A novel family of organoboron compounds 1-4 with bright near-infrared (NIR) emissions in the crystalline state was synthesized. They show a morphology-dependent emission "ON" and "OFF" feature and volatile acid/base-induced fluorescence saltation which allow the realization of reversible solid-state fluorescence switching in the NIR region by totally different procedures: mechanical grinding/solvent annealing and acid/base vapor fuming.
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Cheng et al. (2014) studied this question.
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