A chiral zinc(II) metal-organic framework as high selective luminescent sensor for detecting trace nitro explosives picric acid and Fe3+ ion

摘要

A chiral luminescent zinc(II)-MOF [Zn(BPDPE)(2)(dca)(2)](n), (1) (BPDPE=4,4'-bis(pyridy)diphenyl ether, H2dca=Dextro-camphoric acid) was obtained and structurally characterized. Complex 1 presents a 3D framework based on [Zn(BPDPE)](n) and [Zn(dca)](n) helical chains linking central metal ions, and exhibits ligand-based emission in the solution systems, which render it suitable as a bifunctional fluorescence sensing material for detecting nitro explosives and metal ions. Fluorescence titration experiments revealed that complex 1 has highly selective and sensitive fluorescence sensing performances for detecting picric acid (TNP) and Fe3+ ion through luminescence quenching. Furthermore, the luminescent intensities complex 1 were not weaken obviously after be regenerated at least four times. The sensing mechanisms of complex 1 as luminescent sensor have been studied as well.