Isomers of Anionic Gold Oxide Clusters, AunO2-, Investigated by Thermal Desorption Spectrometry

Masato Yamaguchi, Fumitaka Mafuné

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Anionic gold oxide clusters, AunO2- (n = 2-5), were prepared by sequential O atom transfer reactions from N2O to Aun-. Response of the clusters to heat was investigated by gas-phase thermal desorption spectrometry and was compared with the behavior of AunO2- prepared by the reaction of Aun- with O2. No desorption of O2 was observed from Au4O2- prepared with N2O until 1000 K, but O2 desorbed from Au4O2- prepared with O2 at 500 K, indicating the formation of structural isomers. Theoretical calculations show that the most stable form of Au4O2-, which contains dissociated O atoms, is produced by oxidation with N2O and that the third most stable form of Au4O2-, which contains molecular O2, is produced by oxidation with O2. The desorption energy of O2 from Au5O2-, in which O2 is dissociatively chemisorbed on Au5-, was estimated from the temperature dependence of the cluster signal intensities. The experimentally determined desorption energies were consistent with the values obtained by theoretical calculation.

Original languageEnglish
Pages (from-to)8498-8503
Number of pages6
JournalJournal of Physical Chemistry C
Volume121
Issue number15
DOIs
Publication statusPublished - Apr 20 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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