Abstract
Two new coordination polymers (CPs), [Cd(L)(NTA)]n (1) and [Ni(L)(NPTA)·H2O]n (2) (L = 1,6-bis(benzimidazol-1-yl)hexane, H2NTA = 2-nitroterephthalic acid and H2NPTA = 3-nitrophthalic acid) were prepared under solvothermal conditions. Both CPs exhibit 2D layered structures with sql and hcb network, respectively. 1 and 2 are further extend into 3D supramolecular networks by π–π stacking interactions. The luminescent experiments show that 1 and 2 can serve as efficient probes for sensing acetylacetone (acac) with high quenching efficiency (Ksv = 1258 M–1 for 1, 4841 M–1 for 2) and low detection limit (3.63 μM for 1 and 0.79 μM for 2). 1 and 2 also possess selective and sensitive sensing for Hg2+ with quenching efficiency 3565 M–1 for 1 and 7432 M–1 for 2 and low detection limit 3.05 μM for 1, 2.29 μM for 2, respectively. When acac and Hg2+ ions are at a low concentration, there are good linear relationships between concentrations and quenching efficiencies. 1 and 2 represent the first example based on CPs as luminescent chemosensors for acac and Hg2+ ions detection.
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