Silvia Destri、Mariacecilia Pasini、William Porzio 等 5 位作者2003-01-24Crystal Growth & Design
The title compound, a molecule that assembles several moieties on a strategic route to the formation of photoluminescent materials (PL), has been prepared by Suzuki heterocoupling. The molecule consists of a 1,1-dioxothiophene core with hexylic chains in 3,4-position and two 9,9-dimethyl fluorene wings. The dialkyl su…
Conducting polymers and applicationsLuminescence and Fluorescent MaterialsPhotochromic and Fluorescence Chemistry
Gwang-Hee Kim2003-01-24Physical review. B, Condensed matter
The level splittings in a dimer with antiferromagnetic coupling between two single-molecule magnets are calculated perturbatively for arbitrary spins. It is found that the exchange interaction between two single-molecule magnets plays an important role in the level splitting. The results are discussed in comparison wi…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Jason A. Gratt、Robert E. Cohen2003-01-24Journal of Applied Polymer Science
Abstract Ultraviolet–visible absorption spectra and photoluminescence spectra were used to demonstrate efficient charge‐carrier migration in a novel bulk heterogeneous block copolymer system. One moiety of the block copolymer was functionalized with charge‐transporting carbazole groups, whereas the other block formed…
Organic Electronics and PhotovoltaicsQuantum Dots Synthesis And PropertiesConducting polymers and applications
Hongwei Ma、Guo‐Cong Guo、Ming‐Sheng Wang 等 7 位作者2003-01-24Inorganic Chemistry
A new series of novel isostructural metal chalcogenides, K(2)CuIn(3)Se(6) (1), K(2)CuGa(3)Se(6) (2), and K(2)AgIn(3)Se(6) (3), were obtained by a reactive flux technique and structurally characterized. Compounds 1, 2, and 3 crystallize in the space group C2/c of the monoclinic system with eight formula units in a cell…
Chalcogenide Semiconductor Thin FilmsCrystal Structures and PropertiesPhase-change materials and chalcogenides
J.E. Debreczeni、Gàbor Bunkòczi、Beatrix Girmann 等 4 位作者2003-01-24Acta Crystallographica Section D Biological Crystallography
SAD (single-wavelength anomalous diffraction) has enormous potential for phasing proteins using only the anomalous signal of the almost ubiquitous native sulfur, but requires extremely precise data. The previously unknown structure of the lima bean trypsin inhibitor (LBTI) was solved using highly redundant data collec…
Glycosylation and Glycoproteins ResearchEnzyme Structure and FunctionEnzyme Production and Characterization
Alexei S. Karpov、Frank Röminger、Thomas J. J. Müller2003-01-24The Journal of Organic Chemistry
A straightforward coupling-aminovinylation sequence of terminal alkynes 1, electron-deficient heteroaryl halides 2, and secondary amines 4 furnishes highly solvochromic push-pull chromophores 5 in good yields. Semiempirical calculations (PM3) suggest that the aminovinylation proceeds in a stepwise fashion through a zw…
Conducting polymers and applicationsPorphyrin and Phthalocyanine ChemistryLuminescence and Fluorescent Materials
Raúl Chiozzone、Ricardo González、Carlos Kremer 等 8 位作者2003-01-24Inorganic Chemistry
Four rhenium(IV)-M(II) bimetallic complexes of formula [ReCl(4)(mu-ox)M(dmphen)(2)].CH(3)CN with M = Mn (1), Fe (2), Co (3), and Ni (4) (ox = oxalate anion, dmphen = 2,9-dimethyl-1,10-phenanthroline) have been synthesized and the crystal structures of 1 and 3 determined by single-crystal X-ray diffraction. 1 and 3 are…
Metal complexes synthesis and propertiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Philippe Bébin、Robert E. Prud’homme2003-01-24Chemistry of Materials
Two nitrogen-containing polymers, polyacrylonitrile and poly(styrene- co -acrylonitrile), and three oxygen-containing polymers, poly(vinyl methyl ether), poly(vinyl methyl ketone) and poly(methyl methacrylate), were coated with copper, nickel, and aluminum under ultrahigh vacuum, and their surfaces were analyzed by X-…
Semiconductor materials and devicesConducting polymers and applicationsElectron and X-Ray Spectroscopy Techniques
U. R. Shukla、K. Visweswara Rao、Animesh Kumar Rakshit2003-01-24Journal of Applied Polymer Science
Abstract A series of poly(azomethine ester) copolymers were synthesized by the solution polycondensation method with different diamines. The synthesized polymers were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry (DSC), hot‐stage polarized micro…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersThermal and Kinetic Analysis
J. Coutinho、V. J. B. Torres、R. Jones 等 4 位作者2003-01-24Physical review. B, Condensed matter
The interaction of hydrogen with substitutional chalcogen impurities (S, Se, or Te) is investigated by ab initio modeling. In $\mathrm{Se}\ensuremath{-}{\mathrm{H}}_{n}$ and $\mathrm{Te}\ensuremath{-}{\mathrm{H}}_{n}$ complexes $(n=1,2),$ protons are located at sites antibonding to nearest-neighbor silicon atoms. For…
Advanced Chemical Physics StudiesPhase-change materials and chalcogenidesSolid-state spectroscopy and crystallography
Hiroaki Imai、Tomohiro Terada、Satoshi Yamabi2003-01-24Chemical Communications
Self-organized growth of calcite crystals in a supersaturated solution with a gradual increase in the influence of silicate anions resulted in the formation of a hierarchical self-similar morphology consisting of three-pointed stars with sizes ranging from 100 nm to 100 micrometer.
