Tricarbonyl hydride derivatives of cyclopentadienyl-chromium, -molybdenum and -tungsten compounds covalently linked to a macroreticular polystyrene support are obtained by treatment of polystyrene-attached cyclopentadienyl anions with the respective metal hexacarbonyl and subsequent acidification. In contrast to the ease with which unsupported cyclopentaruenyl·chromium and -molybdenum tricarbon...

Abstract: current densities. Electrochemical impedance spectroscopy (EIS) results showed that the codeposition mechanism oftungsten in Ni-W deposition is the reduction of tungsten oxide which changed to the reduction of tungsten-containingion complexes at higher current densities. In Co-W electrodeposition, the tungsten codeposition takes place viareduction of tungsten oxide, although, the role...

The reaction of hexachlorodisilazanyllithium (C13Si)2NLi (l) , with TiC14 leads selectively to the novel fully chlorinated amides (C13Si)&JTiC13 (2) or [(C1,Si)2N]2TiC12 (31, respectively, depending on the molar ratio of the starting materials. The analogous reaction of 1 with WC16 yielded the amide imide C13SiNW(Cl~)I\i(SiC1,), (5) by elimination of Sic&. The relative amounts of the starting m...

Tungsten (W) is an important and versatile transition metal has a firm place at the heart of many technologies. A popular experimental technique for characterization tungsten tungsten-based compounds x-ray photoelectron spectroscopy (XPS), which enables assessment chemical states electronic structure through collection core level valence band spectra. However, in case metal, open questions rema...

This study investigates the dissolution, sorption, leachability, and plant uptake of tungsten and alloying metals from canister round munitions in the presence of model, well characterized soils. The source of tungsten was canister round munitions, composed mainly of tungsten (95%) with iron and nickel making up the remaining fraction. Three soils were chosen for the lysimeter studies while fou...

Gonderman, Sean Robert. M.S.N.E., Purdue University, August 2014. Correlating Grain Size to Radiation Damage Tolerance of Tungsten Materials Exposed to Relevant Fusion Conditions. Major Professor: Jean Paul Allian. Tungsten remains a leading candidate for plasma facing component (PFC) in future fusion devices. This is in large part due to its strong thermal and mechanical properties. The ITER p...

BACKGROUND In recent years there has been an exponential increase in tungsten demand, potentially increasing human exposure to the metal. Currently, the toxicology of tungsten is poorly understood, but mounting evidence suggests that both the elemental metal and its alloys have cytotoxic effects. Here, we investigate the association between tungsten and cardiovascular disease (CVD) or stroke us...

An increasing number of potential applications for polyoxometalates in human medicine have been reported in the literature. These inorganic complexes are composed of early transition metals (mainly molybdenum, tungsten and vanadium) and oxygen. The present review gives an introduction into the chemistry of these compounds, and an overview of the principal studies of their biological and biochem...