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The dyes exhibit solvent\u2010independent split electronic absorption due to exciton\u2010coupling. Interestingly significant solvent\u2010dependent fluorescence properties were observed. In toluene, they emit from the lowest excited state, while in methanol, they show weak emission in the higher energy region. In the low\u2010temperature glass matrix, emission from the lowest excited state dominates similarly to that in toluene. The transient absorption spectra exhibit similar ground\u2010state bleaching in toluene and methanol, revealing the formation of delocalized excited states by exciton coupling independent of solvent. However, the excited state deactivates rapidly in ultrafast time scale in methanol, likely due to solvent interaction, leading to rapid non\u2010radiative deactivation. The PEG film doped with the exciton\u2010coupled bis\u2010squaraine shows a distinct fluorescence response to methanol vapor.<\/jats:p>","DOI":"10.1002\/asia.202300868","type":"journal-article","created":{"date-parts":[[2023,11,2]],"date-time":"2023-11-02T11:44:25Z","timestamp":1698925465000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Squaraine Appended with Benzodipyrrole for Fluorescent Sensing of Methanol: Exciton Coupling Controls Photophysical Properties"],"prefix":"10.1002","volume":"18","author":[{"given":"Ryuhei","family":"Sawada","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Engineering Osaka Metropolitan University Naka-ku, Sakai  Osaka 599-8531 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