Knut Wassermann、Hans‐Joachim Lunk、Rosemarie Palm 等 7 位作者1996-01-01Inorganic Chemistry
The previously unknown heteropolyoxometalates [gamma-SiO(4)W(10)O(32)(OH)Cr(2)(OOCR)(2)(OH(2))(2)](5-) (R = H, CH(3)) have been prepared by the reaction of [gamma-SiO(4)W(10)O(32)](8-) with [Cr(OH(2))(6)](3+) in formate or acetate buffer solution. Isolation of these new Cr(III)-substituted polyoxometalates was accompl…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsVanadium and Halogenation Chemistry
Yoon Seob Lee、Dede Surjadi、James F. Rathman1996-01-01Langmuir
The effect of ionic aluminate and silicate species on the structure of surfactant aggregates used in the preparation of mesoporous aluminosilicates was investigated using dynamic light scattering and rheological techniques. Aqueous cetyltrimethylammonium chloride (CTAC) solutions saturated with sodium aluminate, sodiu…
Surfactants and Colloidal SystemsMesoporous Materials and CatalysisAnalytical Chemistry and Chromatography
Jacques Bonvoisin、Jean‐Pierre Launay、Wouter Verbouwe 等 5 位作者1996-01-01The Journal of Physical Chemistry
This paper is devoted to two new aromatic polyamines derived from p -EFTP (5‘-(4-(bis(4-ethylphenyl)amino)phenyl)- N, N, N ‘, N ‘-tetrakis(4-ethylphenyl)-1,1‘:3‘,1‘‘-terphenyl-4,4‘‘-diamine) and exhibiting meta connections around a central phenylene ring. In p -EFDP (5‘-phenyl-( N, N, N ‘, N ‘-tetrakis(4-ethylphenyl)-…
Conducting polymers and applicationsLuminescence and Fluorescent MaterialsPhotochromic and Fluorescence Chemistry
John A. W. Harkless、Dorothea K. Stillinger、Frank H. Stillinger1996-01-01The Journal of Physical Chemistry
We have employed extensive configurational searches for numerical characterization of neutral (SiO 2 ) n clusters in their mechanically stable forms, i . e ., at local potential energy minima. These calculations have used additive pair interactions derived by Tsuneyuki et al ., supplemented with small-distance configu…
High-pressure geophysics and materialsMaterial Dynamics and PropertiesGlass properties and applications
Masahiro Irie1996-01-01Pure and Applied Chemistry
Abstract
Photochemistry and Electron Transfer StudiesPhotochromic and Fluorescence Chemistry
G. W. Neilson、J. E. Enderby1996-01-01The Journal of Physical Chemistry
The application of neutron diffraction techniques to aqueous solutions is described, and a framework involving the use of isotopic substitution is set up to illustrate the scope of the method. Specific applications described include a study of glassy electrolytes and aqueous solutions under nonambient conditions.
Material Dynamics and PropertiesThermodynamic properties of mixturesSpectroscopy and Quantum Chemical Studies
J. Robin Harris1996-01-01Medical Entomology and Zoology
Contents include : Introduction Negative staining: historical background and technical development Negative staining: preparative procedures Negative staining: some specialized approaches and problems Negative staining: selected applications Unstaine
Electron and X-Ray Spectroscopy Techniques
Werner Boullart、K. Devriendt、Ronny Borms 等 4 位作者1996-01-01The Journal of Physical Chemistry
In this work, the novel reaction mechanism initiated by the fast CH( 2 Π) + C 2 H 2 → C 3 H 2 + H reaction (r13a) and followed by C 3 H 2 + O → C 2 H + HCO (or H + CO) (r25a) was established as the dominant C 2 H formation pathway in low-pressure acetylene/atomic oxygen flames at 600 K. The C 2 H 2 /O/H flames were in…
Atmospheric chemistry and aerosolsAdvanced Combustion Engine TechnologiesCatalytic Processes in Materials Science
Xing-Zhi Song、Walter Jentzen、Song‐Ling Jia 等 8 位作者1996-01-01Journal of the American Chemical Society
The influence of substituents with increasing steric demands on the structure of nickel(II) 5,15-disubstituted porphyrins has been investigated with X-ray crystallography, UV−visible absorption spectroscopy, resonance Raman spectroscopy, molecular energy optimization calculations, and INDO/s molecular orbital calculat…
Metal complexes synthesis and propertiesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Norikazu Nishino、Richard W. Wagner、Jonathan S. Lindsey1996-01-01The Journal of Organic Chemistry
A modular building-block approach has been developed for the construction of linear amphipathic porphyrin arrays. The reaction of meso-(trifluoromethyl)dipyrromethane and an aldehyde under the conditions of the two-step room temperature porphyrin synthesis affords the trans-substituted porphyrin (13-56% yields). A sim…
Lipid Membrane Structure and BehaviorMolecular Sensors and Ion DetectionPorphyrin and Phthalocyanine Chemistry
Francesco Basile、L. Basini、Giuseppe Fornasari 等 6 位作者1996-01-01Chemical Communications
The synthesis and thermal evolution of new hydrotalcite-type (HT) anionic clays containing rhodium or ruthenium are investigated in order to obtain catalysts containing well dispersed and stable noble-metal particles, active, for example, in the partial oxidation of methane to synthesis gas.
