A Theoretical Approach to the Dielectric Relaxation of Alcohol Solutions. II. The Effect of Dilution with Inert Solvents on the Principal Relaxation Times of Primary Alcohols

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Abstract
The concentration dependence of the principal relaxation times, τp, of primary alcohol/inert solvent solutions are analyzed based on the equation, τp=2(1+KxA)τH, where xA is the alcohol mole fraction, K the equilibrium constant corresponding to the formation of hydrogen bonded multimers, and τH the time constant characterizing the rotational activation process of the terminal OH groups of the multimers. By applying Eyring’s absolute rate theory to the activation process, we calculated τP as a function of temperature and alcohol concentration. The results reproduce quite well the τP values observed for the ethanol/cyclohexane, 1-hexanol/cyclohexane, and 1-propanol/benzene solutions.