## Wikipedia - Inner sphere electron transfer (en) Wikipedia - Intramolekularer Elektronentransfer (de) inner-sphere electron transfer

https://doi.org/10.1351/goldbook.I03052
Historically an @[email protected] between two metal centres sharing a ligand or atom in their respective @[email protected] shells. The definition has more recently been extended to any situation in which the interaction between the donor and acceptor centres in the @[email protected] is significant ($$> 20\ \text{kJ mol}^{-1}$$).