Effect of lithium halides on the characteristic vibrational frequencies of propanoic acid

Effect of Lithium Chloride and Bromide on ν(C=O) and δ(O-H) have been investigated. Ion solvent interactions are responsible for the shift of characteristic vibrational frequencies of pure propanoic acid in solution. As concentration of solution is increased the departure from respective frequencies for pure propanoic acid becomes less pronounced. A general decrease in vibrational frequencies is observed with rise in concentration, it is almost stabilized near saturation point.