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Showing 1 to 20 of 2053 for “"VI"”.
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Synthesis and reactivity of organometallic nitridoosmium(VI), ruthenium(VI) complexes
New organometallic osmium(VI) complexes with sulfur and oxygen containing ligands, (Os(N)(CH$\sb2$SiMe$\sb3)\sb2$Y) $\sp-$ $\{$Y = (SCH$\sb2$CH$\sb2$S), (SCN)$\sb2$, (S), (S-C$\sb5$H$\sb4$N), (WS$\sb4$), (MoS$\sb4$), (SO$\sb4$), (CO$\sb3$), (ReO$\sb4)\sb2\}$ were prepared. Two crystal structures of …
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Synthesis and Reactivity of ruthenium(VI) and osmium(VI) Nitrido and Imido Complexes
Reaction of [N(n-Bu)4][M(N)Me4] with Me3SiOSO2CF3 yielded the neutral complexes Os(NSiMe3)Me4 and Ru(NSiMe3)Me4. These complexes reacted with water to generate Me3SiOH, CH 4, (Me3Si)2O and insoluble metal-containing species. Both reacted with carbon monoxide to form acetone derived from the alkyl …
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Chiral Organometallic osmium(VI) Nitrido Complexes
The chiral-at-metal complex [Os(N)(CH2SiMe3)MeCl 2]- forms in a reaction of a mixed tetraalkyl osmium nitrido complex with pyridinium chloride. Reactions between Ag2CrO 4 and [Os(N)(CH2SiMe3)MeCl2] - or [Os(N)(CH2SiMe3)PhCl2] - give chiral-at-metal heterobimetallic complexes that catalyze the …
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Isotopic fractionation of chromium and uranium during Cr(VI) reduction by ascorbate and U(VI) reduction by sulfide
… conditions which control their chemical behavior in near surface settings. Reduction of hexavalent chromium (Cr(VI)) and uranium (U(VI)) greatly decreases their solubility and mobility, and therefore their toxicity in groundwater. Redox transformations have been shown to induce predictable …
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Isotopic fractionation of chromium and uranium during abiotic and microbial Cr(VI) reduction and microbial U(VI) reduction
Reduction of hexavalent chromium (Cr(VI)) influences the chemical behavior of Cr in a variety of geochemical settings such as ancient and modern oceans, lakes and groundwater and surface water systems. Cr(VI) reduction immobilizes the toxic form of Cr to less toxic and insoluble Cr(III). Several …
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Platelet Receptor Glycoprotein VI in Ischaemic Stroke
… that platelet surface receptor glycoprotein (GP) VI-dimer binds to exposed sub-endothelial collagen, initiating the signalling required to cause platelet activation. Then, separate platelet-fibrin interactions cause the thrombus to grow, culminating in distal tissue ischaemia; crucial in …
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Synthese, Stereochemie und Eigenschaften einiger organischer Tellurate(VI)
2 known and 15 new organic tellurates(VI) were synthesised starting from Te(OH)6. Their stereochemistries were investigated by spectroscopic methods (IR, UV, CD, MCD, NMR, MS) and by X-ray analysis. Orthotellurates Te(OAlk)6 Alk = Me, Et and the binuclear tellurate [(EtO)5Te]2O were made by …
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Estudio de la enfermedad del rey Fernando VI.
Fernando VI fue rey de España entre 1746 y 1759. Durante su último año de reinado, Fernando VI fue perdiendo de manera rápidamente progresiva sus capacidades mentales y se recluyó en el castillo de Villaviciosa de Odón hasta su muerte el 10 de agosto de 1759. Ese periodo de tiempo entre agosto de …
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Surface studies of group IV-VI layered crystals
… photoemission spectroscopy. Excitation is provided by He I (21.2 eV) and He II (40.8 eV) ultraviolet radiation. The results indicate that TiSe2 a semimetal with a band overlap of less than 0.25 eV, while TiSi2 a semiconductor. These measured bands are in good agreement with recent theoretical …
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Solubility and speciation of plutonium(VI) with orthophosphate
Pu(VI) speciation and solubility with phosphate was examined at pH from 0.3 to 12.2, Pu(VI) concentrations from 5 $\times\ {\rm 10}\sp{-5}$ M to 1.3 $\times\ {\rm 10}\sp{-3}$ M and phosphate concentrations up to 0.6 M. Absorption spectroscopy, solubility experiments, scanning electron microscopy …
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Oxo, imido, and nitrido compounds of osmium(VI)
… of isoelectronic alkyl complexes of osmium(VI), n-butylammonium nitridotetrakis-(trimethylsilylmethyl)osmium, methylimidotetrakis(trimethylsilylmethyl)osmium, and Os(O)(CH$\sb2$SiMe$\sb3$)$\sb4$ are compared. The nitrido complex does not react with carbon monoxide while both the methyl imide …
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Characterization and device applications of II-VI nanocomposites
… transparent polymers and ZnS, and possible device applications of the resulting luminescent materials. The crystalline structure of these quantum dots is examined using XRD. The nature of the core-shell interface is inferred by comparison of the XRD spectra with calculated spectra and in …
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Synthesis and Characterization of Magnetic II-VI Nanoparticles
… present a synthesis route to grow colloidal II-VI magnetic nanoparticles at room temperature with easily handled, relatively non-toxic source materials. CoSe and CrSe nanocrystals were synthesized in an aqueous solution where gelatin is used to retard the reaction. Characterization of the …
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Cr(VI) Generation and Stability in Drinking Water
The current US Environmental Protection Agency (USEPA) maximum contaminant level (MCL) for total chromium of 100 ppb is under revision to consider a specific level for Cr(VI), which has a proposed MCL of 10 ppb in California. Cr(VI) is a suspected carcinogen, and interconverts with the other most …
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Preparation and characterisation of poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads for the chromium (VI) (Cr(VI) removal
… have been developed for the removal of Chromium (VI) (Cr(VI)) from wastewater. In this study, blend polymer absorbent beads which was poly (vinyl alcohol)/chitosan/silicon dioxide (PVA/CS/SiO2) beads were prepared by dropwise method by crosslinking with sodium hydroxide and ethanol and further …
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Royal Self-Fashioning: King James VI and his Demonology
… period. This dissertation examines King James VI’s Daemonologie as it relates to the themes of masculinity and self-fashioning. By analysing James, through his demonological treatise, I illuminate James’s anxiety of the learned man and show his masking of that anxiety through textual …
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