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In this study, we discovered that commercially available benzene\u20101,4\u2010diboronic acid (<jats:bold>BDBA<\/jats:bold>) doped co\u2010crystals with trimethylolpropane (<jats:bold>TMP<\/jats:bold>) exhibit excellent thermochromic dual phosphorescence properties over a wide temperature range from \u2212132 to 40\u2009\u00b0C, despite its simple structure that does not have any donor\u2010acceptor linkage. The dual phosphorescence was consisted of monomeric benzene\u20101,4\u2010diboronate (<jats:bold>BDBA<\/jats:bold> ester) and aggregation\u2010stabilized species. With an increase in temperature, the emission intensity from the monomeric state significantly decreased, whereas that originating from the aggregated state remained almost constant owing to the difference in their thermal stabilities. Further investigation revealed that molecular distortions in singlet excited states enable efficient intersystem crossing, causing efficient phosphorescence from the monomeric state of <jats:bold>BDBA<\/jats:bold> ester.<\/jats:p>","DOI":"10.1002\/chem.202303924","type":"journal-article","created":{"date-parts":[[2024,1,5]],"date-time":"2024-01-05T04:44:45Z","timestamp":1704429885000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Thermochromic Afterglow from Benzene\u20101,4\u2010Diboronic Acid\u2010Doped Co\u2010crystals"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-3353-0393","authenticated-orcid":false,"given":"Kaede","family":"Kawaguchi","sequence":"first","affiliation":[{"name":"Department of Applied Chemistry Graduate School of Urban Environmental Sciences Tokyo Metropolitan University  1-1 Minami-Osawa, Hachioji-shi Tokyo 192-0397 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