LINEAR SOLVATION ENERGY RELATIONSHIPS .3. SOME RE-INTERPRETATIONS OF SOLVENT EFFECTS BASED ON CORRELATIONS WITH SOLVENT PI-STAR AND ALPHA VALUES

Solvent polarity and hydrogen bonding effects on a number of physical and chemical properties and reaction parameters are unravelled and rationalized by means of the solvatochromic comparison method and equations of the form XYZ = XYZ0 + sπ* + aα, where π* is a measure of solvent polarity and α a measure of solvent hydrogen bond donor acidity. XYZ's considered include ET values for eight electronic spectral transitions, two sets of nitrogen hyperfine splitting constants, a set of fluorescence lifetimes, logarithms of rate constants for four nucleophilic substitution reactions, and the ' electrophilicity parameter,' E, of Koppel and Palm.