Abstract
Highly sensitive and selective fluorescence sensing of antibiotics and heavy metal ions are extremely vital to safeguard human health. Two new water-stable ternary coordination polymers (CPs), {[Cd(NPTA)(L)]·1.75H2O}n (1) and [Co1.5(BTC)(L)]n (2) (H2NPTA = 3-nitrophthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid, and L = 1,5-bis(benzimidazole-2-yl)pentane) were prepared through the hydrothermal process. 1 features a 1D zigzag infinite chain which is linked into a 2D network via π–π stacking interactions, while 2 shows a 2D 3,4L35 layer and can be further extended into a 3D supramolecular framework by hydrogen-bonding interactions. The two CPs display superior thermal and chemical stability in a wide pH range from 3 to 12. Furthermore, both 1 and 2 can be as the dual-responsive probes for selective sensing of enrofloxacin (ENR) and Al3+ ions with reusability.
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