Joan Ribas、Belén Albela、H. Stoeckli‐Evans 等 4 位作者1997-05-01Inorganic Chemistry
The reaction of N-n-Bu(4)MnO(4) or NaMnO(4) with appropriate reagents in ethanol-pyridine leads to the high-yield formation of new mixed-valence trinuclear oxo-centered Mn(III,III,II) complexes of general formulation [Mn(3)O(X-benzoato)(6)L(3)] (1, X = 2-fluoro, L = pyridine; 2, X = 2-chloro, L = pyridine; 3, X = 2-br…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesMetal-Catalyzed Oxygenation Mechanisms
Mark Baker、Peter Hammer1997-05-01Surface and Interface Analysis
The chemical composition and microstructure of dual ion beam-deposited CNx films with nitrogen contents in the range 20–33 at.% have been examined by Fourier transform infrared spectroscopy (FTIR) and x-ray photoelectron spectroscopy (XPS). The FTIR spectra together with other published data have been used to construc…
Metal and Thin Film MechanicsDiamond and Carbon-based Materials ResearchIon-surface interactions and analysis
David L. Price、Adam J. Ellison、Marie‐Louise Saboungi 等 6 位作者1997-05-01Physical review. B, Condensed matter
The origin of diffraction peaks observed at low wave vector in many complex glasses remains a central issue in the understanding of amorphous structures. In this work a combination of neutron and x-ray diffraction is used to correlate the contributions from the different atom pair correlations to such peaks in rubidiu…
Material Dynamics and PropertiesGlass properties and applicationsPhase-change materials and chalcogenides
Daniel H. Rapoport、W. Vogel、Helmut Cölfen 等 4 位作者1997-05-01The Journal of Physical Chemistry B
Ligand-stabilized gold clusters may serve as model catalysts, and the packing of their gold atoms is therefore of great interest. The cluster of the stoichiometry Au 55 [P(C 6 H 5 ) 3 ] 12 Cl 6 is thought to be the smallest known defined compound in which the gold maintains a cubic dense packed metallic (ccp) state. W…
Organometallic Complex Synthesis and CatalysisNanocluster Synthesis and ApplicationsInorganic Chemistry and Materials
Bakthavatsalam Sundararaju、Alfred A. Antson、Robert S. Phillips 等 8 位作者1997-05-01Biochemistry
The X-ray structure of tyrosine phenol-lyase (TPL) complexed with a substrate analog, 3-(4'-hydroxyphenyl)propionic acid, shows that Arg 381 is located in the substrate binding site, with the side-chain NH1 4.1 A from the 4'-OH of the analog. The structure has been deduced at 2.5 A resolution using crystals that belon…
Enzyme Structure and FunctionAmino Acid Enzymes and MetabolismCancer Research and Treatments
Yasuhisa Kuroda、Ayato Kawashima、Yuichirou Hayashi 等 4 位作者1997-05-01Journal of the American Chemical Society
Complex formation between pyrazine derivatives and dimeric self-assembly of αααα-isomer of meso -tetrakis(2-carboxy-4-nonylphenyl)porphyrin Zn complex ( 1·Zn ) was investigated. Thermal atropisomerization of 1·Zn in a nonpolar solvent such as toluene gives the αααα-atropisomer exclusively. Vapor pressure osmometry for…
Molecular Sensors and Ion DetectionSupramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine Chemistry
William F. Schneider、K. C. Hass、Rampi Ramprasad 等 4 位作者1997-05-01The Journal of Physical Chemistry B
First-principles quantum calculations are potentially of great value for assessing the plausibility of proposed catalytic reaction mechanisms. The present analysis of reaction pathways and energetics for key elementary steps in the catalytic decomposition of NO to N 2 + O 2 by Cu-exchanged zeolites yields novel insigh…
Advanced Chemical Physics StudiesCatalytic Processes in Materials ScienceAmmonia Synthesis and Nitrogen Reduction
D. R. Rainer、Chenyu Xu、P. M. Holmblad 等 4 位作者1997-05-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
The chemisorptive behavior of CO on several planar model monometallic and bimetallic Pd, Cu, and Au catalysts supported on thin film Al2O3 has been investigated using infrared reflection absorption spectroscopy (IRAS). For Pd and Cu monometallic catalysts, CO adsorption spectra indicate a high representation of low in…
Advanced Chemical Physics StudiesCatalytic Processes in Materials Sciencenanoparticles nucleation surface interactions
Ralph-Dieter Maier、Ralf Thomann、J�rg Kressler 等 5 位作者1997-05-01Journal of Polymer Science Part B Polymer Physics
The melt miscibility of atactic poly(propylene) (a-PP) with isotactic (i-PP) and syndiotactic poly(propylene) (s-PP), respectively, is investigated by diffusion experiments of i-PP/a-PP/i-PP or s-PP/a-PP/s-PP sandwich specimens using polarized light microscopy. It is shown that the system a-PP/i-PP is miscible in the…
Organometallic Complex Synthesis and CatalysisPolymer crystallization and propertiesMaterial Dynamics and Properties
D. N. Argyriou、J. F. Mitchell、C. D. Potter 等 6 位作者1997-05-01Physical review. B, Condensed matter
