Intrinsic Gas-Phase Reactivity toward Methanol of Trinuclear Tungsten W3S4 Complexes Bearing W−X (X = Br, OH) Groups
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- 作者：Cristian Vicent ; Marta Feliz ; Rosa Llusar
- 刊名：Journal of Physical Chemistry A
- 出版年：2008
- 出版时间：December 11, 2008
- 年：2008
- 卷：112
- 期：49
- 页码：12550-12558
- 全文大小：313K
- 年卷期：v.112,no.49(December 11, 2008)
- ISSN：1520-5215
文摘
Electrospray ionization (ESI) tandem mass spectrometry is used to investigate the gas-phase dissociation of trinuclear sulfide W3S4 complexes containing three diphosphane ligands and three terminal bromine atoms, namely, [W3S4(dmpe)3(Br)3]+ (1+) or hydroxo groups, [W3S4(dmpe)3(OH)3]+ (2+) (dmpe = 1,2-bis(dimethylphosphanyl)ethane). Sequential evaporation of two diphosphane ligands is the sole fragmentation channel for the 1+ cation that yields product ions with one or two unsaturated W−Br functional groups, respectively. Conversely, evaporation of one diphosphane ligand followed by two water molecules is observed for cation 2+. Complementary deuterium-labeling experiments in conjunction with computational studies provide deep insight into the thermodynamically favored product ion structures found along the fragmentation pathways. From these results, the formation of a series of cluster cations with WBr, WOH, and WO functional groups either on saturated or unsaturated metal sites is proposed. The effect of the properties of these cluster cations, among them chemical composition and coordinative saturation, on their reactivity toward methanol is discussed.