Inverted region

{
  "id": "MLC-T-CHM-006065",
  "term": "Inverted region",
  "field": "Chemistry",
  "definition": "A regime in electron transfer reactions where increasing the exergonicity (driving force) of the reaction leads to a decrease in the reaction rate, rather than an increase. This behavior is predicted by the Marcus theory of electron transfer and occurs when the reorganization energy is less than the free energy change. In this region, the activation barrier for electron transfer begins to rise again.",
  "synonyms": [
    "Marcus inverted region"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Marcus equation",
    "electron transfer",
    "excited state",
    "normal region",
    "outer-sphere electron transfer",
    "reorganization energy"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2249 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/inverted-region/"
}