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Substitution of O with a Single Au Atom as an Electron Acceptor in Al Oxide Clusters
journal contribution
posted on 2020-09-02, 08:29 authored by Fumitaka Mafuné, Xinan Liu, Yufei Zhang, Satoshi KudohAl atoms generally adopt the +3 oxidation
state and form stoichiometric
oxides such as Al2O3 in the bulk phase. Among
small cationic gas-phase clusters, near-stoichiometric clusters such
as Al3O4+, Al3O5+, Al4O6+, Al4O7+, Al5O7+, and Al5O8+ have been readily generated
in experimental studies. However, when a single Au atom was included
in the clusters, oxygen-deficient clusters such as AuAl4O5+ were formed in high abundance; in these
clusters, the Au atom accepted electron density from the Al atoms.
The geometrical structures and atomic charges in the clusters suggest
that a single Au atom can substitute for O atoms in Al oxide clusters.
This propensity originates from the high electron and low oxygen affinities,
which, together, constitute an unusual property of Au.
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