03052 IUPAC Gold Book - inner-sphere electron transfer 10.1351/goldbook.I03052 I03052 current 1 Historically an electron transfer between two metal centres sharing a ligand or atom in their respective coordination shells. The definition has more recently been extended to any situation in which the interaction between the donor and acceptor centres in the transition state is significant (\(\pu{\gt 20 kJ mol-1}\)). coordination https://goldbook.iupac.org//terms/view/C01329 electron transfer https://goldbook.iupac.org//terms/view/E02011 outer-sphere electron transfer https://goldbook.iupac.org//terms/view/O04351 transition state https://goldbook.iupac.org//terms/view/T06468 PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1125 (https://doi.org/10.1351/pac199466051077) PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2247 (https://doi.org/10.1351/pac199668122223) https://goldbook.iupac.org/terms/view/I03052/html https://goldbook.iupac.org/terms/view/I03052/json https://goldbook.iupac.org/terms/view/I03052/plain Citation: 'inner-sphere electron transfer' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.I03052 The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using. 2026-05-18T02:28:51+00:00