Rebecca R. Conry、William S. Striejewske、A.A. Tipton1999-05-20Inorganic Chemistry
A new macrocyclic ligand with a pendant naphthalene group, N-[2-(1-naphthyl)ethyl]-1-aza-4,8-dithiacyclodecane (L), has been synthesized and characterized. The copper(I)-acetonitrile complex [LCu(CH(3)CN)](PF(6)) (1) was synthesized from L and [Cu(CH(3)CN)(4)](PF(6)). The acetonitrile ligand from 1 was easily removed…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Katsuhiko Fujita、Shunsaku Kimura、Yukio Imanishi1999-05-20Langmuir
A self-assembly of a helical peptide in an aqueous medium was investigated in an attempt to compose a supramolecular structure. A peptide, HA16B, having a hydrophobic α-helical body and a hydrophilic polar head was synthesized and hydrated in water by sonication to obtain a transparent dispersion. Circular dichroism m…
Chemical Synthesis and AnalysisSupramolecular Self-Assembly in MaterialsPolydiacetylene-based materials and applications
Kevin T. Moore、J. T. FLETCHER、Michael J. Therien1999-05-20Journal of the American Chemical Society
Syntheses, structural studies, electrochemistry, and spectroscopy of a number of [5,10,15,20-tetrakis(heptafluoropropyl)porphinato]iron derivatives are presented. The X-ray crystal structure of 5,10,15,20-tetrakis(heptafluoropropyl)porphinato]iron(II)·(pyridine) 2 exhibits a substantial S 4 distortion of the porphyrin…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
M.K. Ellison、W. Robert Scheidt1999-05-20Journal of the American Chemical Society
The preparation and characterization of several {FeNO} 6 porphyrinates ([Fe(OEP)(L)(NO)] + ), where OEP is octaethylporphyrin and L is one of the neutral nitrogen-donating axial ligands 1-methylimidazole (1-MeIm), pyrazole (Pz), indazole (Iz), or pyrazine (Prz), are described. The synthesis and crystallization of thes…
Nitric Oxide and Endothelin EffectsPorphyrin and Phthalocyanine ChemistryHemoglobin structure and function
D. Pötschke、Matthias Ballauff、Peter Lindner 等 5 位作者1999-05-20Macromolecules
The analysis of a dendrimer of fifth generation by small-angle neutron scattering (SANS) in solution is presented. The contrast of the solute toward the solvent dimethylacetamide (DMA) is changed systematically by measurements of the dendrimer in mixtures of deuterated with protonated DMA. Additional SANS measurements…
Mass Spectrometry Techniques and ApplicationsRNA Interference and Gene DeliveryDendrimers and Hyperbranched Polymers
Byoung‐Suhk Kim、Li Chen、Minglun Gong 等 4 位作者1999-05-20Macromolecules
Water-soluble poly(3-thiophene acetic acid) (P3TAA) and its copolymers with 3- n -methylthiophene or with 3- n -octadecylthiophene were synthesized. The solution properties of these water-soluble polythiophene carboxylic acids were studied by potentiometric titration, viscosity measurements, and UV−visible spectroscop…
Conducting polymers and applicationsAnalytical Chemistry and SensorsPolydiacetylene-based materials and applications
Julyan H. E. Cartwright、Victor M. Eguiluz、Emilio Hernandez-Garcia 等 4 位作者1999-05-20arXiv
The Burridge-Knopoff model of earthquake faults with viscous friction is equivalent to a van der Pol-FitzHugh-Nagumo model for excitable media with elastic coupling. The lubricated creep-slip friction law we use in the Burridge-Knopoff model describes the frictional sliding dynamics of a range of real materials. Low-d…
chao-dynMaterials Sciencenlin.CD
A.-L. Barra、Andréa Caneschi、Andrea Cornia 等 8 位作者1999-05-20OpenAlex
The synthesis, crystal structure, and magnetic characterization of a novel tetranuclear iron(III) methoxo-bridged cluster of formula Fe 4 (OCH 3 ) 6 (dpm) 6 (where Hdpm = dipivaloylmethane) is reported. The cluster has a ground spin state of S = 5, which is selectively populated below 20 K. High-field EPR spectra reve…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesMetal-Catalyzed Oxygenation Mechanisms
Hugh W. Hillhouse、Jan W. van Egmond、Michael Tsapatsis1999-05-19Langmuir
A new method has been demonstrated to synthesize highly oriented mesostructured coatings of tungsten oxide/surfactant composites on amorphous substrates by a shear-flow-induced deposition mechanism. The applied flow field provides convective transport of film precursors and orients the domains of the mesostructure, re…
Catalytic Processes in Materials ScienceMesoporous Materials and CatalysisFluid Dynamics and Thin Films
Yuqing Wu、Bing Zhao、Weiqing Xu 等 6 位作者1999-05-19Langmuir
Near-infrared (NIR) Fourier transform (FT) surface-enhanced Raman scattering (SERS) spectra were measured for Langmuir−Blodgett (LB) and dipping films of azobenzene-containing long-chain fatty acids ( n A m H, n = 8, 12, m = 3, 5) on silver substrates prepared by silver mirror and nitric acid etched silver foil method…
Gold and Silver Nanoparticles Synthesis and ApplicationsChalcogenide Semiconductor Thin Films
