Liu, YuxinYuxinLiuSeeberger, Peter H.Peter H.SeebergerMerbouh, NabylNabylMerbouhLoeffler, Felix F.Felix F.Loeffler2025-12-012025-12-012021-11-22Chemistry A European Journal 27 (65): 16098-16102 (2021)https://hdl.handle.net/11420/59296Fluorescence signals have been widely used in information encryption for a few decades, but still suffer from limited reliability. Here, reversible multichannel fluorescent devices with encrypted information were constructed, based on two fluorescent positional isomers of a diphenylquinoxaline derivative. Possessing the same core fluorescent group and acid-/pH-responsive mechanism, the two isomers showed different fluorescence colors in an acidic environment; this allowed us to realize stepwise encryption of information in orthogonal fluorescence channels. Because the protonation was reversible, the revealed information could be re-encrypted simply by heating. This approach highlights the value of positional isomers to build multichannel encryption devices, improving their reliability on the molecular level.de1521-37652021651609816102acid responseencryptionfluorescencemultichannelpositional isomersJournal Article10.1002/chem.202103441Journal Article