Mechanistic aspects of outer-sphere reduction of CoIII(en)2(Br)(L)2+ (LÂ =Â RC6H4NH2) complexes in binary solvent mixtures: A critical and quantitative assessment of linear free energy relations

Rate constant of electron transfer increases in the reaction; CoIII(en)2(Br)(L)2++Fe(CN)64-↔{COIII(en)2(Br)(L)2+;Fe(CN)64-}→products (L = RC6H4NH2) in binary solvent mixtures. A transition state stabilized by hydrogen bonding is as shown. This reactivity scheme can be accounted using vigorous statistical model equation of the form; YS=Y0+∑i=1naiXi.