13975 IUPAC Gold Book - rotaxane constitutional repeating unit 10.1351/goldbook.13975 13975 current abbrev: rot-CRU synonym: rotaxane CRU 1 Constitutional repeating unit (CRU) that has a rotaxane structure. Constitutional repeating unit is the smallest constitutional unit the repetition of which constitutes a regular macromolecule, a regular oligomer molecule, a regular block, or a regular chain. PAC, 2012, 84, 2135. 'Terminology and nomenclature for macromolecular rotaxanes and pseudorotaxanes (IUPAC Recommendations 2012)' on page 2142 (https://doi.org/10.1351/PAC-REC-11-10-15) https://goldbook.iupac.org/terms/view/13975/html https://goldbook.iupac.org/terms/view/13975/json https://goldbook.iupac.org/terms/view/13975/plain Citation: 'rotaxane constitutional repeating unit' 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.13975 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. If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org . 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. 2026-05-09T16:59:25+00:00