The Coordination and Bioinorganic Chemistry of Molybdenum
09 Mar 2007-pp 1-223
About: The article was published on 2007-03-09. It has received 78 citations till now. The article focuses on the topics: Bioorganometallic chemistry & Bioinorganic chemistry.
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TL;DR: The 2011 WHO Guidelines for Drinking-Water Quality (fourth edition) advised a health-based value of 70μg/L for Mo but this is no longer promulgated as a formal guideline value as WHO consider such concentrations to be rarely found in drinking water as discussed by the authors.
196 citations
TL;DR: An overview of the current state of our understanding of the molybdenum-containing enzyme xanthine oxidoreductase is presented, with an emphasis on work done in the past five years.
Abstract: An overview of the current state of our understanding of the reaction mechanism of the molybdenum-containing enzyme xanthine oxidoreductase is presented, with an emphasis on work done in the past five years Recent studies of the biosynthesis of the pterin cofactor bound to the metal in the active site are also reviewed, as is crystallographic work that has clarified the coordination geometry of the molybdenum center This structural work provides the context in which to understand recent mechanistic studies of the enzyme, in particular those aimed at elucidating the role of specific amino acid residues in the active site of the enzyme(© Wiley-VCH Verlag GmbH & Co KGaA, 69451 Weinheim, Germany, 2006)
119 citations
TL;DR: In this article, synthetic aspects of molybdenum sulfide-based materials were reviewed, with emphasis on the catalytic materials, and a number of preparation methods were critically compared, including molecular precursor decomposition, hydrothermal, soft chemistry aqueous, surfactant-aided, intercalation-exfoliation, and solid gas reactions.
114 citations
TL;DR: The ability of Desulfovibrio desulfuricans formate dehydrogenase (DdFDH) to reduce carbon dioxide was kinetically and mechanistically characterized and a kinetic model of a hysteretic enzyme is proposed to interpret and predict the progress curves of the Dd FDH-catalyzed reactions.
Abstract: Carbon dioxide accumulation is a major concern for the ecosystems, but its abundance and low cost make it an interesting source for the production of chemical feedstocks and fuels. However, the thermodynamic and kinetic stability of the carbon dioxide molecule makes its activation a challenging task. Studying the chemistry used by nature to functionalize carbon dioxide should be helpful for the development of new efficient (bio)catalysts for atmospheric carbon dioxide utilization. In this work, the ability of Desulfovibrio desulfuricans formate dehydrogenase (Dd FDH) to reduce carbon dioxide was kinetically and mechanistically characterized. The Dd FDH is suggested to be purified in an inactive form that has to be activated through a reduction-dependent mechanism. A kinetic model of a hysteretic enzyme is proposed to interpret and predict the progress curves of the Dd FDH-catalyzed reactions (initial lag phase and subsequent faster phase). Once activated, Dd FDH is able to efficiently catalyze, not only t...
103 citations
TL;DR: The mesoporous molecular sieve MCM-41 was covalently grafted with 3-aminopropyl trimethoxysilane (AmpMCM41) in this article.
Abstract: The mesoporous molecular sieve MCM-41 was covalently grafted with 3-aminopropyl trimethoxysilane to give aminopropyl modified MCM-41 (AmpMCM-41). Reaction of this material with furfural, pyrrolcarbaldehyde, 2-acetylpyrrol, 2-aminoacetophenone, salicylaldehyde and acetylacetone afforded the corresponding supported Schiff base ligands. Subsequent reaction with bis(acetylacetonato)dioxomolybdenum(VI) leads to various molybdenum complexes supported on MCM-41 through propyl chain spacer. Characterization of these materials was carried out with FT-IR, atomic absorption spectroscopy, powder X-ray diffraction (XRD) and BET nitrogen adsorption–desorption methods. The XRD and BET analyses revealed that textural properties of support were preserved during the grafting experiments. The resultant materials successfully catalyzed the epoxidation of cyclooctene, cyclohexene, 1-hexene and 1-octene with tert -butyl hydroperoxide (TBHP) to the corresponding epoxides with 98–100% selectivities.
92 citations
References
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38 citations
TL;DR: Highly purified molybdoferredoxin, with a specific activity of 2.6 mumoles of acetylene reduced per min per mg of protein, was obtained from Clostridium pasteurianum and a method for the isolation of the protein subunits is described.
Abstract: Highly purified molybdoferredoxin, with a specific activity of 2.6 μmoles of acetylene reduced per min per mg of protein, was obtained from Clostridium pasteurianum. The protein at concentrations above 5 mg/ml exists in solution as a tetrameric complex with two subunits each of about 60,000 and 50,000 daltons. Two atoms of molybdenum are present per protein molecule of 220,000 daltons. The S020, w was found to be 10.5. The tetramer dissociates into a dimer as demonstrated by a decreasing sedimentation coefficient with decreasing protein concentration. At low pH and ionic strength, further dissociation into the monomers is achieved. A method for the isolation of the protein subunits is described.
38 citations
TL;DR: A dissimilatory nitrate reductase from Thiobacillus denitrificans utilizes sulphite as an electron donor, with a pH optimum at 8.5.
38 citations
TL;DR: Complexes of molybdenum and tungsten containing the ligands N2H, N 2H2 and N2 H3, probably represent intermediate stages in the reduction of ligating dinitrogen to ammonia.
38 citations
TL;DR: In this paper, the ultraviolet, visible and infra-red spectra of the compounds Ba(MoO 2 C 2 O 4 ) 2 5H 2 O and K(Mo O 2C 2O 4 )2·5 H 2 O have been measured and their magnetic moments determined, showing that the complex anion is dimeric in the solid and in solution.
38 citations