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.
Citations
More filters
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
More filters
TL;DR: In this paper, the magnetic properties have been used to obtain estimates of the splitting of the 2T2g ground term due to ligand field components of lower symmetry, the spin-orbit coupling constant and an orbital reduction factor.
Abstract: The electronic spectra, and magnetic susceptibility measurements in the temperature range 80–300°K, are reported for tungsten(V) chloride and bromide. These data are also presented for a number of molybdenum and tungsten(V) oxyhalide complexes of the types [MOX5]2– and [MOX4]– and halide complexes MX6–. Some infrared and conductivity data are also reported. The species studied all have the d1 configuration, and values for 10Dq are derived from the spectra. The magnetic properties have been used to obtain estimates of the splitting of the 2T2g ground term due to ligand field components of lower symmetry, the spin–orbit coupling constant, and an orbital reduction factor. Term splittings of up to 2000 cm.–1, and substantial reductions in the free-ion spin–orbit coupling constant were observed. Existing spectral data have been extended to cover a wider wavelength range, and to provide extinction coefficients where possible. The suggested trimeric structure for the tungsten pentahalides is probably incorrect.
28 citations
TL;DR: In this article, the state of hexavalent molybdenum in aqueous solution has been studied by dialysis, electromigration and centrifugation, and it was found that molybenzum forms neither true colloids nor pseudocolloids in the pH region investigated and that in the region 1-2·5 and 5 in the form of anion HMoO4− present in the forms of nonissociated molecules, at pH between 2·5
28 citations
28 citations
TL;DR: A molybdenum-nitrogen complex was constructed from molecular nitrogen in this paper, which was the first time for molybordenum/nitrogen mixtures.
Abstract: A molybdenum–nitrogen complex has been prepared for the first time from molecular nitrogen.
28 citations
28 citations