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Acid-Induced Multicolor Fluorescence of Pyridazine Derivative

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journal contribution
posted on 12.12.2017, 00:00 by Mengwei Li, Yuan Yuan, Yulan Chen
Smart luminescent materials that are responsive to external stimuli have received considerable attention. Here, we report a new D–A type 1,2-pyridiazine derivative (3,4,5,6-tetrakis­(4-methoxyphenyl)­pyridazine (TPP)) exhibiting turn-on fluorescence upon acid exposure both in solution and in the solid state. The protonation of the 1,2-pyridiazine ring caused a variation in the emission colors of the acidification species from blue (406 nm) to orange-red (630 nm) with a huge Δλem (224 nm). As a result, a synthetic rainbow of emission in solution could be achieved from one single molecule, and white photoluminescence was readily tuned by controlled protonation. A trifluoroacetic acid (TFA)-sensor film made from TPP was demonstrated as a TFA-sensitive surface with high sensitivity and reversibility. On the basis of these findings, we constructed a solid-state TPP film with a photoacid generator and demonstrated data encryption and decryption via a cascade protonation reaction that was well controlled by UV light.