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Abstract

Applicability of the Buckingham cross-term f(D,n²) = (D -1) (n² - 1)/(2D + 1) (2n² + 1) for evaluation of solvent shifts has been tested using 12 original and 4 published data sets concerning solvent effects in electronic spectra. The results are compared with correlation of the same data with the Bakshiev equation. Influence of the cross-term on the solvent shifts is dominant with the systems showing no direction change of the molecular dipole moment during excitation. Mutual dependence has been found between the cross-term and the Taft solvent factors π at the 90% significance level.