Mesoporous Materials and CatalysisLayered Double Hydroxides Synthesis and ApplicationsThermal Expansion and Ionic Conductivity
George Chumanov、Konstantin Sokolov、Therese M. Cotton1996-01-01The Journal of Physical Chemistry
Two-dimensional arrays of 1000 Å silver particles were prepared by adsorption from colloidal suspensions onto glass slides derivatized with (3-mercaptopropyl)trimethoxysilane. By variation of the concentration of the colloidal suspensions, slides with different interparticle distances were obtained, and their extincti…
Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchNonlinear Optical Materials Studies
A. Berkó、G. Ménesi、F. Solymosi1996-01-01The Journal of Physical Chemistry
Rhodium in nanosize (1−3 nm) was prepared by vapor deposition of Rh on a well-ordered TiO 2 (110)1 × 2 single crystal. The morphology and the sizes of Rh had been determined by scanning tunneling microscopy in ultrahigh vacuum. The adsorption of CO at 300 K induces the disruption of Rh crystallites as indicated by a d…
Advanced Chemical Physics StudiesCatalytic Processes in Materials Sciencenanoparticles nucleation surface interactions
Paweł J. Kulesza、M. A. Malik、Krzysztof Miecznikowski 等 7 位作者1996-01-01Journal of The Electrochemical Society
Cobalt(II) hexacyanoferrate(III,II), a system analogous to prussian blue, is a unique electrochromic material: its color is not only dependent on the oxidation potential, but also on the nature of the countercations sorbed from electrolyte during reduction. The electrodeposition of cobalt hexacyanoferrate thin films,…
Conducting polymers and applicationsTransition Metal Oxide NanomaterialsAnalytical Chemistry and Sensors
Bernard Gallez、Goran Bačić、Harold M. Swartz1996-01-01Magnetic Resonance in Medicine
These experiments assessed and quantitated the release of free manganese Mn++ from the hepatobiliary contrast agent Mn-DPDP (manganese dipyridoxal diphosphate), using several magnetic resonance techniques (EPR spectroscopy, 31P-NMR spectroscopy, and relaxometry) to differentiate between free Mn++ and Mn++ in complexes…
Advanced MRI Techniques and ApplicationsRadioactive element chemistry and processingLanthanide and Transition Metal Complexes
N. Khosrovani、V. Korthuis、A.W. Sleight 等 4 位作者1996-01-01Inorganic Chemistry
The structure of cubic ZrP(2)O(7) at room temperature has been solved and refined using a combination of modeling and high-resolution neutron powder diffraction data. The cell edge is 24.74 Å, the space group is Pa&thremacr;, and Z is 108. For those P(2)O(7) units not on a 3-fold axis, the P-O-P angles range from 134…
Nuclear materials and radiation effectsInorganic Chemistry and MaterialsThermal Expansion and Ionic Conductivity
Santo Di Bella、Ignazio L. Fragalà、Tobin J. Marks 等 4 位作者1996-01-01Journal of the American Chemical Society
Attempts to discover molecular chromophores with large hyperpolarizabilities have largely focused on closed-shell organic species. This contribution explores the use of sum over states (SOS) perturbation theory and the computationally efficient intermediate neglect of differential overlap (INDO) model Hamiltonian, com…
Nonlinear Optical Materials ResearchSolid-state spectroscopy and crystallographyMolecular spectroscopy and chirality
Xiaoyuan Li、V. Ramamurthy1996-01-01Journal of the American Chemical Society
In the present paper, we report an unprecedented selectivity in the products during singlet oxygen mediated oxidation of olefins included within dye-exchanged X and Y zeolites. Singlet oxygen is generated within a zeolite by irradiating a thiazine dye exchanged into zeolites. Oxazine and thiazine dye molecules can be…
Zeolite Catalysis and SynthesisMesoporous Materials and CatalysisPorphyrin and Phthalocyanine Chemistry
Shigehito Deki、Yoshifumi Aoi、Hiroshi Yanagimoto 等 7 位作者1996-01-01Journal of Materials Chemistry
Au-dispersed TiO2(anatase) thin films have been prepared by a novel method, liquid-phase deposition (LPD). The deposited films were characterized by XRD, XPS, TEM and UV–VIS absorption spectroscopy. The results showed that the titanium oxide thin film containing AuIII ions was formed from a mixed solution of ammonium…
TiO2 Photocatalysis and Solar CellsQuantum Dots Synthesis And PropertiesCopper-based nanomaterials and applications
R. Campostrini、Gennaro D'Andrea、Giovanni Carturan 等 5 位作者1996-01-01Journal of Materials Chemistry
Monolithic and transparent gels were prepared by mixing various ethoxide silicon precursors containing Si—CH3 and Si—H groups, the composition ensuring the same number of C—H and Si—H bonds. Pyrolysis of these samples was followed under helium flow by connecting thermogravimetry, gas chromatographic and mass spectrome…
Diamond and Carbon-based Materials ResearchGlass properties and applicationsSilicone and Siloxane Chemistry