Title: catalyst precursor
Long Title: IUPAC Gold Book - catalyst precursor
DOI: 10.1351/goldbook.08938
Status: current

Definition
Coordination compound that by reaction with an activator or cocatalyst provides an active catalyst during initialization of coordination polymerization.

Example
Catalyst precursors are certain transition metal or rare-earth metal complexes, such as titanium tetrachloride or bis(cyclopentadienyl)titanium chloride.

Related Terms
- coordination polymerization: https://goldbook.iupac.org//terms/view/08995
- initialization: https://goldbook.iupac.org//terms/view/08956

Source
- PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1116 (https://doi.org/10.1515/pac-2020-1211)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/08938/html
- json: https://goldbook.iupac.org/terms/view/08938/json
- xml: https://goldbook.iupac.org/terms/view/08938/xml

Citation: Citation: 'catalyst precursor' 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.08938
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Accessed: 2026-06-21T23:41:31+00:00