Two Zn(II)-based coordination polymers as difunctional luminescence sensors to detect nitrofurazone and Fe³⁺ ions

The effective detection of antibiotics and metal cations in the environment were attracted widespread attention. Two unique ternary Zn(II) complexes [ZnL(1,4-NDA)] (n) (1) and {[ZnL(2,6-NDA)]center dot 2.75H(2)O}(n) (2) (L = 1,3-bis[1((pyridine-4-methylene)-1H-benzimidazol-2-yl]propane, 1,4-H(2)NDA = 1,4-naphthalene dicarboxylic acid, 2,6H(2)NDA = 2,6-naphthalene dicarboxylic acid) were hydrothermally synthesized and characterized. 1 exhibits a 1D serrated chain, which is further extended into a 3D supramolecular framework via pi-pi stacking interactions. 2 displays a 3D 4-connected sqc182 framework. Complexes 1 and 2 exhibit excellent anti-interference ability and high stability and can be used as promising sensors for the detecting nitrofurazone and Fe3+ ions by luminescence quenching. The relevant fluorescent sensing was discussed in detail.