A Eu(iii) metal-organic framework based on anthracenyl and alkynyl conjugation as a fluorescence probe for the selective monitoring of Fe 3+ and TNP.

In this work, a luminescent metal-organic framework (Eu-MOF {[Eu 6 L 6 (μ 3 -OH) 8 (H 2 O) 3 ] 8 ·H 2 O} n ) was constructed by a solvothermal method with a linear organic ligand L (10-[(2-amino-4-carboxyl-phenyl)ethynyl]anthracene-9-carboxylic acid) based on anthracene and alkyne groups and using Eu 3+ as the metal center. The MOF exhibits a stable UiO-66 crystal structure, and a six-core cluster twelve-linked secondary structural unit was successfully synthesized using 2-fluorobenzoic acid as a modulator, forming a classical fcu topology. Moreover, it exhibits good chemical stability. Interestingly, Eu-MOF exhibited high selectivity and sensitive fluorescence burst properties towards Fe 3+ ions and 2,4,6-trinitrophenol (TNP) in DMF solution. For Fe 3+ , the K SV value is 5.06 × 10 5 M -1 and the LOD value is 5.1 × 10 -7 M. For TNP, the K SV value is 1.92 × 10 4 M -1 and the LOD value is 1.93 × 10 -6 M. In addition, Eu-MOF showed good anti-interference ability and fast response. This work provides an excellent fluorescent sensor for the detection of Fe 3+ and 2,4,6-trinitrophenol (TNP) residues in contaminants.