Acceptor number

{
  "id": "MLC-T-CHM-000099",
  "term": "Acceptor number",
  "field": "Chemistry",
  "definition": "A quantitative measure of the Lewis acidity of a solvent, reflecting its ability to accept electron density from a donor molecule. It is derived from the chemical shift of the 31P nucleus of triethylphosphine oxide in the solvent, relative to its shift in hexane. Higher acceptor numbers indicate stronger Lewis acidity.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "Lewis acidity"
  ],
  "references": [
    "PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1081 (https://doi.org/10.1351/pac199466051077)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/acceptor-number/"
}