The Effect of Substitution on the Ionization Potentials of Free Radicals and Molecules Ⅰ. A New Set of Constants, the δK Values

摘要

Several new applications of ionization potentials are presented. Ionization potentials of certain molecules are quantitative measures of the effect of substitution on ionization potentials in general. Ionization potentials of amines seem to be a measure of an "absolute" Lewis base strength uncomplicated by steric effects. Using substituted amines as a standard, a new set of constants, the 8K values, has been calculated. 8k values quantitatively reflect the change in ionization potential with substitution. Comparison of 8k values for multiple substitutions definitely confirms the previously postulated "saturation" effects in the aliphatic series.