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Herein, a colorimetric\/fluorescent dual\u2010mode sensor based on rhodamine B\u2013aluminum complex (RhB\u2013Al<jats:sup>3+<\/jats:sup>) has been developed for the detection of trace water in methanol, ethanol, isopropanol, and 1\u2010butanol. The RhB\u2013Al<jats:sup>3+<\/jats:sup> complex demonstrates rapid response (&lt;\u200910\u2009s), high sensitivity (detection limits [<jats:italic>v<\/jats:italic>\/<jats:italic>v<\/jats:italic>]): 0.0134% (ethanol), 0.0074% (methanol), 0.0224% (isopropanol), and 0.0498% (1\u2010butanol), and excellent specificity. In addition, the color of the RhB\u2013Al<jats:sup>3+<\/jats:sup> complex in alcohols solution changed from pink to colorless under visible light and from yellow to colorless under a 365\u2010nm UV light, which enabled naked\u2010eye detection of trace water in alcohol solvents. The sensing mechanism was investigated by <jats:sup>1<\/jats:sup>H\u2010NMR, HR\u2010MS, pH, and spectroscopy analysis. It was demonstrated to involve water molecules coordination to the Al<jats:sup>3+<\/jats:sup> of the RhB\u2013Al<jats:sup>3+<\/jats:sup> complex, which leads to the dissociating of the complex and in turn promotes the reformation of the rhodamine spirolactam ring. Moreover, the RhB\u2013Al<jats:sup>3+<\/jats:sup> complex was successfully used for sensing trace water in commercial alcohol solvents, demonstrating its potential for industrial quality control applications.<\/jats:p>","DOI":"10.1002\/bio.70259","type":"journal-article","created":{"date-parts":[[2025,7,21]],"date-time":"2025-07-21T03:13:13Z","timestamp":1753067593000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["A Dual Turn\u2010Off Colorimetric and Fluorescent Sensor for Trace Water in Alcohols Based on a Rhodamine B\u2013Al<sup>3+<\/sup> Complex"],"prefix":"10.1002","volume":"40","author":[{"given":"Xiaofang","family":"Ding","sequence":"first","affiliation":[{"name":"Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Laboratory for Novel Reactor and Green Chemistry Technology, School of Chemical Engineering and Pharmacy Wuhan Institute of Technology  Wuhan 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