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The weakly luminous structure of <jats:bold>BCOD\u2010DK<\/jats:bold> can be changed quantitatively to that of the strongly fluorescent BODIPY <jats:bold>BCOD\u2010Ant<\/jats:bold> by optical excitation at the DK unit, which induces double decarbonylation of the DK unit to give an anthracene unit. The solvent effect on the fluorescence properties of <jats:bold>BCOD\u2010DK<\/jats:bold> suggests that the dramatic change in fluorescence intensity is controlled by intramolecular electron transfer from the BODIPY moiety to the <jats:italic>meso<\/jats:italic>\u2010DK substituent. <jats:bold>BCOD\u2010DK<\/jats:bold> is converted to <jats:italic>meso<\/jats:italic>\u2010<jats:bold>DK<\/jats:bold> benzene\u2010fused BODIPY (<jats:bold>Benzo\u2010DK<\/jats:bold>) by heating at 220\u2009\u00b0C with 64\u201370\u2005nm redshift of absorption and fluorescence peaks without changing the fluorescence quantum yield of <jats:italic>\u03a6<\/jats:italic><jats:sub>F<\/jats:sub>=0.08 in dichloromethane. <jats:bold>Benzo\u2010DK<\/jats:bold> can be converted to strongly fluorescent <jats:italic>meso<\/jats:italic><jats:bold>\u2010<\/jats:bold>anthracene benzene\u2010fused BODIPY <jats:bold>Benzo\u2010Ant<\/jats:bold> by optical excitation. Thus, <jats:bold>BCOD\u2010DK<\/jats:bold> can show four different optical performances simply by irradiation and heating, and hence may be applicable for optical data storage and security data encryption.<\/jats:p>","DOI":"10.1002\/chem.201406384","type":"journal-article","created":{"date-parts":[[2015,2,24]],"date-time":"2015-02-24T08:00:06Z","timestamp":1424764806000},"page":"4966-4974","source":"Crossref","is-referenced-by-count":29,"title":["An Optically and Thermally Switchable Electronic Structure Based on an Anthracene\u2013BODIPY 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