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: The crystal and molecular structure of a series of oxo-molybdenun di-n-propyldithiocarbamates have been studied by X-ray diffraction methods as discussed by the authors.
Abstract: The crystal and molecular structure of a series of oxo-molybdenun di-n-propyldithiocarbamates have been studied by X-ray diffraction methods. The compounds studied were di(oxo-di-n-propyldithiocarbamato) molybdenum VI (A), μ-oxo-bis-(di(oxo-di-n-propyldithiocarbamato) molybdenum V) (B), and oxo-bis-di-n-propyldithiocarbamato molybdenum IV (C). Compound A is orthorhombic, space group Pbca, with eight molecules in a unit cell having dimensions a =16.577(3) A, b =18.771(3) A and c =13.702(2) A. The molybdenum V compound (B) crystallizes in the orthorhombic non-centrosymmetric space group Pca21, with four molecules in a unit cell having parameters a =19.605(6) A, b =13.491(3) A and c =16.342(4) A. The last compound (C) is triclinic, space group P1 with two molecules in the unit cell. Its crystal parameters are a =10.183(6) A, b =13.012(9) A, c =9.208(5) A' a =71.57(5)°, β =105.81(5)° and γ =81.82(5)°. The intensities were collected by counter techniques using MoKa radiation. All structures were refin...
61 citations
TL;DR: In this paper, a molybdenum-cysteinato-cysteine complex with trihydrate trihydrates was reported, which can be regarded as a model for molybdoflavo-protein enzymes.
Abstract: RECENT measurements of electron spin resonance1 have indicated that, in the reduced form of the molybdoflavo-protein enzyme xanthine oxidase, molybdenum(V) is coordinated with one or more sulphur atoms, probably ionized thiol groups of cysteine. Molybdenum–sulphur complexes have therefore attracted considerable interest as possible models for molybdenum in enzymes2. Although the chemistry of molybdenum–sulphur complexes is becoming well understood3, there has been little work on complexes with cysteine. Stability constants of complexes of molybdenum(V) and (VI) with cysteine have been reported4, but no complexes have been isolated. We now report the preparation and properties of a molybdenum(V)–cysteine complex, sodium di-μ-oxo-bis {oxo[cysteinato(2-)]aquomolybdate(V)} trihydrate, Na2 {Mo2O4[SCH2CH(NH2)CO2]2(H2O)2}3H2O, and discuss how far it can be regarded as a model for molybdenum in enzymes.
61 citations
61 citations
TL;DR: The Mo-Fe protein from bacteroids of soybean nodules has been purified to a high degree of homogeneity as judged by disc gel electrophoresis and ultracentrifugal analysis.
60 citations