Depolarized Rayleigh scattering and orientational relaxation of molecules in solution. III Carboxylic acids

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Abstract
Depolarized Rayleigh linewidths have been measured for several carboxylic acids dissolved in carbon tetrachloride and water. The correlation times derived from the spectra are determined mainly by over-all molecular reorientation and are relatively insensitive to molecular internal rotations and changes in chemical state. The dependence of the reorientational correlation times on intermolecular interactions such as hydrogen bonding and chemical effects such as dimerization is studied. It has also been found that the polarized and depolarized Rayleigh spectra are insensitive to the rate of the reaction CF3COOH⇄CF3COO− + H+ in aqueous solutions of CF3COOH.