Michael P. DeNinno、Robert Schoenleber、Richard J. Perner 等 8 位作者1991-08-01Journal of Medicinal Chemistry
The synthesis and dopaminergic activity of a series of C3 and nitrogen-substituted 1-(aminomethyl)-3,4-dihydro-5,6-dihydroxy-1H-2-benzopyrans (isochromans) is described. The synthesis of the compounds was stereospecific for the 1,3 cis isomer, and the enantioselective synthesis of both enantiomers of one of the analog…
Molecular Sensors and Ion DetectionReceptor Mechanisms and SignalingPhotochromic and Fluorescence Chemistry
Shinji Hashimoto、Yasuhisa Mizutani、Yoshitaka Tatsuno 等 4 位作者1991-08-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman characterization of ferric and ferryl porphyrin .pi. cation radicals and the FeIV:0 stretching frequencyShinji Hashimoto, Yasuhisa Mizutani, Yoshitaka Tatsuno, and Teizo KitagawaCite this: J. Am. Chem. Soc. 1991, 113, 17, 6542–6549Publication Date (Print):Aug…
Porphyrin and Phthalocyanine ChemistryMolecular Junctions and NanostructuresElectron Spin Resonance Studies
Douglas A. Burg、R. Kleiman1991-08-01Journal of the American Oil Chemists Society
Abstract Meadowfoam dimer acids have been prepared in a thermal clay‐catalyzed reaction. Reaction conditions have been optimized, and yields of 44% were obtained with 2% water and 6–8% of an acid‐washed montmorillonite clay, based on the meadowfoam fatty acids. Purity of the distilled dimer acids was 79–89% with most…
biodegradable polymer synthesis and propertiesLubricants and Their AdditivesTribology and Wear Analysis
Gregory T. Pawlikowski、Dhiraj Dutta、R A Weiss1991-08-01Annual Review of Materials Science
Advances in machine learning have impacted myriad areas of materials science, such as the discovery of novel materials and the improvement of molecular simulations, with likely many more important developments to come. Given the rapid changes in this ...Read More
Polymer Nanocomposites and PropertiesSilicone and Siloxane Chemistry
Kuan-Zong Fung、Anil V. Virkar1991-08-01Journal of the American Ceramic Society
Single‐phase, cubic solid solutions of baseline composition 25% Y 2 O 3 —75% Bi 2 O 3 with and without aliovalent dopants were fabricated by pressureless sintering of powder compacts. CaO, SrO, ZrO 2 , or ThO 2 was added as an aliovalent dopant. Sintered samples were annealed between 600° and 650°C for up to 4000 h. S…
Advancements in Solid Oxide Fuel CellsNuclear materials and radiation effectsThermal Expansion and Ionic Conductivity
Jan Fong Jue、Jong Chen、Anil V. Virkar1991-08-01Journal of the American Ceramic Society
Polycrystalline, tetragonal ( t ′) zirconia samples containing 3 and 4 mol% yttria were fabricated by annealing pressureless‐sintered samples in air at ∼ 2100°C for 15 min. The grain size of these fully tetragonal samples was on the order of 100 to 200 μm. Domain structure of the samples and of a 3‐mol%‐yttria‐doped t…
Advanced ceramic materials synthesisAdvancements in Solid Oxide Fuel CellsNuclear materials and radiation effects
P. Van Haver、N. Helsen、S. Depaemelaere 等 5 位作者1991-08-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe influence of solvent polarity of the nonradiative decay of exciplexesP. Van Haver, N. Helsen, S. Depaemelaere, M. Van der Auweraer, and F. C. De SchryverCite this: J. Am. Chem. Soc. 1991, 113, 18, 6849–6857Publication Date (Print):August 1, 1991Publication History Publis…
Photochemistry and Electron Transfer StudiesLanthanide and Transition Metal ComplexesFree Radicals and Antioxidants
Ronald Hage、Jaap G. Haasnoot、J. Reedijk 等 5 位作者1991-08-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear and dinuclear ruthenium complexes with triazole containing ligands; fine-tuning of the spectroscopic propertiesRonald Hage, Jaap G. Haasnoot, Jan Reedijk, Renyi Wang, and Johannes G. VosCite this: Inorg. Chem. 1991, 30, 17, 3263–3269Publication Date (Print):Augus…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Richard C. Holz、C. Allen Chang、William DeW. Horrocks1991-08-01Inorganic Chemistry
The Eu3+ and Y3+ complexes of a series of N,N'-bis(carboxymethyl) macrocyclic ether bis(lactone) ligands derived from ethylenediaminetetraacetic acid (EDTA) were characterized in solution by using Eu3+ laser-induced luminescence and 1H and 13CNMR spectroscopy. The complexation of EDTA was also studied for comparison p…
Lanthanide and Transition Metal ComplexesInorganic and Organometallic ChemistryChemical Thermodynamics and Molecular Structure
Charles L. Beckel、Mohammad Yousaf、Mary Z. Fuka 等 5 位作者1991-08-01Physical review. B, Condensed matter
Crystalline \ensuremath{\alpha}-boron consists of ${\mathrm{B}}_{12}$ icosahedra in a rhombohedral lattice of R3\ifmmode\bar\else\textasciimacron\fi{}m space-group symmetry. We here carry out a classical force-field analysis of the lattice vibrations. The q=0 Brillouin-zone vibrations are treated as those of a ${\math…
