CLEAVAGE ENERGIES OF NITROGEN HYDROGEN-BONDS IN PARASUBSTITUTED ACETOPHENONE SEMICARBAZONES AND CORRESPONDING RADICAL IONS

BDE, pK(a)(HA+), BDE(HA-) and DELTAG(H)- (A.) for para-substituted acetophenone semicarbazones were estimated from thermodynamic cycles by combining their equilibrium acidities [pK(a)(HA)] with the appropriate electrode potential data [E(ox)(HA), E(rd)(HA) and E(ox)(A-)]. The results were discussed in terms of the substituent effects.