Paleontology and Stratigraphy of FossilsCalcium Carbonate Crystallization and InhibitionCrystallization and Solubility Studies
Y. Ren、Agustinus Agung Nugroho、A.A. Menovsky 等 8 位作者2003-01-24Physical review. B, Condensed matter
The structural phase transition in the orthovanadates ${\mathrm{LaVO}}_{3}$ and ${\mathrm{CeVO}}_{3}$ has been studied with high energy synchrotron x-ray diffraction. ${\mathrm{LaVO}}_{3}$ undergoes a second order phase transition at ${T}_{N}=143\mathrm{K}$ and a first order transition at ${T}_{t}=141\mathrm{K},$ whil…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsElectronic and Structural Properties of Oxides
A. D’Arcy、A. Mac Sweeney、M. Stihle 等 4 位作者2003-01-24Acta Crystallographica Section D Biological Crystallography
In this study, characterization and optimization of a modified microbatch crystallization technique has been attempted in order to provide a rapid screening method. Using this method for screening has certain advantages over standard vapour-diffusion methods: no sealing of drops is required, no reservoir solutions are…
Protein purification and stabilityEnzyme Structure and FunctionCrystallization and Solubility Studies
Kristina Nilsson、D. Lecerof、Emma Sigfridsson 等 4 位作者2003-01-24Acta Crystallographica Section D Biological Crystallography
A program, Hess2FF, has been developed that automatically constructs parameter and topology files to be used in crystallographic refinement for any molecule, based on a Hessian (force-constant) matrix estimated by any method. The program is tested by redefining hetero-compounds in five different proteins: the inhibito…
Protein Structure and DynamicsEnzyme Structure and FunctionPorphyrin Metabolism and Disorders
H. M. Zidan2003-01-24Journal of Applied Polymer Science
Abstract PVA films with various filling levels of CrF 3 and MnCl 2 were prepared. ESR and UV/VIS optical analysis were used to shed more light on the structural modification that occur due to filling with different levels and/or UV irradiation. The ESR analysis revealed that the spin configuration of CrF 3 , MnCl 2 ,…
Polymer Nanocomposites and PropertiesConducting polymers and applicationsPolymer Nanocomposite Synthesis and Irradiation
Shuxue Zhou、Limin Wu、Jian Sun 等 4 位作者2003-01-24Journal of Applied Polymer Science
Abstract Polyester‐based polyurethanes with embedded nanosilica particles were prepared. The viscosity of polyester resins without and with nanosilica was determined by rheoviscometry. The morphology and mechanical and optical properties of the polyurethane coatings were studied intensively with a transmission electro…
Polymer Nanocomposites and PropertiesPolymer composites and self-healingSilicone and Siloxane Chemistry
Jenny Y. Yang、Matthew P. Shores、J.J. Sokol 等 4 位作者2003-01-24Inorganic Chemistry
The use of 1,3,5-triaminocyclohexane (tach) as a capping ligand in generating metal-cyanide cage clusters with accessible cavities is demonstrated. The precursor complexes [(tach)M(CN)(3)] (M = Cr, Fe, Co) are synthesized by methods similar to those employed in preparing the analogous 1,4,7-triazacyclononane (tacn) co…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesInorganic Chemistry and Materials
Maitri Warusawithana、Eugene V Colla、J. N. Eckstein 等 4 位作者2003-01-24Physical Review Letters
A variety of three-constituent superlattice patterns were made in atomic layer-by-layer films, with patterns breaking inversion symmetry giving effective permanent bias fields ranging up to about 200 kV/cm. Dielectric constants at room temperature were nearly 10(3), with loss tangents under 0.01. Most of the response…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsAcoustic Wave Resonator Technologies
C. Seward、Jacquelyn Chan、Datong Song 等 4 位作者2003-01-24Inorganic Chemistry
The reaction of AgX, where X = trifluoroacetate (CF(3)CO(2)(-), tfa), nitrate (NO(3)(-)), trifluoromethanesulfonate (triflate, CF(3)SO(3)(-), OTf), hexafluorophosphate (PF(6)(-)), or perchlorate (ClO(4)(-)), with 2,2',3' '-tripyridylamine (tpa) yields five novel silver(I) complexes, which have been structurally charac…
Metal-Organic Frameworks: Synthesis and ApplicationsMetal complexes synthesis and propertiesMagnetism in coordination complexes
Jun Li、Xiping Ni、Zhihan Zhou 等 4 位作者2003-01-24Journal of the American Chemical Society
A series of new polypseudorotaxanes were synthesized in high yields when the middle poly(ethylene oxide) (PEO) block of poly(propylene oxide)-poly(ethylene oxide)-poly(propylene oxide) (PPO-PEO-PPO) triblock copolymers was selectively recognized and included by alpha-cyclodextrin (alpha-CD) to form crystalline inclusi…
Advanced Polymer Synthesis and CharacterizationSupramolecular Chemistry and ComplexesSilicone and Siloxane Chemistry