Title: spacer arm
Long Title: IUPAC Gold Book - spacer arm
DOI: 10.1351/goldbook.09031
Status: current

Definition
Link used in a conjugation to distance the substrate from the active species that otherwise would have its activity affected by steric or other influences.

Related Term
- Link: https://goldbook.iupac.org//terms/view/09029

Source
- PAC, 2022, 94, 559. 'Terminology and the naming of conjugates based on polymers or other substrates (IUPAC Recommendations 2021)' on page 563 (https://doi.org/10.1515/pac-2020-0502)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/09031/html
- json: https://goldbook.iupac.org/terms/view/09031/json
- xml: https://goldbook.iupac.org/terms/view/09031/xml

Citation: Citation: 'spacer arm' 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.09031
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: 2026-04-18T05:26:37+00:00