Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 126, Issue 26, Pages 8275-8283Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja0492945
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Hydration reactions of anionic aluminum oxide clusters were measured using a quadrupole ion trap secondary ion mass spectrometer, wherein the number of Lewis acid sites were determined. The extent of hydration varied irregularly as cluster size increased and indicated that the clusters possessed condensed structures where the majority of the Al atoms were fully coordinated, with a limited number of undercoordinated sites susceptible to hydrolysis. For maximally hydrated ions, the number of OH groups per Al decreased in an exponential fashion from 4.0 in All cluster to 1.4 in the Al-9 cluster, which was greater than that expected for a highly hydroxylated surface but less than that for solution phase alumina clusters.
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