Abstract
Lithium bromide and sodium iodide solutions in acetonitrile have been analysed by Rayleigh light scattering (RLS). Relative depolarized intensity (it r) measurements give the optical anisot- ropy of solvated ions as a function of the total solvation number ( n s = n ++ n −) and allow a lower limit of n sto he obtained. Depolarization ratio (ϱ n) measurements yield more precise determi- nations, for instance n +=5.2 for Li + and 6.4 for Na +, assuming n −=1 for Br − and l −. Infrared (IR) experiments lead to lower n + values for Li + (3–4). Higher values of n s in RLS can be due to the second shell of coordination beyond the cation which is not detected by IR absorption.
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