Triphenylamine- and triazine-based conjugated microporous polymers constructing from triphenylamine and its derivatives with nitrogen as core for fluorescence sensing o-nitrophenol

Three triphenylamine- and s-triazine-based conjugated microporous polymers (TTPA, TTDATA, and TTMDATA) were prepared via the Friedel-Crafts arylation reactions under the catalytic action of CH3SO3H. In virtue of containing rich nitrogen atoms in their porous frameworks, the obtained TTPA, TTDATA, and TTMDATA possess good fluorescence sensing property for o-nitrophenol (o-NP) with high quenching coefficients of 1.54 x 10(4), 1.32 x 10(4), 1.33 x 10(3) L mol(-1) and low limits of detection (LODs) of 2.44 x 10(-9), 1.14 x 10(-11), and 1.35 x 10(-8) mol L-1, respectively. The fluorescent quenching mechanism of TTPA for selective sensing o-NP is the photo-induced charge-transfer mechanism. However, the fluorescent quenching mechanisms of TTDATA and TTMDATA for selective sensing o-NP have both the photo-induced charge-transfer mechanism and the resonant energy transfer mechanism.