Title: fac-
Long Title: IUPAC Gold Book - <i>fac</i>-
DOI: 10.1351/goldbook.F02313
Status: current

Definition
An affix used in names to designate three groups occupying the corners of the same face of an octahedral coordination sphere, not now generally recommended for precise nomenclature purposes.

Related Term
- coordination: https://goldbook.iupac.org/terms/view/C01329

Sources
- Blue Book, p. 464 (https://www.acdlabs.com/iupac/nomenclature/)
- Red Book, 3rd ed., p. 245

Other Outputs
- html: https://goldbook.iupac.org/terms/view/F02313/html
- json: https://goldbook.iupac.org/terms/view/F02313/json
- xml: https://goldbook.iupac.org/terms/view/F02313/xml

Citation: Citation: '<i>fac</i>-' 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.F02313
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Disclaimer: 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.
Accessed: 2026-05-15T02:30:28+00:00