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. 2016 May 3;7:11374. doi: 10.1038/ncomms11374

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Secret communication was achieved by using (a) a hand-held spectrometer, and (b) a second molecular cipher device (m-SMS₂) integrating coumarin (A), fluorescein (B) and a cyclen ligand (C). (c) Encryption patterns generated by m-SMS (blue lines) or m-SMS₂ (black lines) under the same conditions. The emission of each sensor (250 nM) was recorded in EtOH solution containing NaOAc (1 mM) and ZnCl₂ (1.3 mM; dashed line) and after adding AcOH (16 mM; solid line). m-SMS and m-SMS₂ were excited at 480 and 420 nm, respectively.