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Structures of the thermotropic mesophases of lead(II) decanoate are reassigned following optical and X-ray diffraction studies. These results, and those of D.S.C., Raman and 207Pb N.M.R. spectroscopy, indicate formation of a lower temperature mesophase involving mainly increased lateral disorder, and a higher temperat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic complexes of indium(III): novel .mu.-hydroxo- and .mu.-oxo-bridged complexes. Crystal structures of [L4In4(.mu.-OH)6](S2O6)3.4H2O and [L2In2(CH3CO2)4(.mu.-O)].2NaClO4 (L = 1,4,7-triazacyclononane)Karl Wieghardt, Michael Kleine-Boymann, Bernhard Nuber, and Johanne…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. A. Swansiger; Summary Abstract: Tritium solubility in high purity beryllium. Journal of Vacuum…
Abstract Petrocalcic horizons occur in a number of soils formed from Cretaceous limestone in central and west Texas (Edwards Plateau land resource area). Microfabric and stable C isotope analyses confirmed that the indurated carbonate zones are mostly of pedogenic origin. Multiple lines of evidence indicate that the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanical properties of substituted polyacetylenesToshio Masuda, Ben Zhong Tang, Akira Tanaka, and Toshinobu HigashimuraCite this: Macromolecules 1986, 19, 5, 1459–1464Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1 May…
The pyrolytic decomposition of tetraethylorthosilicate (TEOS) has been used to deposit highly doped borophosphosilicate glass (BPSG) films. The experiments were carried out in a modified low pressure chemical vapor deposition furnace in the 620–680 °C range at a deposition pressure of 0.5 Torr. Trimethylborate and pho…
The needle-shaped frustules of the diatoms Thalassionema Grunow and Thalassiothrix Cleve et Grunow are furnished with uniquely structured areolae which appear as a row of depressions along each edge of the valve. In Thalassionema the areolae open freely outwards and are surmounted by one to three simple silica branche…
The interference of scalar optical Floquet-Bloch waves in periodically stratified media is discussed in detail. Two main types of interference are identified and fully analyzed: normal and exchange interference, producing, respectively, real and virtual spatial fringes. In the paper considerable use is made of a recip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetochemistry of copper(II): exchange interactions in catenated acetatodiamminebromocopperRichard L. Carlin, Klaas Kopinga, Olivier Kahn, and Michel VerdaguerCite this: Inorg. Chem. 1986, 25, 11, 1786–1789Publication Date (Print):May 1, 1986Publication History Published o…
Abstract Three hypotheses concerning the movement and retention of anions in forest soils were tested in a series of laboratory and field studies on two Tennessee Ultisols with mixed deciduous forest cover and two Washington Inceptisols, one with deciduous (red alder Alnus rubra Bong.) and one with coniferous [Douglas…
Chemical bonding and reaction of in situ deposited Ti on a series of polyimide surfaces have been investigated. X-ray photoelectron spectroscopy has been used to probe site specific information for bonding of various functional groups of polyimide molecules, while ultraviolet photoelectron spectroscopy has been applie…
Abstract Flexural properties of moldings made by Reaction Injection Molding (RIM), which are structural foams consisting of high density skin and low density core, were investigated by three‐point bending tests. Two failure modes were observed in bending tests of the moldings made by RIM, and they are classified as fo…
Photoelectron spectroscopy of adsorbed Xe (PAX) was used to characterize various Pt/TiO2 (100) surfaces on an atomic scale. The PAX data provide useful information on both geometrical and electronic states of various surface sites. For example, both Ar ion sputtering and high temperature annealing (850 °C) in vacuum p…
Among the first row transition metal oxides from V2O5 to ZnO, CuO was found to be the most easily reduced by hydrazine. CuO surfaces exposed to hydrazine at ∼10−6 Torr could be reduced to the metallic state at room temperature. Reduction kinetics, continuously measured at the surface using in situ x-ray photoelectron…
SUMMARY A Mg‐base Laves phase was investigated by high resolution electron microscopy (HREM). Linear defects found at terminations of stacking faults were classified into three groups. The first is a partial dislocation at a termination of a stacking fault, the second is a superposed partial dislocation which is defin…
The crystal structure of piperazinium hexadichlorocuprate (PHCC) has been determined. In this compound, the Cu(II) ions are arranged in zig-zag chains well separated from each other. As temperature is decreased from the ambient temperature, the magnetic susceptibility exhibits a maximum at T=15 K and then tends to zer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the hydrogen peroxide/sulfuric acid oxidation of mesoporphyrin. Synthesis of mesoporphyrindionesC. K. Chang and Weishih WuCite this: J. Org. Chem. 1986, 51, 11, 2134–2137Publication Date (Print):May 1, 1986Publication History Published online1 May 2002Published inissue 1…
Methyl acetyl phosphate is a competitive inhibitor of the reduction of acetoacetate by D-3-hydroxybutyrate dehydrogenase. The material also irreversibly inactivates the enzyme. The kinetics of the inactivation are consistent with methyl acetyl phosphate acetylating the conjugate base of a hydrogen bond donor. Protecti…
Abstract The pentagonal column (PC), consisting of MX 7 bipyramids sharing their equatorial edges with five MX 6 octahedra, is a structural feature frequently occurring in association with frameworks of the ReO 3 ‐type, where it enables accomodation of an anion deficiency. The present article discusses the geometry of…
The mechanisms by which porphyrins form metal complexes in nature are of interest because of the importance of both the iron complexes, the active sites of hemoproteins, and the magnesium complexes, the chlorophylls. Currently there is interest in using chelated radioactive metal isotopes as diagnostic imaging and the…