title: Gas-phase dehydrogenation of methanol with mononuclear vanadium-oxide cations.
abstract: The reactions of methanol with mass-selected V+, VOH+, VO+, and VO2(+) cations are studied by Fourier-transform ion-cyclotron resonance (FT-ICR) mass spectrometry in order to investigate the influence of the formal oxidation state of the metal on the reactivity of vanadium-oxide compounds. Interestingly, the most reactive species is the low-valent hydroxide cation VOH+, for which a formal condensation reaction prevails to afford VOCH3(+). In contrast, atomic V+ is oxidized and the high-valent dioxide cation VO2(+) is reduced by methanol. The dehydrogenation of methanol mediated by VO+ does not involve any change of the metal's oxidation state. For the latter reaction, the experimental results are complemented by a theoretical investigation by using density functional theory.
authors.affiliation: Institut für Chemie der Technischen Universität Berlin, Strasse des 17. Juni 135, 10623 Berlin, Germany.
authors.forename: Marianne
authors.initials: M
authors.lastname: Engeser
authors.forename: Detlef
authors.initials: D
authors.lastname: Schröder
authors.forename: Helmut
authors.initials: H
authors.lastname: Schwarz