Mode of adsorption of (CH 3) 2Au(acac) onto partially dehydroxylated silica

Miyako Hisamoto, Ryan C. Nelson, Ming Yung Lee, Juergen Eckert, Susannah L. Scott

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The deposition of volatile cis-(CH 3) 2Au((O, O'-acac) onto silica partially dehydroxylated at 400 °C leads to molecular dispersion of the organogold complex. X-ray absorption near-edge structure demonstrates that the gold retains its oxidation state upon binding. IR and 1H magic-angle spinning NMR spectra suggest that the molecular framework also remains intact. Computational models involving hydroxyl-terminated octasilses-quioxane cube clusters to represent silica predict the most energetically favorable interaction to be hydrogen-bonding between two surface hydroxyls and the oxygen donor atoms of the chelated acetylacetonate ligand. This mode of adsorption was confirmed by analysis of the IR and the Au L III edge extended X-ray absorption fine structure. The surface hydroxyls most likely to participate in the attachment of the gold complex to silica are vicinal silanol pairs that are not involved in hydrogen bonding to other silanols.

Original languageEnglish
Pages (from-to)8794-8805
Number of pages12
JournalJournal of Physical Chemistry C
Volume113
Issue number20
DOIs
StatePublished - May 21 2009

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