Term: adsorption complex https://doi.org/10.1351/goldbook.A00158 Definition: The entity constituted by the adsorbate and the part of the adsorbent to which it is bound. Related Terms: 1) adsorbate (http://doi.org/10.1351/goldbook.A00152). 2) adsorbent (http://doi.org/10.1351/goldbook.A00153). Source: PAC, 1976, 46, 71. 'Manual of Symbols and Terminology for Physicochemical Quantities and Units - Appendix II. Definitions, Terminology and Symbols in Colloid and Surface Chemistry. Part II: Heterogeneous Catalysis' on page 74 (https://doi.org/10.1351/pac197646010071) Citation: 'adsorption complex' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.A00158 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. 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.