Binding Energies of O-2 and CO to Small Gold, Silver, and Binary Silver-Gold Cluster Anions from Temperature Dependent Reaction Kinetics Measurements

作者：Bernhardt Thorsten M^*; Hagen Jan; Lang Sandra M; Popolan Denisia M; Socaciu Siebert Liana D; Woeste Ludger

来源：Journal of Physical Chemistry A, 2009, 113(12): 2724-2733.

DOI：10.1021/jp810055q

A detailed analysis of experimentally obtained temperature-dependent gas-phase kinetic data for the oxygen and carbon monoxide adsorption on small anionic gold (Au-n(-), n = 1-3), silver (Ag-n(-), n = 1-5), and binary silver-gold (AgnAum-, n m = 2, 3) clusters is presented. The Lindemann energy transfer model in conjunction with statistical unimolecular reaction rate theory is employed to determine the bond dissociation energies E-0 of the observed metal cluster complexes with O-2 and CO. The accuracy limits of the obtained binding energies are evaluated by applying different transition-state models. The assumptions involved in the data evaluation procedure as well as possible sources of error are discussed. The thus-derived binding energies of O-2 to pure silver and binary silver-gold cluster anions are generally in excellent agreement with previously reported theoretical values. In marked contrast, the binding energies of O-2 and CO to Au-2(-) and Au-3(-) determined via temperature-dependent reaction kinetics are consistently lower than the theoretically predicted values.

• 出版日期2009-3-26