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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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Mutai et al. (2008) studied this question.
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