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  • Analytical Chemistry and Spectroscopy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 28 (1990), S. 138-144 
    ISSN: 0749-1581
    Keywords: 2H, 13CO, C18O isotope shifts ; 51V shielding ; Carbonylvanadium complexes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The effects of one-bond and two-bond 2H, 13CO and C18O isotope shifts on 51V shielding in various carbonyl-Cp-vanadium complexes (Cp = n5-cyclopentadienyl) are reported and discussed with respect to the sensitivity of 51V shifts to bond extensions, and the rovibrationally averaged values of such bond extensions. These isotope effects provide some insight into the bonding situation in these complexes. It is shown that the rate-determining step in the reaction between V(CO)6 and C5H5D, which leads to CpV(CO)4, is not subject to a kinetic isotope effect. The deuterium solvent isotope effects on 51V shielding in [V(CO)6]- and [VO4]3- are also investigated.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 30 (1991), S. 148-167 
    ISSN: 0570-0833
    Keywords: Active sites ; Enzymes ; Vanadium ; Bioinorganic chemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vanadium is a trace element that plays an important, perhaps essential and general role in the regulation of enzymatic phosphorylations. Several forms of life, including the fly agaric toadstool (Amanita muscaria) and certain sea squirts (ascidians), are able to concentrate vanadium. In other organisms vanadium is part of the active site of some enzymes. Well-studied examples are the nitrogen-fixing bacterium Azotobacter and various seaweeds that use vanadate-dependent peroxidases to synthesize halogenated organic compounds. Despite its importance as a “biometal” both in primitive, prokaryotic organisms (Azotobacter) and in the highly organized ascidians, which represent an early stage in the evolution of vertebrates, the bioinorganic chemistry of vanadium is still in its infancy. Just as young, but undergoing explosive development, is the chemistry of model compounds for vanadium-containing biomolecules, a domain of the bioinorganic coordination chemist, who almost daily discovers compounds with new and surprising structural features. This article reviews this fascinating area of bioinorganic chemistry.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
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