A combined experimental and theoretical structural study of methanolated chloride anions has been conducted, utilizing infrared vibrational spectroscopy and ab initio electronic structure calculations. These results represent the first such study for an anion with a nonaqueous solvent. The principal question addressed is whether the cluster ions assume structures reflecting surface or interior solvated states. The vibrational spectra in the O–H stretching regions, for and calculated O–H vibrational bands for consistently indicate that the chloride anion undergoes surface solvation. The behavior is remarkably similar to that of hydrated anions (chloride, bromide, and iodide) with large polarizabilities. This suggests that the asymmetric hydration of these anions lies not necessarily in the nature of the solvent, but in the nature of the anion.
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