Materials Literature
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The Gd3+ complexes of three new phosphorus containing tetraaza macrocycles (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene ethylphosphonic acid), H4DOTEP; 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene phosphonic acid monoethylester), H4DOTPME; and the corresponding n-butyl ester, H4DOTPMB) w…
The application of a mechanical properties microprobe to evaluate the interfacial properties of fiber‐reinforced ceramic composites is addressed. The stress–displacement relation of the embedded fiber, which is subjected to an axial loading–unloading cycle, is analyzed. The interfacial bonding, Coulomb friction at the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of squaraine dyes. 6. Solvent hydrogen bonding effects on the photophysical properties of bis(benzothiazolylidene)squarainesSuresh Das, K. George Thomas, R. Ramanathan, M. V. George, and P. V. KamatCite this: J. Phys. Chem. 1993, 97, 51, 13625–13628Publication…
Fifty-four (!) hydrogen bonds stabilize the single supramolecular aggregate (1) formed from the cooperative selfassembly of ten molecules. Compound 1, designated as Hub-(MMM)3 · 9 neohex(CA) by the authors—conventional nomenclature and even the drawing of structural formulae are overtaxed—, further demonstrates the po…
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…