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Switching of Polymorph-Dependent ESIPT Luminescence of an Imidazo[1,2-a]pyridine Derivative


  • This work was supported by a Grant-in-Aid (No. 18310076, 18710077, and 20510094) from the Ministry of Education, Culture, Sports, Science and Technology of Japan. ESIPT=excited-state intramolecular proton-transfer.


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Reproducible switching of the polymorph-dependent excited-state intramolecular proton-transfer (ESIPT) luminescence of an imidazo[1,2-a]pyridine between blue-green and yellow (see picture) is achieved by thermal control of its solid-state molecular packing. Thus, ESIPT is a promising mechanism for packing-to-luminescence transduction and amplification that offers a novel design concept for tunable organic luminescent solids.

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