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a Synthetic route to P1a/2a/3a and its protonation and deprotonation. b Absorption and emission spectra of a thin film of P1a/2a/3a (red) after fuming with HCl vapor (black, 10 s) followed by NH3 vapor (blue, 0.08 M, 30 s). Inset: fluorescent microscopy photographs. c Spoilage detection of scallops in sealed packages for 12 h at room temperature using H2P1a/2a/3a2+ thin film.
Reproduced from [108] with permission from Wiley-VCH
