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Book ChapterDOI

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
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Journal ArticleDOI
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

Journal ArticleDOI
Russ Hille1
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

Journal ArticleDOI
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

Journal ArticleDOI
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

Journal ArticleDOI
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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Journal ArticleDOI
TL;DR: In this article, the structure of molybdenum oxide tetrafluoride was refined by three-dimensional least-squares methods, the final R being 0·102 for 1909 independent reflections.
Abstract: Crystals of molybdenum oxide tetrafluoride are monoclinic, space group P21/c, a= 5·50, b= 16·98, c= 7·84 A, β= 91·7°. The structure was refined by three-dimensional least-squares methods, the final R being 0·102 for 1909 independent reflections. In the crystal, octahedrally co-ordinated units are linked into endless chains by cis-bridging fluorine atoms. The fluorine bridge is asymmetric, but the octahedra formed by the light atoms are almost undistorted, with the molybdenum atoms displaced from the centres of these octahedra, towards the terminal oxygen atoms.

32 citations

Journal ArticleDOI
TL;DR: The Saureanhydrid-Komplexe sind auch aus MoO3 and dem Saurechlorid zuganglich; eine weitere allgemeine Darstellungsmethode beruht auf dem nachtraglichen Austausch der organischen Liganden as mentioned in this paper.
Abstract: Aus MoO2Cl2 und elektroneutralen, organischen Liganden (Saureanhydride, Saureester, Ather, Ketone, Aldehyde, Nitrile) wurden Komplexe der allgemeinen Formel MoO2Cl2Lig2 hergestellt. Die Saureanhydrid-Komplexe sind auch aus MoO3 und dem Saurechlorid zuganglich; eine weitere allgemeine Darstellungsmethode beruht auf dem nachtraglichen Austausch der organischen Liganden. — Die neu aufgefundenen Substanzen bilden farblose, sehr feuchtigkeitsempfindliche Kristalle; in Benzol sind sie mit einfachem Formelgewicht ohne Dissoziation loslich. Auf Grund von IR-Spektren und Dipolmessungen kommt den Verbindungen eine Dipolkomplex-Struktur der Koordinationszahl 6 zu. — Die Untersuchungen der schon langer bekannten, als MoO3·2 HCl und MoO2(OCH3)2 aufgefasten Substanzen ergab fur die erstere die Struktur eines Molybdanylchlorid-hydrats MoO2Cl2·H2O, die zweite erwies sich als Alkoholat MoO3· 2 CH3OH.

32 citations

Journal ArticleDOI
TL;DR: In this paper, the Elektronenabsorptionsspektren in wäßer Lösung were gemessen and Näherungswerte für die Oszillatorenstärken angegeben.
Abstract: Von MoSi~ una WSt2~ werden die Elektronenabsorptionsspektren in wäßriger Lösung gemessen und Näherungswerte für die Oszillatorenstärken angegeben. Ein Vergleich der Spektren von MoO£~ und WO^~ einerseits und MoSl1~ und WSi2~ andererseits legt es nahe, daß in den Thioanionen -Bindungen vorliegen, wie von verschiedenen Autoren für die Oxoanionen gefordert worden ist. Eine grobe Abschätzung der Bindungsgrade nach Siebert ergibt den gleichen Sachverhalt. Wir haben uns in einigen Arbeiten mit schwingungsspektroskopischen Untersuchungen von Oxound Thioanionen befaßt1-9. Uns interessierte dabei u.a. die Frage, ob in den Thioanionen, wie auch

32 citations