Theoretical studies of Broensted relations

Using the general approach begun by Amon and Levine but making some important modifications, the authors analyze the dependence of the free energy of activation (..delta..G/sup + +/) on the standard free energy change (..delta..G/sub 0/). They find that the Broensted coefficient is usually not 1/2 for a reaction in which ..delta..G/sub 0/ = 0 (such a reaction is referred to as an isergonic reaction), and the functional dependence of ..delta..G/sup + +/ on ..delta..G/sub 0/ may be complicated. Since transition-state bond order for isergonic reactions are 1/2, this work indicates that, in general, the Broensted coefficient is not equal to the transition-state bond order. 29 references, 2 figures.