The electrostatic and non-electrostatic contributions of solvent to Eyring-Laidler equation ( 1 ) were discussed in the solvent effect of the quaternization of pyridine with dodecyl bromide. The rate constant, log k, showed better correlation with solubility parameter, 8, than with D-1/2 D+1. The linear relations were observed respectively among the aliphatic alcohols and the aprotic solvents except tetrahydrofuran, dioxane and benzene. Similar relations were observed for the plots of ET vs. log k and E vs.4S. These results indicate the importance of the mode of solvent-solute interactions as well as the electrostatic and non-electrostatic factors in the solvent effect.

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