Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 56: Poster: Molecular Clusters
MO 56.3: Poster
Thursday, March 16, 2006, 16:30–18:30, Labsaal
Probing the Stepwise Solvation of the Sulfate Dianion: Gas Phase Infrared Spectroscopy of SO42−·(H2O)n Clusters (n=3–24) — •Gabriele Santambrogio1, Jia Zhou2, Mathias Brümmer1, Dave Moore2, Ludger Wöste1, Gerard Meijer3, Daniel M. Neumark2,4, and Knut R. Asmis3 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, D 14195 Berlin, Germany — 2Department of Chemistry, University of California, Berkeley, CA 94720, USA — 3Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany — 4Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
Hydrated sulfate dianions are of paramount importance in diverse branches of science. However, a microscopic, molecular level understanding of the nature of the solute-solvent interaction as well as the composition of the solvation shell has not yet been achieved. Here we report the first gas phase infrared spectra of multiple charged anions in general, namely of mass-selected SO42−·(H2O)n dianions (n=3–24) employing the infrared multiple photon dissociation technique in combination with radiation from the free electron laser FELIX. The infrared spectra (550–1800 cm−1) were measured in the region of the stretching and bending modes of the sulfate core as well as characteristic intra- and intermolecular water modes, allowing an unprecedented, atomic level insight into structure of the complex as well as the nature and strength of the underlying hydrogen bonding interaction.