A novel multifunctional photochromic molecule, BTF–BTH , was synthesized via covalently linking two photoswitchable fluorescent diarylethenes BTFO4 and BTHTO , and the structure was characterized using NMR and MS analysis. The photophysical properties of four photoisomeric states, BTFo–BTHo , BTFc–BTHc , BTFc–BTHo and BTFo–BTHc , were studied. Interconversions among these states were readily achieved using light irradiation and the addition of Cu ~(2+) . Interestingly, a fluorescence energy transfer phenomenon was observed for BTFc–BTHc . Based on these results, logic gates, including OR, keypad lock, INHIBIT, AND, and 1:2 demultiplexer, were designed and successfully demonstrated using BTF–BTH .
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