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  • Inorganic Chemistry  (1)
  • Röntgenstrahlenaltenuierung
  • 1980-1984
  • 1975-1979  (1)
  • 1976  (1)
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  • 1980-1984
  • 1975-1979  (1)
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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surface Compounds of Transition Metals. XIV. Coordinatively Unsaturated Surface Compounds of Vanadium(III) on SilicagelVanadium(V) reacts with silicagel (aqueous impregnation, activation in O2 at 800°C) to a colourless highly dispersed surface compound, which can be reduced by CO to coordinatively unsaturated violet surface vanadium(III). Reoxydation with O2 forms a deep-blue surface peroxide under chemiluminescence; heat treatment at 300°C reconstitutes the original vanadium(V) surface compound with simultaneous loss of 1/2 O2.
    Notes: Vanadium(V) bildet bei wäßriger Dotierung und nachfolgender Aktivierung (O2, 800°C) auf Silicagel farblose, hochdisperse Oberflächenverbindungen, die sich mit CO zu koordinativ ungesättigtem, violettem Oberflächen-Vanadium(III) reduzieren lassen. Reoxydation mit O2 führt unter Chemilumineszenz zunächst zu einem tiefblauen Oberflächen-Peroxid , das beim Erwärmen auf 300°C unter Abgabe von 1/2 O2 vollständig in das ursprüngliche Vanadium(V) übergeht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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