title: Gas-phase experiments on Au(III) photochemistry.
abstract: Irradiation of AuCl(4)(-) and AuCl(2)(OH)(2)(-) in the gas-phase using ultraviolet light (220-415 nm) leads to their dissociation. Observed fragment ions for AuCl(4)(-) are AuCl(3)(-) and AuCl(2)(-) and for AuCl(2)(OH)(2)(-) are AuCl(2)(-) and AuClOH(-). All fragment channels correspond to photoreduction of the gold atom to either Au(II) or Au(I) depending on the number of neutral ligands lost. Fragment branching ratios of AuCl(4)(-) are observed to be highly energy dependent and can be explained by comparison of the experimental data to calculated threshold energies obtained using density functional theory. The main observed spectral features are attributed to ligand-to-metal charge transfer transitions. These results are discussed in the context of the molecular-level mechanisms of Au(III) photochemistry.
authors.affiliation: JILA, NIST and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, United States.
authors.forename: Jesse C
authors.initials: JC
authors.lastname: Marcum
authors.forename: Sydney H
authors.initials: SH
authors.lastname: Kaufman
authors.forename: J Mathias
authors.initials: JM
authors.lastname: Weber
mesh_terms: D005740:Gases / Q000737:chemistry; D017612:Gold Compounds / Q000737:chemistry*; D010777:Photochemistry; D011789:Quantum Theory
chemical_list: D005740:Gases; D017612:Gold Compounds