The preparation of hexaphenylsilole-based conjugated microporous polymer for fluorescence sensing o-nitrophenol

A first hexaphenylsilole-based conjugated microporous polymer, termed THPS, was prepared by a Friedel-Crafts arylation reaction of 1,1,2,3,4,5-hexabenylthirole with 2,4,6-trichloro-1,3,5-triazine catalyzed by anhydrous aluminium trichloride (AlCl 3 ) in 1,2-dichloroethane. Its Brunauer–Emmett–Teller and Langmuir surface area reached up to 1579 and 2081 m 2 g −1 , and total pore volume and micropore pore volume were severally 0.8325 and 0.7322 cm 3 g −1 . THPS could fluorescence-sense o- nitrophenol with high sensitivity and selectivity. Its fluorescence quenching constant (K SV ) and limits of detection (LODs) were severally 8.32 × 10 3 L mol −1 and 3.61 × 10 -10 mol L −1 . The fluorescence quenching of THPS by o- nitrophenol was originated from the combined action of both photo-induced electron transfer mechanism and resonance energy transfer mechanism.