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Novel colorless (MePPh 3 ) 2 Cu 2 I 4 ·DMF with cyan emission undergoes structural transformation into yellow-emitting (MePPh 3 ) 2 Cu 4 I 6 upon ethanol stimulation, exhibiting a peculiar dual-optical mode response and advanced anti-counterfeiting capabilities.
Guo et al. (Wed,) studied this question.