{"term":{"id":"00618","title":"bathochromic shift","longtitle":"IUPAC Gold Book - bathochromic shift","doi":"10.1351\/goldbook.B00618","code":"B00618","status":"current","synonym":"<em>synonym<\/em>: bathochromic effect","definitions":[{"id":1,"text":"Shift of a spectral band to lower frequencies (longer wavelengths) owing to the influence of substitution or a change in environment. It is informally referred to as a red shift and is opposite to hypsochromic shift (blue shift).","links":[{"term":"blue shift","url":"https:\/\/goldbook.iupac.org\/terms\/view\/B00688"},{"term":"hypsochromic shift","url":"https:\/\/goldbook.iupac.org\/terms\/view\/H02929"},{"term":"red shift","url":"https:\/\/goldbook.iupac.org\/terms\/view\/R05211"}],"sources":["PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1088 (https:\/\/doi.org\/10.1351\/pac199466051077)","PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2230 (https:\/\/doi.org\/10.1351\/pac199668122223)"]}],"altoutputs":{"html":"https:\/\/goldbook.iupac.org\/terms\/view\/B00618\/html","xml":"https:\/\/goldbook.iupac.org\/terms\/view\/B00618\/xml","plain":"https:\/\/goldbook.iupac.org\/terms\/view\/B00618\/plain"},"citation":"Citation: 'bathochromic shift' 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.B00618","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.","collection":"If you are interested in licensing the Gold Book for commercial use, please contact the IUPAC Executive Director at executivedirector@iupac.org .","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.","accessed":"2026-06-29T23:51:04+00:00"}}