The synthesis of s-tetrazine-based porous organic polymer for fluorescence sensing of iodine, picric acid and capturing iodine

The s-tetrazine-based porous organic polymer (TPBTz) has been synthesized through the polymerization reaction of 1,3,5-tri(4-cyanophenyl)benzene and hydrazine hydrate catalyzed by sulfur powder. Results indicate that TPBTz can be used not only as a fluorescent sensor for high selective and sensitive sensing of iodine and picric acid in real-time, but also as an excellent adsorbent for capturing iodine. TPBTz exhibits extremely high sensitivity for iodine with K SV of 1.70 × 10 5 L mol −1 and the limit of detection of 1.76 × 10 –11 mol L −1 . The possible sensing mechanism for TPBTz fluorescence quenching by I 2 upon 293 nm excitation is the electron transfer mechanism. Furthermore, TPBTz can also adsorb iodine in vapor phase and release iodine by heating. In brief, the bifunctional properties of TPBTz for sensing and uptaking iodine provide a useful strategy to find the iodine pollution and further capture it in practical applications.