Title: isotopically unmodified
Long Title: IUPAC Gold Book - isotopically unmodified
DOI: 10.1351/goldbook.I03339
Status: current

Definition
Describes a compound that has a macroscopic composition such that its constituent nuclides are present in the proportions occurring in nature.

Related Terms
- constituent: https://goldbook.iupac.org/terms/view/C01281
- nuclides: https://goldbook.iupac.org/terms/view/N04257

Sources
- Blue Book, p. 514 (https://www.acdlabs.com/iupac/nomenclature/)
- PAC, 1981, 53, 1887. 'Nomenclature of inorganic chemistry: II.1 - Isotopically modified compounds' on page 1889 (https://doi.org/10.1351/pac198153101887)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/I03339/html
- json: https://goldbook.iupac.org/terms/view/I03339/json
- xml: https://goldbook.iupac.org/terms/view/I03339/xml

Citation: Citation: 'isotopically unmodified' 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.I03339
License: The IUPAC Gold Book is licensed under Creative Commons Attribution-ShareAlike CC BY-SA 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/) for individual terms.
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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: 2026-05-15T02:39:05+00:00