A 3D nickel(II) coordination polymer constructed by mixed- ligand strategy: synthesis, crystal structure and sensing of Hg(II) ion

Abstract

A new N-containing coordination polymer, namely, [Ni(L)(dpa)·2.5H₂O]_n (1) (H₂L = 4,4'-azanediyldibenzoic acid, dpa = 4,4’-dipyridylamine) has been constructed under hydrothermal conditions. Structural analysis reveals that complex 1 exhibits a 3D 4-connected binodal net. With functional amino group, complex 1 is developed to detect heavy metal ions by colorimetric method. Notably, 1 can selectively detect Hg²⁺ and it is free from the interference of other metal ions. The linear range for Hg²⁺ detection is 0.1 to 0.5 mL. XPS shows that the N atoms of amino groups in 1 are responsible for the Hg²⁺ detection.

Graphical abstract

Keywords:

• N-containing coordination polymer
• Hg²⁺ detection
• detecting mechanism

Additional information

Funding

This work is financially supported by the National Natural Science Foundation of China (Nos. 51604307) and Natural Science Foundation of Hunan Province of China (No. 2019JJ50830).