Encounter-controlled rate

{
  "id": "MLC-T-CHM-003881",
  "term": "Encounter-controlled rate",
  "field": "Chemistry",
  "definition": "The rate of a chemical reaction that is limited by the frequency at which reactant molecules diffuse together to form an encounter complex. In such reactions, the activation energy for the chemical transformation within the complex is very low, making diffusion the slowest step. These rates are typically observed for very fast reactions in solution.",
  "synonyms": [
    "diffusion-controlled rate"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "molecularity",
    "diffusion",
    "encounter",
    "medium",
    "microscopic diffusion control",
    "molecular entity",
    "order of reaction",
    "rate of reaction"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1112 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/encounter-controlled-rate/"
}