Fac-

{
  "id": "MLC-T-CHM-004322",
  "term": "Fac-",
  "field": "Chemistry",
  "definition": "A stereodescriptor used in coordination chemistry to denote a facial arrangement of three identical ligands around a central metal atom in an octahedral complex. The three ligands occupy positions on one face of the octahedron. This is contrasted with the 'mer-' descriptor, where the three ligands are arranged meridionally.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "coordination"
  ],
  "references": [
    "Blue Book, p. 464 (https://www.acdlabs.com/iupac/nomenclature/)",
    "Red Book, 3rd ed., p. 245"
  ],
  "url": "https://mlchart.com/terminology/chemistry/fac/"
}