THE SOLVATION DYNAMICS OF $Ni^{+} (H_{2}O)_{n}$ CLUSTERS STUDIED BY INFRARED PHOTODISSOCIATION SPECTROSCOPY
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Date
2004
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Ohio State University
Abstract
Infrared photodissociation spectra of mass-selected $Ni^{+} (H_{2}O)_{n}$ clusters are reported for $n=3-25$ complexes. The clusters fragment by the loss of one or more intact water molecules and their spectra show distinct bands in the region of the symmetric and asymmetric stretches of water $(3657 cm^{-1}, 3756 cm^{-1})$. A broad feature appears to the red of the O-H region due to hydrogen bonding at a specific cluster size $(n=4)$, indicating the onset of solvation. At larger cluster sizes, the red-shifted feature becomes more dominant and the symmetric O-H stretch loses its intensity until it is not observed at all. The data indicate that as cluster size increases, the water molecules are included in the hydrogen-bonded network and beginning with $Ni^{+} (H_{2}O)_{1}0$, the complexes resemble water clusters contaminated with a single metal atom.
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Author Institution: Department of Chemistry, University of Georgia