Raman linewidth study of molecular interactions in mixtures of hexafluorobenzene with benzene and with mesitylene

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Abstract
Raman linewidths have been measured at room temperature for the 560 cm−1 band of hexafluorobenzene, for the 991 cm−1 band of benzene, and for the 576 cm−1 band of mesitylene, in the pure liquids and in binary solutions. Linewidths have also been measured for the 799 cm−1 band of cyclohexane as a reference. Rotational diffusion constants for the tumbling motion of the molecular planes have been evaluated from the Raman linewidths. Experimental diffusion constants are compared with theoretical values calculated on the basis of the semi‐slip rotational diffusion model. Effects of molecular interactions of hexafluorobenzene with benzene or mesitylene on the rotational motion of molecules in solution are discussed.

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