An outer-sphere electrontransfer is a reaction in which the electrontransfer takes place with no or very weak (4 -16 kJ mol-1) electronic interaction between the reactants in the transition state. If instead the donor and the acceptor exhibit a strong electronic coupling, the reaction is described as inner-sphere electrontransfer. The two terms derive from studies concerning metal complexes and it has been suggested that for organic reactions the term "nonbonded" and "bonded" electrontransfershould be used. See also inner-sphere electrontransfer. EBERSON (1987); LITTLER (19
