Wolfram W. Rudolph、Cory C. Pye2000-02-05The Journal of Physical Chemistry A
We have shown that Sc(III) in aqueous perchlorate solution occurs as a hexaaqua cation. The weak, polarized Raman band assigned to the ν 1 (a 1g )(ScO 6 ) mode of the hexaaqua Sc(III) ion has been studied as a function of concentration. Besides the isotropic component at 442 cm -1, two weak depolarized modes at 295 an…
Spectroscopy and Quantum Chemical StudiesSolid-state spectroscopy and crystallographyChemical Synthesis and Characterization
Jiang‐Dong Tong、Robert Jérôme2000-02-05Macromolecules
peer reviewed
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesElasticity and Material Modeling
Mutsumi Kimura、Tsuyoshi Muto、Hideaki Takimoto 等 8 位作者2000-02-05Langmuir
A family of copper and zinc phthalocyanine-based amphiphililes possessing racemic and optically active diol units, ( rac )-ZnPc(OH) 16, ( rac )-CuPc(OH) 16, and ( S )-CuPc(OH) 16, have been synthesized. The self-assembling properties of these amphiphiles in aqueous solution have been studied by UV−vis, Fourier transfo…
Molecular Sensors and Ion DetectionSupramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine Chemistry
Mher M. Aghasyan、Samvel M. Badalyan、Garnett W. Bryant2000-02-05arXiv
A theory for the relaxation rates of a test electron and electron temperature in quantum wires due to deformation, piezoelectric acoustical and polar optical phonon scattering is presented. We represent intra- and inter-subband relaxation rates as an average of rate kernels weighted by electron wave functions across a…
Materials Science
Julio Buey、Timothy M. Swager2000-02-04Angewandte Chemie
Die sequentielle Polymerisation von supramolekularen Metallorotaxankomplexen führt zu dreisträngigen leitfähigen Polymeren. Dabei ist der innere Polymerstrang so zwischen den beiden anderen eingebunden, dass er als molekularer Draht vorliegt, der effektiv isoliert ist, wenn sich die äußeren Polymerstränge im nicht lei…
Conducting polymers and applicationsPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials
Rebecca Green、Siska Corneillie、Justine Davies 等 8 位作者2000-02-04Langmuir
We report on the study of the hydration of a series of poly(ether urethanes) of varying poly(ethylene oxide) content within their soft segments using surface plasmon resonance (SPR). The study of the extent and dynamics of polymer film swelling upon hydration by SPR reveals that the technique is sensitive to the influ…
Surface Modification and SuperhydrophobicityPolymer Surface Interaction StudiesForce Microscopy Techniques and Applications
Xinghua Liu、C. M. Chun、İlhan A. Aksay 等 4 位作者2000-02-04Industrial & Engineering Chemistry Research
Mesostructured nickel oxide was formed with nickel sulfate and cationic surfactant cetyltrimethylammonium bromide (CTAB). X-ray diffraction (XRD) peaks at low scattering angles and transmission electron microscopy (TEM) indicated that a mesostructure was formed. However, these XRD patterns disappeared after calcinatio…
Supercapacitor Materials and FabricationCatalytic Processes in Materials ScienceMesoporous Materials and Catalysis
Chia-Ying Wang、M. D. Ediger2000-02-04The Journal of Physical Chemistry B
A photobleaching technique has been used to measure the translational motion of tetracene in polystyrene near T g . The intermediate scattering function S ( q, t ) was observed to become increasingly non-exponential with decreasing temperature. Thus a clear transition from Fickian diffusion to non-Fickian translationa…
Phase Equilibria and ThermodynamicsMaterial Dynamics and PropertiesTheoretical and Computational Physics
Hans‐Jürgen Eisler、Stefan Gilb、Frank Hennrich 等 4 位作者2000-02-04The Journal of Physical Chemistry A
Raman measurements and PM3 calculations of low frequency (<600 cm - ) vibrational modes in a variety of different fullerenes can be rationalized in terms of the multipolar “acoustic” oscillations of isotropic spherical and spheroidal shells. In this first of a two part series, we show that all fullerene cages have mon…
Carbon Nanotubes in CompositesFullerene Chemistry and ApplicationsMechanical and Optical Resonators
Mahn-Jong Kim、Frederick M. MacDonnell、Mary E. Gimon-Kinsel 等 6 位作者2000-02-04Angewandte Chemie International Edition
Metallodendrimers with ten chiral Ru centers have been prepared in a stereospecific fashion (see picture; *=chiral Ru(diimine)(3) center). These molecules are conformationally rigid and exhibit well-defined global topologies: some diastereomers exhibit macroscopically chiral structures, others show a disklike topology…
Metal complexes synthesis and propertiesDNA and Nucleic Acid ChemistryDendrimers and Hyperbranched Polymers
L. Allouche、Corine Gérardin、Thierry Loiseau 等 5 位作者2000-02-04Angewandte Chemie
