Molybdenum and tungsten oxidoreductase model chemistry

Molybdenum incorporation in tungsten aldehyde oxidoreductase enzymes from Pyrococcus furiosus.

The hyperthermophilic archaeon Pyrococcus furiosus expresses five aldehyde oxidoreductase (AOR) enzymes, all containing a tungsto-bispterin cofactor. The growth of this organism is fully dependent on the presence of tungsten in the growth medium. Previous studies have suggested that molybdenum is not incorporated in the active site of these enzymes. Application of the radioisotope (99)Mo in met...

Redox Chemistry of Tungsten and Iron-Sulfur Prostetic Groups in Pyrococcus furiosus Formaldehyde Ferredoxin Oxidoreductase

High oxidation state coordination chemistry with triamidoamine tungsten and molybdenum complexes

In this lecture I will focus on some recent developments in the chemistry of high oxidation state dinitrogen complexes with an emphasis on recent results involving triamidoamine molybdenum complexes. The heterogeneous iron-catalyzed Haber-Bosch reduction of dinitrogen to ammonia at relatively high pressures (200-400 atm) and temperatures (350-650OC) was the f is t and most dramatic man-made cat...

Comparison of doped combination zirconium-tungsten, zirconium- molybdenum and molybdenum-tungsten on single-wall vanadium oxide nanotube in hydrogen gas adsorption

In this study, doped vanadium oxide nanotubes were evaluated using different software to study the absorption of hydrogen gas. Vanadium oxide nanotubes are one of the options for absorption and storage hydrogen gas. In this research study for the first time, the Monte Carlo simulation was used to investigate the hydrogen gas absorption behavior in molybdenum-tungsten, molybdenum-zirconium and z...

Fundamental Studies of Molybdenum and Tungsten Methylidene and Metallacyclobutane Complexes

Addition of ethylene to Mo(NAr)(CHCMe2Ph)(OHIPT)(Pyr) (NAr = N-2,6-i-Pr2C6H3, OHIPT = O-2,6-(2,4,6-i-Pr3C6H2)2C6H3, Pyr = NC4H4) led to the trigonal bipyramidal metallacyclobutane complex, Mo(NAr)(C3H6)(OHIPT)(Pyr), in which the imido and aryloxide ligands occupy axial positions. Mo(NAr)(C3H6)(OHIPT)(Pyr) loses ethylene to give isolable Mo(NAr)(CH2)(OHIPT)(Pyr). W(NAr)(CH2)(OTPP)(Me2Pyr) (OTPP ...