Journal of Applied Physics
This paper describes a method of simultaneously executing both observations using a charge-coupled device (CCD) camera with stroboscopic light and measurement of bubble radius with light scattering. This optical system consists of a beam splitter inserted between a lens and the CCD camera, and a photomultiplier tube (…
Fluid Dynamics and MixingUltrasound and Cavitation PhenomenaNuclear Physics and Applications
Lei Rong、Keiji Yasuda、Yoshiyuki Bando 等 4 位作者2002-05-30Japanese Journal of Applied Physics
The ultrasonic decomposition of a mixture of two hydrophilic organic compounds, phenol and p -chlorophenol, in aqueous solution was investigated. The effect of the initial concentration of phenol and p -chlorophenol on the overall decomposition rate was examined experimentally. The overall decomposition rate constant…
Advanced oxidation water treatmentUltrasound and Cavitation Phenomena
Amy E. Eichstadt、T. C. Ward、Melanie D. Bagwell 等 6 位作者2002-05-30Journal of Polymer Science Part B Polymer Physics
Abstract High molecular weight, soluble, amorphous, partially aliphatic polyimides were successfully synthesized using an ester acid high‐temperature solution imidization route, which allows one to control desired glass‐transition ( T g ) and processing temperatures. This method involves the prereaction of aromatic di…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersSilicone and Siloxane Chemistry
P. Patrı́cio、M. M. Telo da Gama、S. Dietrich2002-05-30Physical Review Letters
We study geometrically controlled twist transitions of a nematic confined between a sinusoidal grating and a flat substrate. In these cells, the transition to the twisted state is driven by surface effects. We have identified the mechanisms responsible for the transition analytically and used exact numerical calculati…
Liquid Crystal Research AdvancementsNonlinear Dynamics and Pattern FormationAdvanced Materials and Mechanics
Hua Jiang、Suk Joong Lee、Wenbin Lin2002-05-30Organic Letters
[structure: see text] New chiral terpyridines containing Frechét-type dendrons have been readily synthesized by coupling dendritic benzyl bromide and 4'-[6-(2,2'-dihydroxy-1,1'-binaphthyl)]-2,2':6'2' '-terpyridine. These chiral dendritic terpyridines were used to efficiently construct high molecular weight hybrid meta…
Metal-Organic Frameworks: Synthesis and ApplicationsAdvanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched Polymers
Rawiwun Kaewamatawong、Kittisak Likhitwitayawuid、Nijsiri Ruangrungsi 等 6 位作者2002-05-30Journal of Natural Products
Two new biflavonoids, namely, 6'"-hydroxylophirone B (1) and 6'"-hydroxylophirone B 4"'-O-beta-glucoside (2), were isolated from the stem bark of Ochna integerrima, together with five known compounds. The structures of 1 and 2 were determined by spectral data interpretation.
Inorganic and Organometallic ChemistryBiological Activity of Diterpenoids and BiflavonoidsPolymer Synthesis and Characterization