Tetraphenylethylene-based fluorescent conjugated microporous polymers for fluorescent sensing trinitrophenol

Two tetraphenylethylene-based fluorescent conjugated microporous polymers (TTTPT and TTDAT) were obtained by the Friedel−Crafts polymerization reactions catalysed by CH 3 SO 3 H. In virtue of containing tetraphenylethylene, triphenylamine and s-triazine units in their porous skeletons, the resulting TTTPT and TTDAT show excellent fluorescence sensing performance for trinitrophenol (TNP) with high quenching coefficients of 1.66 × 10 4 and 1.31 × 10 5 l mol –1 , respectively. TTDAT can also sense to dinitrophenol (DNP) with the K sv of 2.70 × 10 4 l mol –1 . The fluorescent quenching mechanisms of TTTPT and TTDAT for selective detecting TNP attribute to conventional photoinduced electron-transfer mechanism, absorption competition quenching mechanism and/or the resonant energy transfer mechanism.