High-pressure geophysics and materialsFullerene Chemistry and ApplicationsBoron and Carbon Nanomaterials Research
Rint P. Sijbesma、Roeland J. M. Nolte1991-08-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA molecular clip with allosteric binding propertiesRint P. Sijbesma and Roeland J. M. NolteCite this: J. Am. Chem. Soc. 1991, 113, 17, 6695–6696Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.ac…
Porphyrin and Phthalocyanine Chemistry
Masahiro Hosoda、Tatsuo Wada、Akira Yamada 等 5 位作者1991-08-01Japanese Journal of Applied Physics
The third-order optical susceptibilities χ 1111 (3) (-3ω; ω, ω, ω) s f o r t w o d i f f e r e n t p h a s e s i n v a n a d y l a n d t i t a n y l p h t h a l o c y a n i n e ( V O P c a n d T i O P c ) v a c u u m - d e p o s i t e d t h i n f i l m s a r e d e t e r m i n e d b y o p t i c a l t h i r d - h a r m…
Porphyrin and Phthalocyanine ChemistryNonlinear Optical Materials ResearchNonlinear Optical Materials Studies
Andrzej Ożarowski、Yu Shunzhong、Bruce R. McGarvey 等 5 位作者1991-08-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEPR and NMR study of the spin-crossover transition in bis(4,4'-bi-1,2,4-triazole)bis(thiocyanato)iron hydrate and bis(4,4'-bi-1,2,4-triazole)bis(selenocyanato)iron hydrate. X-ray structure determination of Fe(4,4'-bi-1,2,4-triazole)2(SeCN)2.cntdot.H2OAndrzej Ozarowski, Yu Sh…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Andréa Caneschi、Fabrizio Ferraro、Dante Gatteschi 等 5 位作者1991-08-01Inorganic Chemistry
A novel compound formed by copper(II) and a nitronyl nitroxide radical of formula [Cu(hfac)2]3(NITpPy)2 (where hfac = hexafluoroacetylacetonato and NITpPy = 2-(4-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide) was synthesized. It crystallizes in the monoclinic system, space group C2/c, with a 36.540 (9) angstr…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Bernhard Weßling1991-08-01Polymer Engineering and Science
Abstract A new dispersion/flocculation phase transition model for the conductivity jump at the critical volume concentration of a conductive phase in an insulating matrix polymer is discussed. New experimental‐data including: SEM evaluations of the “seam” structure, excess pyrolytic residue analysis, BET measurements…
Polymer Nanocomposites and PropertiesHigh voltage insulation and dielectric phenomenaElectrostatics and Colloid Interactions
Paul W. Brown、Nancy Hocker、S.L. Hoyle1991-08-01Journal of the American Ceramic Society
Both the kinetics and the microstructure of monolithic hydroxyapatite formed by a low‐temperature dissolution and precipitation reaction strongly depend on the conditions in solution during the reaction. The relationships between the molar ratio of the particulate reactants (dicalcium phosphate and tetracalcium phosph…
Crystallization and Solubility StudiesThermal and Kinetic AnalysisX-ray Diffraction in Crystallography
R. C. Tennyson1991-08-01Canadian Journal of Physics
This paper describes the operation and performance of an atomic-oxygen (AO) beam facility developed at the University of Toronto Institute for Aerospace Studies (UTIAS), capable of providing ground-state neutral oxygen atoms at ~ 2.2 eV for flux levels as high as ~ 10 16 atoms (cm 2 s) −1 . Results are presented on th…
Catalytic Processes in Materials SciencePlasma Diagnostics and ApplicationsSilicone and Siloxane Chemistry
C.-T. Chen、B.S. Skerry1991-08-01CORROSION
Four organic coatings of commercial grade (polyurethane, epoxy-polyamide, medium-quality and low-cost alkyds) with an expected range of corrosion protective properties were applied to steel substrates and immersed for up to 4,300 h in 0.6 M NaCl solution. These painted electrodes were assessed by AC impedance in the f…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityNon-Destructive Testing Techniques
N. S. Vandamme、Audrey E. Sutherland、Lori Jones 等 5 位作者1991-08-01Journal of the American Ceramic Society
The tetragonal tungsten bronze (TTB) type of Sr x Ba 1− x m Nb 2 O 6 (SBN) (0.5 ≤ x ≤ 0.75) was synthesized by a mixed‐oxide route. Using the two‐step densification process of pressureless sintering followed by oxygen HIPing, transparent ceramics were successfully fabricated. Microstructural, dielectric, optical, and…
Ferroelectric and Piezoelectric MaterialsGlass properties and applicationsPhotorefractive and Nonlinear Optics
Evangelos Dalas、Jannis Kallitsis、Petros G. Koutsoukos1991-08-01Langmuir
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of hydroxyapatite on polymersEvangelos Dalas, Jannis K. Kallitsis, and Petros G. KoutsoukosCite this: Langmuir 1991, 7, 8, 1822–1826Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pub…
Calcium Carbonate Crystallization and Inhibition