Antonio Montalbán、H. Meunier、Richard Ostler 等 6 位作者1999-05-19The Journal of Physical Chemistry A
We report on the efficient photooxidation of hexapropyl bis(dimethylamino) zinc porphyrazine. The process is shown to be autocatalytic. The triplet state of the seco -ZnPz sensitizes the formation of excited-state singlet oxygen with a quantum yield of 0.54 and subsequent cleavage of the pyrrole double bond occurs to…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesProtein Interaction Studies and Fluorescence Analysis
Phillip J. Stone、Roger A. Bennett、Michael Bowker1999-05-19New Journal of Physics
The re-oxidation of slightly reduced TiO 2 (110) surfaces by exposure to an oxygen pressure of ~2 × 10 -7 mbar in the temperature range 473-1000 K occurs by re-growth of TiO 2 overlayers by diffusion of Ti n + interstitials from the bulk. Starting with a (1 × 2) reconstructed surface, scanning tunnelling microscope im…
Catalytic Processes in Materials ScienceSemiconductor materials and devicesElectronic and Structural Properties of Oxides
Ione Cendoya、Ángel Alegría、J. M. Alberdi 等 7 位作者1999-05-19Macromolecules
In this work we have investigated how the dynamics of poly(vinyl methyl ether), PVME, changes by blending with deuterated polystyrene. The experimental techniques used were dielectric spectroscopy, quasielastic neutron scattering, and 13 C nuclear magnetic resonance. By means of these techniques, the dynamics of the p…
Material Dynamics and PropertiesThermodynamic properties of mixturesNMR spectroscopy and applications
Ann J. Stemmler、Jeff W. Kampf、Martin L. Kirk 等 5 位作者1999-05-19Inorganic Chemistry
The preparation and characterization of a series of encapsulated-lanthanide 15-metallacrown-5 complexes are reported. Planar ligands such as picoline hydroxamic acid (picha) or nonplanar alpha-amino hydroxamic acids (e.g., glycine hydroxamic acid (glyha)) led to one-step syntheses of metallacrowns in yields as high as…
Metal-Organic Frameworks: Synthesis and ApplicationsMagnetism in coordination complexesLanthanide and Transition Metal Complexes
H. M. Cataldo1999-05-19arXiv
The stability of a quasicrystalline structure, recently obtained in a molecular-dynamics simulation of rapid cooling of a binary melt, is analyzed for binary hard-sphere mixtures within a density-functional approach. It is found that this quasicrystal is metastable relative to crystalline and fluid phases for diameter…
Materials Sciencecond-mat.stat-mech
Arkady A. Karyakin、Maika Vuki、Lylia V. Lukachova 等 7 位作者1999-05-19Analytical Chemistry
An advanced potentiometric pH transducer based on processible polyaniline (PCPAn) is reported on. Both glassy carbon and screen-printed carbon electrodes modified with PCPAn by dip-coating exhibited a fully reversible potentiometric response of approximately 90 mV/pH unit over the range from pH 3 to 9. Such a signific…
Electrochemical sensors and biosensorsConducting polymers and applicationsAnalytical Chemistry and Sensors
Ramin Golestanian、Mehran Kardar、Tanniemola B. Liverpool1999-05-19arXiv
The effective elasticity of highly charged stiff polyelectrolytes is studied in the presence of counterions, with and without added salt. The rigid polymer conformations may become unstable due to an effective attraction induced by counterion density fluctuations. Instabilities at the longest, or intermediate length s…
Materials ScienceSoft Condensed Mattercond-mat.stat-mech
F. M. Munteanu、Yongmin Kim、C. H. Perry 等 5 位作者1999-05-19arXiv
The magnetophotoluminescence (MPL) behavior of a GaAs/Al(0.3)Ga(0.7)As single heterojunction has been investigated to 60T. We observed negatively charged singlet and triplet exciton states that are formed at high magnetic fields beyond the nu=1 quantum Hall state. The variation of the charged exciton binding energies…
Mesoscale and Nanoscale PhysicsMaterials Science
Yongmin Kim、F. M. Munteanu、C. H. Perry 等 7 位作者1999-05-19arXiv
Coulomb driven, magneto-optically induced electron and hole bound states from a series of heavily doped GaAs/Al(0.3)Ga(0.7)As single heterojunctions (SHJ) are revealed in high magnetic fields. At low magnetic fields (nu > 2), the photoluminescence spectra display Shubnikov de-Haas type oscillations associated with the…
Mesoscale and Nanoscale PhysicsMaterials Science
Jeffrey R. Reimers、Lachlan E. Hall、Maxwell J. Crossley 等 4 位作者1999-05-18The Journal of Physical Chemistry A
Over 100 oligoporphyrin (porphyrin molecules fused to each other through rigid acene-type bridges) molecules have now been synthesized, their long rigid π-bonded structures making them very suitable as molecular wires while their synthetic flexibility offers the possibility of tailoring their structural and electronic…
Porphyrin and Phthalocyanine ChemistryMolecular Junctions and NanostructuresSurface Chemistry and Catalysis