title: Reactivity of silver clusters anions with ethanethiol.
abstract: We have investigated the gas-phase reactivity of silver clusters with ethanethiol in a fast-flow tube reactor. The primary cluster products observed in this reaction are AgnSH(-) and AgnSH2(-), indicating C-S bond activation, together with interesting byproducts H3S(-) and (H3S)2(-). Agn(-) clusters with an odd number of valence electrons (n = even) were observed to be more reactive than those with an even number of electrons-a feature previously only observed in the reactivity of Agn(-) with triplet oxygen, indicating that radical active sites play a role in their reactivity. Furthermore, the reactivity dramatically increases with large flow rate of ethanethiol being introduced in the flow tube. Theoretical investigations on the reactivity of Ag13(-) and Ag8(-) with ethanethiol indicate that both Ag13(-) and Ag8(-) face significant barriers to reactivity with a single ethanethiol molecule. However, Ag8(-) reacts readily in a cooperative reaction with two ethanethiol molecules, consistent with the dramatic increase in reactivity with a large flow rate. Further hydrogen-transfer reactions may then release an ethylene molecule or an ethyl radical resulting in the observed AgnSH(-) species.
authors.affiliation: State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China.
authors.forename: Zhixun
authors.initials: Z
authors.lastname: Luo
authors.forename: Gabriel U
authors.initials: GU
authors.lastname: Gamboa
authors.forename: Meiye
authors.initials: M
authors.lastname: Jia
authors.forename: Arthur C
authors.initials: AC
authors.lastname: Reber
authors.forename: Shiv N
authors.initials: SN
authors.lastname: Khanna
authors.forename: A W
authors.initials: AW
authors.lastname: Castleman