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.