Abstract
Vibrational spectra and 7Li, 13C and 35Cl
n.m.r. spectra have been obtained for solutions of LiClO4 in acetone
for salt concentrations from 0.05 to 6 M. Infrared spectra give qualitative
indications of ion association. Analysis of the Raman band due to C-C
stretching in acetone yields solvation numbers for
the Li+ ion of the order of 3. Component band analysis of the ClO4-
symmetric stretching vibrational band and the various
n.m.r. spectra lead to the identification of solvent-separated ion pairs,
contact ion pairs and ion aggregates, in addition to free solvated ions. The
dependence on salt concentration of all four species has been determined. The
association quotient for the association equilibrium
(Li+)s(ClO4)- ↔
[Li+(acetone)ClO4-)s
was determined to be 1.4 � 0.3
dm3 mol-1.
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