Elucidating chemical and morphological changes in tetrachloroauric solutions induced by X-ray photochemical reaction

Qing Ma*, Ralu Divan, Derrick C. Mancini, Denis T Keane

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Chemical and morphological changes induced by an X-ray photochemical reaction in tetrachloroauric solutions leading to Au3+-to-Au 0 reduction are monitored in real time by X-ray absorption spectroscopy and X-ray small angle scattering. Prior to metal precipitation, the intermediate state, also observed by other techniques, is unambiguously determined for the first time to be the reduction of Au3+ to Au 1+, whose kinetics is strictly of the zeroth order. The morphological changes occur simultaneously in the solutions, that is, the gold complexes rearrange and aggregate, as unequivocally observed by the correlated changes in the Au L3 emission and small angle scattering intensities. The experimental evidence indicates that the eventual metal precipitation is strongly influenced by the changing solution acidity under X-ray irradiation. Detailed local structure changes are also described.

Original languageEnglish (US)
Pages (from-to)4568-4572
Number of pages5
JournalJournal of Physical Chemistry A
Volume112
Issue number20
DOIs
StatePublished - May 22 2008

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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