title: Water-induced adsorption of carbon monoxide and oxygen on the gold dimer cation.
abstract: It is demonstrated, using tandem mass spectrometry and ion trap, that preadsorption of a H2O molecule on the gold dimer cation, Au2(+), enhances adsorption of CO and O2 molecules, which is otherwise inert toward these molecules. The rate of adsorption of CO on Au2(H2O)(+) was found to be higher by 2 orders of magnitude relative to bare Au2(+). The enhancement of the CO adsorption rate is due to the presence of a reaction channel, which cleaves the Au-Au bond, leading to the formation of Au(H2O)(CO)(+). Such an observation can be attributed to weakening of the Au-Au bond upon adsorption of a water molecule. Further, it was also observed that preadsorption of H2O leads to dramatic enhancement of O2 adsorption on the Au2(+) ion, which can be attributed to the changes in the electron density following water adsorption.
authors.affiliation: Department of Chemistry, Graduate School of Sciences, Kyushu University , 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ito
authors.forename: G Naresh
authors.initials: GN
authors.lastname: Patwari
authors.forename: Masashi
authors.initials: M
authors.lastname: Arakawa
authors.forename: Akira
authors.initials: A
authors.lastname: Terasaki