Two Bisligand-Coordinated Luminescent Zn(II)-Coordination Polymers for Sensing of Ions and Pesticides in Aqueous Solutions

Two coordination polymers (CPs) [Zn(PTA)(DTP)(H 2 O) 2 ]•(DMF) ( CP-1 ) and [Zn(BTC)(DTP)]•(CH 3 CN) 1.5 •(H 2 O) 4 ( CP-2 ) with one- and two-dimensional architectures were synthesized from Zn(II) ion and different organic linkers like terephthalic acid (H 2 PTA), benzene-1,3,5-tricarboxylic acid (H 3 BTC), and 3,5-di(1,2,4-triazol-1-yl) pyridine (DTP). The fluorescent sensing experiments showed that the two CPs displayed effective, sensitive, and selective abilities towards Fe 3+ and Cr 2 O 7 2- . For sensing the pesticides, CP-1 outperforms in sensing of metamitron (MMT) and CP-2 is ultrasensitive towards imidacloprid (IMI). The possible mechanisms involved in the quenching of the fluorescence intensity include the inner filter effect (IFE) and the fluorescence resonance energy transfer (FRET) effect.