Fluorescent nose: The reversible “turn-on” vapochromism of a self-assembled amphiphilic naphthalene diimide derivative in solution and film states is presented. This property was found to be due to solvent–vapor-responsive, dynamic reorganization in molecular packing in going from J-type aggregates (blue fluorescent; see left-hand side of scheme) to preassociated H-type excimer states, with enhanced green fluorescence.
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Kumar et al. (2011) studied this question.
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