Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

80 correlations have been carried out between the medium-induced changes in equilibrium and kinetic data (Y) and the medium-induced changes in positions of maxima in electronic (both absorption and fluorescence) spectra (Δν) of the Kamlet-Taft type indicators. The correlations have been carried out by means of the equations Y=Y₀ + k . Δν and Y=Y₀ + k' . Δν/f(n²) using only the Kamlet-Taft select solvents (SSS). The equation involving the function of refreactive index (n), f(n²) = (n² - 1)/(2n² + 1), is better than the simple relation between Y and Δν in 93% of the systems studied. The problem of HBD acidity of nitromethane and the relation of the A and B solvent characteristics by Swain and the characteristics of dipolarity of medium by Kamlet-Taft are discussed.