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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TL;DR: In this article, the formation of complexes between molybdenum(VI) and the ligands L-asparagine, Laspartic acid, L-alanine, 2,3-diketo-L-glutonic acid and L-threonic acid was described.
20 citations
TL;DR: Dithionite reduced azoferredoxin and molybdof deferredoxin from Clostridium pasteurianum W5 were oxidatively titrated with various electron acceptors and the potential of this MoFd half cell is so positive, the electrons removed during this oxidation may not be those that reduce dinitrogen.
20 citations
20 citations
TL;DR: In this article, the authors have shown that neutral, diamagnetic, seven-coordinate species with one of the diphosphine molecules acting as a monodentate ligand can be obtained.
Abstract: Complexes of the type MX2(CO)2 diphos2 [M = Mo, W; X = Cl, Br; diphos = bis(diphenylphosphino)methane] have been prepared and characterized. The complexes are neutral, diamagnetic, seven-coordinate species with one of the diphosphine molecules acting as a monodentate ligand. Nuclear magnetic resonance, conductance, and molecular weight studies support this view. The monomeric complex MoBr2(CO)3 diphos has also been prepared.
20 citations
TL;DR: Using the temperature-jumps relaxation technique the kinetics of complex formation between molybdate and 8-hydroxyquinoline have been studied and a reaction scheme for formation of the 1:1 complex is proposed which accounts for the observed pH dependence of the overall forward and backward rate constants.
Abstract: Using the temperature-jumps relaxation technique the kinetics of complex formation between molybdate and 8-hydroxyquinoline have been studied in the pH range 7.9–8.9. A reaction scheme for formation of the 1:1 complex is proposed which accounts for the observed pH dependence of the overall forward and backward rate constants. The specific rate constants evaluated are discussed in terms of the detailed reaction mechanism. Complex formation between molybdate and 8-hydroxyquinoline may be regarded as a model for the binding of substrate by the enzyme xanthine oxidase. This enzyme contains molybdenum which probably is involved in substrate binding. The experimental data are compatible with this hypothesis.
20 citations