The crystal structure of ${\mathrm{La}}_{1.2}$${\mathrm{Sr}}_{1.8}$${\mathrm{Mn}}_{2}$${\mathrm{O}}_{7}$ has been determined as a function of temperature in magnetic fields of 0 and 0.6 T. There is a significant magnetostriction at the Curie temperature ${\mathrm{T}}_{\mathrm{C}}$; the a axis contracts (\ensuremath{\D…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Dennis P. Arnold、David A. James1997-05-01The Journal of Organic Chemistry
Porphyrin dimers linked in the meso -positions by bridges containing alkynes conjugated with the porphyrin π-systems display highly perturbed electronic absorption spectra. We have prepared a series of such dimers using meso -ethynyl nickel(II) octaethylporphyrin as the primary building block. The bridging units inclu…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesMetal-Catalyzed Oxygenation Mechanisms
Yiping Zhang、Pamela J. Zapf、Linda M. Meyer 等 5 位作者1997-05-01Inorganic Chemistry
The hydrothermal reactions of vanadium oxide and molybdenum oxide starting materials with divalent first-row transition metal cations in the presence of nitrogen donor chelating ligands yield the heterometallic hexanuclear clusters [{Zn(bipy)(2)}(2)V(4)O(12)] (2), [{Zn(phen)(2)}(2)V(4)O(12)].H(2)O (3.H(2)O), and [{Ni(…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
Michele Laus、A. S. Angeloni、Oriano Francescangeli 等 5 位作者1997-05-01Macromolecular Symposia
Abstract The peculiar liquid crystalline behavior of two poly(urethane‐ester)s TDI‐C6C4 and TDI‐C6C8 is reported. Evidence is provided of the formation of two nematic mesophases, a cybotactic nematic and a conventional nematic mesophase, in TDI‐C6C8 and of one cybotactic nematic mesophase in TDI‐C6C4. IR spectroscopy…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsSynthesis and Properties of Aromatic Compounds
Lorna J. Gibson、Michael F. Ashby1997-05-01Cambridge University Press eBooks
Introduction and synopsis Foams can be made out of almost anything: metals, plastics, ceramics, glasses, and even composites. Their properties depend on two separate sets of parameters. There are those which describe the geometric structure of the foam – the size and shape of the cells, the way in which matter is dist…
Asphalt Pavement Performance EvaluationCellular and Composite StructuresPolymer composites and self-healing
Jens Eggers1997-05-01Physikalische Blätter
Abstract Die Wirkungsweise von Rasensprengern, Parfumzerstäubern oder Tintenstrahldruckern beruht auf der Oberflächenspannung. Diese führt dazu, daß sich ein Flüssigkeitsstrahl unter Verringerung der Oberfläche einschnürt und Tropfen bildet. In der Nähe des singulären Punktes, in dem sich ein Tropfen abtrennt, gelten…
Surface Modification and SuperhydrophobicityFluid Dynamics and Thin FilmsPlant Surface Properties and Treatments
P. Predeep、N. S. Saxena1997-05-01Physica Scripta
Thermal conductivity and thermal diffusivity of three rare earth oxide powders (Gadolinium oxide, Samarium oxide and Yttrium oxide) are measured experimentally using Transient Plane Source (TPS) technique at ambient temperature. An attempt has been made to accommodate the effect of porosity of the powders on thermal c…
Numerical methods in inverse problemsThermal properties of materialsRadiative Heat Transfer Studies
Gaboury Benoit、Tim F. Rozan、Richard April1997-05-01Soil Science Society of America Journal
Abstract Soil weathering is an important source of nutrient cations and P for development of forested ecosystems, but the rates at which these nutrients are released are not well known. Measurement of weathering products can be used in long‐term (5–10 yr) mesocosm studies to evaluate soil weathering rates. In this stu…
Geochemistry and Elemental AnalysisClay minerals and soil interactionsMine drainage and remediation techniques
Владимир И. Минкин、V. N. Komissarov1997-05-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
A new class of photochromic compounds, derivatives of 2,3-dihydro-2-spiro-4′-(2′,6′-di-tert-butylcyclohexadienon-2′,5′- one) erimidine is described and their photochromic and thermochromic rearrangements described.
Photochromic and Fluorescence ChemistryBioactive Compounds and Antitumor AgentsSynthesis of Organic Compounds
Chad R. Snyder、Hervé Marand1997-05-01Macromolecules
A previous study (Snyder, C. R.; Marand, H.; Mansfield, M. L. Macromolecules 1996, 29, 7508) by the authors suggested that, within the context of the Lauritzen−Hoffman secondary surface nucleation theory, the apportionment factor for the free energy of crystallization (ψ LH ) and the retardation factor due to transpor…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesRheology and Fluid Dynamics Studies
Peter A. Tanner、Xia Shangda、Liu Yu-long 等 4 位作者1997-05-01Physical review. B, Condensed matter
Raman spectra have been recorded from 300--10 K for lanthanide hexachloroelpasolites, ${\mathrm{Cs}}_{2}$${\mathrm{NaLCl}}_{6}$. Electronic Raman-scattering intensity ratios have been calculated using Judd-Ofelt-Axe theory and are in reasonable agreement with experimental results, except for those cases where electron…
Glass properties and applicationsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography