A Unique Cd4-Cluster-Based Coordination Polymer with Efficient Luminescent Detection of 2,4,6-Trinitrophenol and MnO4-

2,4,6-Trinitrophenol (TNP) and MnO4- have potential threats to human and microorganisms. Therefore, it is essential to develop efficient methods to detect TNP and MnO4-. Herein, a unique [Cd-4(COO)(8)]-cluster-based coordination polymer, namely [Cd-2(3-L)(ISO)(2)](n) (1) (3-L = 3,3 '-((9H-fluoren-9-ylidene)-methylene)dipyridine; H2ISO = isophthalic acid), is constructed by two rigid angular functional organic ligands. Two Cd1 and two Cd2 are associated together via eight carboxylic groups from eight ISO2- to form a rare [Cd-4(COO)(8)] cluster unit. The [Cd-4(COO)(8)] cluster units link with each other by two 3-L and four ISO2- bridges to generate a one-dimensional (1D) chain architecture, which contains a cavity structure and a rhombus channel. 1 has good water and thermal stabilities. Luminescence sensing experiments exhibit that 1 can highly sensitively and selectively detect TNP and MnO4- in H2O medium. The detection mechanisms of 1 towards TNP and MnO4- have been discussed. These experimental results suggest that 1 should be a promising sensor for TNP and MnO4-.

Automated summary

This article introduces a method for detecting TNP and MnO4- based on a [ Cd-4(COO)(8)] coordination polymer. The polymer exhibits good water and thermal stability, and can sensitively and selectively detect TNP and MnO4- in H2O medium.