Term: chiroptic/chiroptical https://doi.org/10.1351/goldbook.C01064 Definition: A term referring to the optical techniques (using refraction, absorption or emission of anisotropic radiation) for investigating chiral substances [e.g. measurements of optical rotation at a fixed wavelength, optical rotatory dispersion (ORD), circular dichroism (CD), and circular polarization of luminescence (CPL)]. Related Terms: 1) chiral (http://doi.org/10.1351/goldbook.C01057). 2) optical rotation (http://doi.org/10.1351/goldbook.O04312). 3) wavelength (http://doi.org/10.1351/goldbook.W06659). 4) dichroism (http://doi.org/10.1351/goldbook.DT07357). 5) polarization (http://doi.org/10.1351/goldbook.P04712). 6) luminescence (http://doi.org/10.1351/goldbook.L03641). Source: PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2203 (https://doi.org/10.1351/pac199668122193) Citation: 'chiroptic/chiroptical' 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.C01064 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.