Durch einfache hydrothermale Umsetzung des bekannten Aluminiumpolykations ε-Al13 erhält man die schematisch gezeigte, neuartige Al30-Spezies, das bislang größte Polykation. Dessen Charakterisierung durch Röntgenbeugungs- und NMR-Messungen ermöglichte auch die Zuordnung einiger bis dahin nicht identifizierter Signale i…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsChemical Synthesis and Characterization
Akihiko Tsuda、Aiko Nakano、Hiroyuki Furuta 等 5 位作者2000-02-04Angewandte Chemie
Niedrigere Oxidationspotentiale als die monomeren Ausgangsverbindungen weisen die durch Ein-Elektronen-Oxidation mit Tris(4-bromphenyl)ammoniumhexachloroantimonat erhaltenen Diporphyrine [siehe z. B. Gl. (1)] auf. Dies und die stark rotverschobenen Soret-Banden der Produkte wiesen auf eine hohe Elektronenbeweglichkeit…
Porphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent MaterialsMetal-Catalyzed Oxygenation Mechanisms
Lin X. Chen、W. Jäger、David J. Gosztola 等 5 位作者2000-02-04The Journal of Physical Chemistry B
The effects of metal ion chelation to the 2,2‘-bipyridine (bpy) groups on the photophysics and exciton dynamics of two conjugated polymers 1 and 2 in solution are investigated. The structures of polymers 1 and 2 have 2,2‘-bipyridyl-5-vinylene units that alternate with one and three 2,5-bis( n -decyloxy)-1,4-phenylenev…
Organic Electronics and PhotovoltaicsOrganic Light-Emitting Diodes ResearchConducting polymers and applications
Mao-Chun Hong、Weiping Su、Rong Cao 等 5 位作者2000-02-04Chemistry - A European Journal
The new versatile multidentate nonchelating ligand 1,2-bis[(2-pyr-imidinyl)-sulfanylmethyl]benzene (bpsb) was designed and prepared for supramolecular syntheses. Self-assembly between silver nitrate and the bpsb ligand resulted in the polymer [Ag4(bpsb)2-(NO3)4]n (1) with a single-stranded helical chain structure. Eac…
Metal-Organic Frameworks: Synthesis and ApplicationsSupramolecular Self-Assembly in MaterialsNanocluster Synthesis and Applications
J. A. Alonso、Jesús Sanz、J. Santamarı́a 等 6 位作者2000-02-04Angewandte Chemie
Lithiumionen befinden sich in der Mitte der Sauerstoff-„Fenster”︁ im Gerüst der eckenverknüpften TiO6-Oktaeder der Titelverbindung (siehe Bild), wie durch Neutronenbeugung gezeigt werden konnte. Die interatomaren Abstände werden dadurch optimiert, dass die Oktaeder etwas geneigt sind. Die ungewöhnliche Koordination un…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisNuclear materials and radiation effects
Ian Rose、Norman Epstein、A. P. Watkinson2000-02-04Industrial & Engineering Chemistry Research
Experiments on acid- (HCl-) catalyzed thermal decomposition of 2-furaldehyde in a dilute aqueous solution were performed in a stainless steel batch reactor over a temperature range of 130−170 °C. First-order reaction kinetics best described the experimental results. The rate of reaction increased with temperature and…
Catalysis for Biomass ConversionCatalysis and Hydrodesulfurization StudiesThermal and Kinetic Analysis
Franz‐Peter Montforts、Olaf Kutzki2000-02-04Angewandte Chemie International Edition
To model the photosynthetic reaction center, the chlorin - fullerene dyad 1 was synthesized in a one-pot reaction from a linear tetrapyrrole and C(60). It is the first dyad of this type which contains a fullerene and a chlorin unit, the chromophore of naturally occurring photosynthetic systems.
Porphyrin and Phthalocyanine ChemistryChemical Reactions and MechanismsHistory and advancements in chemistry
Won‐Ki Lee、Joseph A. Gardella2000-02-04Langmuir
The rate of hydrolysis of Langmuir monolayer films of a series of biodegradable polyesters was investigated at the air/water interface. The present study investigated parameters such as degradation medium, pH, and time. The hydrolysis of polyester monolayers strongly depended on both the degradation medium used to con…
biodegradable polymer synthesis and propertiesMicroplastics and Plastic PollutionPolymer Surface Interaction Studies
C. N. Rusu、John T. Yates2000-02-04The Journal of Physical Chemistry B
The photodecomposition of chemisorbed NO has been studied using ultraviolet radiation of (3.96 ± 0.07) eV. Both the TiO 2 (110) single-crystal substrate and high area compressed TiO 2 powders have been investigated. A primary photoproduct is N 2 O gas, which desorbs immediately upon irradiation of the TiO 2 (110) surf…
Advanced Photocatalysis TechniquesCatalytic Processes in Materials ScienceGas Sensing Nanomaterials and Sensors
Luigi Cavallo、Heiko Jacobsen2000-02-04Angewandte Chemie International Edition
Insight into the controversial mechanism of the Mn - salen-catalyzed epoxidation of olefins is provided in a theoretical study based on density functional theory. The calculations suggest that radical species A, but not manganaoxetanes B, are likely candidates for viable intermediates.
Polyoxometalates: Synthesis and ApplicationsMetal-Catalyzed Oxygenation MechanismsOxidative Organic Chemistry Reactions