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Coordination polymer (CP) materials have an important application as sensors. In this work, two new Ni(II)/Zn(II)-CPs of sebacic acid (H2seb) and 1,6-bis(benzimidazole)hexane (bbimh), {[Ni3(seb)3(bbimh)4]·7H2O}n (1) and {[Zn(seb)(bbimh)]·H2O}n (2), were constructed as luminescent sensors. Ni(II)-CP 1 features a three-dimensional (3D) (4,5)-connected framework including 1D channels occupied by water molecules. Zn(II)-CP 2 shows a 3D supramolecular network with 6-connected pcu topology. Both CPs have good stability in aqueous solution as well as in EtOH. Luminescence sensing studies reveal that 1 and 2 display high luminescence quenching efficiency toward IO4, 2,6-dichloro-4-nitrophenol (2,6-DCNP) and folic acid (FA). Both CPs also display excellent sensitivity with limits of detection toward IO4, 2,6-DCNP and FA as low as 1.23 μM, 13.26 nM and 13.04 μM for 1 and 1.26 μM, 30.61 nM and 15.70 μM for 2, respectively. Additionally, the two CPs were also demonstrated to be ultrasensitive and selective sensors for the detection of IO4 in swimming pool water, 2,6-DCNP in farmland sewage and FA in human serum. The experimental results suggest that the synthesized Ni(II)/Zn(II)-CPs have potential application as luminescence sensing materials in environmental pollution and human health.

Graphical abstract: Highly stable Ni(ii)/Zn(ii)-CPs as multiresponsive luminescent sensors for detection of IO4−, 2,6-dichloro-4-nitrophenol and folic acid

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