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In alcoholic media such as ethanol and 2\u2010propanol, the fluorenone\u2010based D\u2013A\u2013D triad with triethylene glycol linkers (<jats:bold>F\u2010EG<jats:sub>3<\/jats:sub>\u2010BU<\/jats:bold>) specifically form supramolecular gels via hydrogen bonds between the urethane units. The extension of the OEG linkers (<jats:bold>F\u2010EG<jats:sub>4<\/jats:sub>\u2010BU<\/jats:bold>) reduced the strength of molecular aggregates, resulting in higher solubility in various organic solvents. Each compound formed intramolecular charge transfer (ICT) states, as evidenced by the ICT band in the UV\u2013vis absorption spectra and the twisted intramolecular charge transfer emission bands in the photoluminescence spectra. Changes in the absorption and emission spectra of short\u2010chain poly(ethylene glycol)s (SC\u2010PEGs) gelated with <jats:bold>F\u2010EG<jats:sub>2<\/jats:sub>\u2010BU<\/jats:bold> depend on the coexisting ionic species. In this study, we describe the unique chemical stimuli\u2013response behaviors of fluorenone\u2010based SC\u2010PEG gels that cause significant changes in the spectroscopic properties upon ion doping with NaCl and alkali metal hydroxides.<\/jats:p>","DOI":"10.1002\/asia.202500129","type":"journal-article","created":{"date-parts":[[2025,4,14]],"date-time":"2025-04-14T21:35:56Z","timestamp":1744666556000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Color Changes in Gels Composed of Hydrogen\u2010Bonding Donor\u2013Acceptor\u2013Donor\u2010Type Fluorenone Derivatives and Short\u2010Chain Polyethylene Glycol in Response to Ionic Species"],"prefix":"10.1002","volume":"20","author":[{"given":"Syota","family":"Yamada","sequence":"first","affiliation":[{"name":"Department of Chemistry Graduate School of Science Tokyo University of Science  1\u20103 Kagurazaka, Shinjuku\u2010ku Tokyo 162\u20108601 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