https://doi.org/10.1351/goldbook.O04351
An outer-sphere @[email protected] is a reaction in which the @[email protected] takes place with no or very weak (\(4-16\ \text{kJ mol}^{-1}\)) electronic interaction between the reactants in the @[email protected] If instead the donor and the acceptor exhibit a strong electronic @[email protected], the reaction is described as @[email protected] The two terms derive from studies concerning metal complexes and it has been suggested that for organic reactions the terms 'nonbonded' and 'bonded' @[email protected] should be used.
See also:
inner-sphere electron transfer