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

Two coordination polymers (CPs) [Zn(PTA)(DTP)(H2O)2]center dot(DMF) (CP-1) and [Zn(BTC)(DTP)]center dot(CH3CN)1.5 center dot(H2O)4(CP-2) with one-and two-dimensional architec-tures were synthesized from Zn(II) ion and different organic linkers like terephthalic acid (H2PTA), benzene-1,3,5-tricarboxylic acid (H3BTC), and 3,5-di(1,2,4-triazol-1-yl) pyri-dine (DTP). The fluorescent sensing experiments showed that the two CPs displayed effective, sensitive, and selective abilities towards Fe3+ and Cr2O72-. For sensing the pesticides, CP-1 outperforms in sensing of metamitron (MMT) and CP-2 is ultrasensi-tive towards imidacloprid (IMI). The possible mechanisms involved in the quenching of the fluorescence intensity include the inner filter effect (IFE) and the fluorescence re-sonance energy transfer (FRET) effect.