Materials Literature
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Ab initio calcns. have been performed on TinO2n-δ clusters, with n = 1-3 and δ = 0, 1, as well as on some of their ionized species. The geometries of the different clusters were optimized and vibrational analyses were performed at the ground-state equil. geometries. The Ti-O bond lengths are essentially detd. by the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric coordination complexes based on cobalt, nickel, and ruthenium that exhibit synergistic thermal propertiesLaurence A. Belfiore, Mary Pat McCurdie, and Eiji UedaCite this: Macromolecules 1993, 26, 25, 6908–6917Publication Date (Print):December 1, 1993Publication Hist…
Certain liquids with a very low vapour pressure, such as glycerol or triethylene glycol, can be used to infiltrate biological specimens so that they may be observed in the scanning electron microscope (SEM) without drying. The conductive properties of the fluids allow specimens to be examined either uncoated or with v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe origin of infrared marker bands of porphyrin .pi.-cation radicals: infrared assignments for cations of copper(II) complexes of octaethylporphine and tetraphenylporphineSongzhou Hu and Thomas G. SpiroCite this: J. Am. Chem. Soc. 1993, 115, 25, 12029–12034Publication Date…
Abstract An exact expression for the elastic energy associated with a semicircular shear dislocation loop emanating from a free surface is derived (within continuum dislocation theory) and compared with an earlier approximation. The energy required to activate a semicircular dislocation loop into its unstable “saddle‐…
Pyruvate formate-lyase is a radical-containing enzyme that catalyzes the nonoxidative cleavage of pyruvate via a postulated homolytic mechanism. The formation of this enzymic radical in vitro requires an activating system composed of PFL-activating enzyme, S-adenosylmethionine, ferrous ion, a reduced flavin, DTT, and…
Abstract.- Protons from hydrogen or water vapour may dissolve in oxides and other corrosion products, and may affect, and in some cases, dominate their defect structures. Defect-dependent properties like scale growth and plastic deformation then become dependent on the ambient hydrogen or water vapour pressure. Small…
Sm-Fe-N permanent magnets have been prepared by mechanical alloying of Sm and Fe powder and subsequently treating the material in a two-step process. Measurements of the minor hysteresis loops and of the initial magnetization curve were performed at room temperature. The reversible susceptibility (χrev), the total sus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilanol synthesis: reaction of hexaphenylcyclotrisiloxane with organometallic reagentsScott M. Sieburth and Weilin MuCite this: J. Org. Chem. 1993, 58, 26, 7584–7586Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 Dec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFT-IR study of polymorphic transformations in SOS, POP, and POSJunko Yano, Satoru Ueno, Kiyotaka Sato, Toshiharu Arishima, Nobuo Sagi, Fumitoshi Kaneko, and Masamichi KobayashiCite this: J. Phys. Chem. 1993, 97, 49, 12967–12973Publication Date (Print):December 1, 1993Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAsymmetric block copolymer melts near the microphase separation transition: a Monte Carlo simulationK. Binder and H. FriedCite this: Macromolecules 1993, 26, 25, 6878–6883Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue…
X-ray diffraction rocking curves of a strained-layer superlattice structure have been measured at symmetric and asymmetric Bragg reflections and compared with simulated diffraction curves. The calculations are based on dynamical scattering theory. The experimental and theoretical curves exhibit a discrepancy with rega…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA proton NMR study of the reactions with acid of meso-tetraphenylporphyrins with various numbers of 4-(dimethylamino) groupsRobert I. Walter, Emmanuel C. A. Ojadi, and Henry LinschitzCite this: J. Phys. Chem. 1993, 97, 50, 13308–13312Publication Date (Print):December 1, 1993…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the polyoxoanion-supported ruthenium(I)-ruthenium(I) tetracarbonyls [(P3O9)2Ru2(CO)4]4- and [(Cp*TiW5O18)2Ru2(CO)4]4-Walter G. Klemperer and Bianxiao ZhongCite this: Inorg. Chem. 1993, 32, 25, 5821–5826Publication Date (Print):December 1, 19…
In an attempt to understand the fundamental ways in which molecules interact with metal-oxide surface, chemisorption has been studied on single-crystal oxide samples. Chemisorption behavior is determined both by the electronic configuration of surface cations and by the geometric structure of the surface. Stoichiometr…
Abstract Main chain liquid crystal thermoplastic polyesters and thermosetting epoxy resins were prepared using biphenyl mesogens. The melting points of the polyesters were effectively decreased by incorporating flexible methylene spacers into the polymer main chain. The liquid crystal epoxy resins exhibit high glass t…
Abstract Boron trifluoride reacted with dipyrid‐2‐ylamine 6 , its N‐methyl and 6,6′‐dimethyl derivatives 8 and 10 , and 3,3′,5,5′‐tetraphenyl‐6‐azapyrromethene 13 to give fluorescent β‐azavinamidine (1,3,5‐triazapenta‐1,3‐diene) dyes: 10‐azapyridomethene–BF 2 complex 5 (λ f 422 nm, λ las 426 nm), its quaternary 10‐met…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure, low-temperature, single-crystal neutron diffraction study of deuterated and hydrogenous ammonium hexaaquacopper(II) sulfate (Tutton's salt): a pressure-switchable Jahn-Teller distortionCharles J. Simmons, Michael A. Hitchman, Horst Stratemeier, and Arthur J. S…
Abstract Smectite and zeolites were formed from a volcanic glass as the products of reaction with NaOH solution at 90°C and 100°C under atmospheric pressure. Formation conditions of smectite and various zeolites were determined by the ratio of the amounts of volcanic glass (g) to NaOH (g) in the solution. Smectite was…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexanuclear ferric complexes possessing different degrees of spin frustrationCheryl A. Christmas, Hui Lien Tsai, Luca Pardi, Janet M. Kesselman, Peter K. Gantzel, Raj K. Chadha, Dante Gatteschi, Daniel F. Harvey, and David N. HendricksonCite this: J. Am. Chem. Soc. 1993, 115…