A Recyclable bi-functional Luminescent Zinc (II) metal-organic framework as highly selective and sensitive sensing probe for nitroaromatic explosives and Fe3+ ions

By introducing carboxyl tag to the aromatic ligands system and borrowing the organic template open framework idea, a stable fluorescent Zn metal-organic framework was successfully prepared through a rigid ligand H6L (3,5-bis-(3-carboxyphenoxy)benzoic acid) under hydrothermal conditions. The selectivity and sensitivity of the Zn-MOF to metal ions and nitro-aromatic compounds (NACs) were investigated by fluorescence quenching. And the Zn-MOF showed a high sensibility of nitro-aromatic compounds (NACs) and Fe3+ ions, especially for 4-(4-nitropheny lazo) resorcinol (NPLR). More importantly, the detection limit of the Zn-MOF for detecting NPLR solution was found to be 1.71 ppb. Moreover, this sensor is remarkable recyclable and is promisingly applied for rapid, on-site and sensing of explosive residuals.