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Science 9 November 2001:
Vol. 294. no. 5545, p. 1237
DOI: 10.1126/science.294.5545.1237f
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Most fundamental studies of the initial stages of ion solvation have focused on cations, whose small size promotes strong interactions with solvent molecules that facilitate the formation of small clusters. The larger size of anions has made similar studies more difficult. Wang et al. (p. 1322; see the Perspective by Stace) now report photoemission data for the aqueous solvation of two doubly charged anions, sulfate (SO42-) and oxalate (C2O42-), with between 4 and 40 water molecules. A gradual transition from anion features to solvent features as the number of water molecules in the cluster increases was observed, which suggests that the anion does not reside on the cluster surface but becomes solvated much like a species in bulk solution.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)