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simultaneously detecting both anions and cations via water content modulation is challenging. In this study, we synthesized and characterized a novel triazine calixarene derivative-based iodide and copper ion-selective fluorescent \u201cturn-off\u201d sensor. This dual-channeled fluorescent probe is able to recognize Cu2+ and I\u2212 ions simultaneously in aqueous systems. The fluorescent sensor s4 was synthesized by displacement reaction of acridine with 1, 3-bis (dichloro-mono-triazinoxy) benzene in acetonitrile. Mass spectrometry (MS), UV-vis, and fluorescence spectra were acquired to characterize the fluorescence response of s4 to different cations and anions, while infrared (IR) spectroscopy and isothermal titration calorimetry (ITC) were employed to study the underlying selectivity mechanism of s4 to Cu2+ and I\u2212. In detail, s4 displayed extremely high sensitivity to Cu2+ with over 80% fluorescence decrement caused by the paramagnetic nature of Cu2+ in the aqueous media. The reversible fluorescence response to Cu2+ and the responses to Cu2+ in the solution of other potential interferent cations, such as Li+, Na+, K+, Ca2+, Cd2+, Zn2+, Sr2+, Ni2+, Co2+ were also investigated. Probe s4 also exhibited very good fluorescence selectivity to iodide ions under various anion (F\u2212, Cl\u2212, Br\u2212, NO3\u2212, HSO4\u2212, ClO4\u2212, PF6\u2212, AcO\u2212, H2PO4\u2212) interferences. In addition to the fluorescent response to I\u2212, s4 showed a highly selective naked-eye-detectable color change from colorless to yellow with the other tested anions.<\/jats:p>","DOI":"10.3390\/molecules30132815","type":"journal-article","created":{"date-parts":[[2025,6,30]],"date-time":"2025-06-30T11:37:51Z","timestamp":1751283471000},"page":"2815","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Triazine Calixarene as a Dual-Channel Chemosensor for the Reversible Detection of Cu2+ and I\u2212 Ions via Water Content Modulation"],"prefix":"10.3390","volume":"30","author":[{"given":"Fuyong","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Long","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mei","family":"Yu","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liang","family":"Zhao","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lu","family":"Jiang","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2268-0820","authenticated-orcid":false,"given":"Tianzhu","family":"Shi","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ju","family":"Guo","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6828-2548","authenticated-orcid":false,"given":"Huayan","family":"Zheng","sequence":"additional","affiliation":[{"name":"Department of Brewing Engineering, Moutai Institute, Renhuai 564500, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruixiao","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Macrocycle and Supramolecular Chemistry of Guizhou Province, Guiyang 550025, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9481-4026","authenticated-orcid":false,"given":"Mingrui","family":"Liao","sequence":"additional","affiliation":[{"name":"Biological Physics Laboratory, Department of Physics and Astronomy, School of Natural Science, The University of Manchester, Oxford Road, Manchester M13 9PL, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"6280","DOI":"10.1021\/cr100154p","article-title":"Fluoro- and Chromogenic Chemodosimeters for Heavy Metal Ion Detection in Solution and Biospecimens","volume":"110","author":"Quang","year":"2010","journal-title":"Chem. 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