An extension of the Kamlet–Taft basicity scale of solvents

Abstract

A critical analysis is given of currently popular scales of solvent Lewis basicity (Koppel–Palm, Paju–Koppel, and Gutmann) with particular consideration to and extension of the Kamlet–Taft scale, B_KT. Measurements for 22 new solvents were carried out and B_KT values for 70 solvents are reported. A rough agreement between B_KT and other parameters for solvent basicity has been found. A linear dependence of the Koppel–Palm E values with E_T was shown for solvents of higher polarity (E_T > 42).