A high selective Zn-based luminescent metal-organic framework for fluorescence sensing detecting iron(III) and trinitrophenol

A zinc-based fluorescent organic framework was synthesized successfully based on a polyfunctional groups ligand [1-{2-(2-pyridyl)-benzo [d] imidazole}-2-(5-hydroxyisophthalic acid) ethane] (H2L). The synthesized complex 1 displayed excellent acid/base and thermal stability. Remarkably, complex 1 showed a high sensitivity for detecting 2, 4, 6-trinitrophenol (TNP) with the Ksv of 0.7486 × 105 M−1. Besides, it has excellent detect selectivity and sensitivity to Fe3+ ion even in the presence of other interfering metal cations, the Ksv is 0.3887 × 105 M−1. Furthermore, it has good recyclability and can be regenerated multiple times for detecting TNP or Fe3+. Finally, the luminescence quenching mechanisms in the process of extinction are also explored.