Infrared spectroscopy of hydrated sulfate dianions.
We report the first infrared spectra of multiply-charged anions in the gas phase. The spectra of SO(4) (2-)(H(2)O)(n), with n=3-24, show four main bands assigned to two vibrations of the dianionic core, the water bending mode, and solvent libration. The triply degenerate SO(4) (2-) antisymmetric stretch vibration probes the local solvent symmetry, while the solvent librational band is sensitive to the hydrogen bonding network. The spectra and accompanying electronic structure calculations indicate a highly symmetric structure for the n=6 cluster and closure of the first solvation shell at n=12.
Zhou
Jia
J
Department of Chemistry, University of California, Berkeley, California 94720, USA.
Santambrogio
Gabriele
G
Brümmer
Mathias
M
Moore
David T
DT
Wöste
Ludger
L
Meijer
Gerard
G
Neumark
Daniel M
DM
Asmis
Knut R
KR