Term: xanthene dyes https://doi.org/10.1351/goldbook.X06695 Definition: Dyes derived by condensation of phthalic anhydride with resorcinol (and derivatives) or m-aminophenol (and derivatives), of which fluorescein is the prototype (all such dyes have the xanthene nucleus). X06695.png Related Terms: 1) phthaleins (http://doi.org/10.1351/goldbook.P04662). 2) rhodamine dyes (http://doi.org/10.1351/goldbook.R05384). 3) nucleus (http://doi.org/10.1351/goldbook.N04256). Image: Not defined (https://goldbook.iupac.org/img/inline/X06695.png) Source: PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1374 (https://doi.org/10.1351/pac199567081307) Citation: 'xanthene dyes' 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.X06695 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.