Highly Selective and Sensitive Lanthanoids Coordination Polymers Sensors for Trans, Trans-Muconic Acid, a Biomarker of Benzene

Two series of new coordination polymers (CPs) based on trivalent lanthanoids and 4-(pyridyl-N-oxide) methylphosphonic acid (H2L), namely, {[Ln(2)(L)(2)(H2O)(5)]2Cl center dot 2H(2)O}(n) (Ln = Eu(1), Tb(2), Dy(3)) and [Ln(L) (OH)(H2O)](n) (Ln = Eu(4), Tb(5), Dy(6)) have been obtained under hydrothermal conditions and characterized by single-crystal X-ray diffraction(SXRD), powder X-ray diffraction(PXRD) and so on. The single-crystal X-ray diffraction results show that complexes 1-3 are isomorphic with 3D framework structures, while isomorphic complexes 4-6 show 2D layered structures. Photoluminescent spectra of complexes 1 and 2 exhibits the strong luminescence characteristic of Eu(III) and Tb(III) ions, respectively. Interestingly, complex 1 can act as a sensor baesd on fluorescence sensing method for detecting trans, trans-muconic acid (tt-MA), biomarker of benzene, with excellent sensitivity, great selectivity and the low LOD for ttMA which is 2.89 mu M. However, the magnetic behaviors of complexes 2, 3, 5 and 6 reveal the presence of antiferromagnetic between the lanthanoid ions. (C) 2020 Elsevier Ltd. All rights reserved.