Term: phosphine oxides https://doi.org/10.1351/goldbook.P04552 Definition: Compounds having the structure R3P=O↔︎ R3P+–O− (analogously, phosphine imides and phosphine sulfides). Related Terms: 1) imides (http://doi.org/10.1351/goldbook.I02948). 2) sulfides (http://doi.org/10.1351/goldbook.S06102). Source: PAC, 1995, 67, 1533. 'Use of immunoassays for the analysis of pesticides and some other organics in water samples (Technical Report)' on page 1537 (https://doi.org/10.1351/pac199567081533) Citation: 'phosphine oxides' 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.P04552 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.