Chemistry

Going for the Gold Cluster

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Science  14 Mar 2003:
Vol. 299, Issue 5613, pp. 1627-1629
DOI: 10.1126/science.299.5613.1627e

Gold nanoclusters can exhibit much greater reactivity than the bulk metal, especially when they are supported on oxides that can transfer negative charge to the clusters. Their reactivity can also differ from that of platinum group metals. For example, the latter normally dissociate O2 in oxidation reactions, whereas several studies indicate that the active species on gold clusters is molecular in character. To identify the activated species, Stolcic et al. have performed photoelectron spectroscopic studies of the interaction of mass-selected, gas-phase, gold cluster anions (Aun) with O2. At least for very small clusters (Au2 and Au4), the photoelectron spectra show vibrational fine structure indicative of bound superoxo (O2) and peroxo (O22-) species, respectively. — PDS

J. Am. Chem. Soc. 10.1021/ja0293406 (2003).

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