Two Novel Lanthanide Metal–Organic Frameworks: Selective Luminescent Sensing for Nitrobenzene, Cu<sup>2+</sup>, and MnO<sub>4</sub><sup>–</sup>
Zan Sun, Juan Sun, Lu Xi, Jing Xie, Xiufeng Wang, Yue Ma, Licun Li
Abstract
Two novel lanthanide metal–organic frameworks (Ln-MOFs), formulated as {[Ln2(L2)2(H2O)5]·3H2O}n (Nd 1 and Eu 2) has been acquired under hydrothermal conditions, in which H3L2 ligand was derived from in situ decarboxylation reaction of H4L1 ligand (H3L2 = 5-(3′,5′-dicarboxylphenyl)picolinic acid, H4L1 = 3-(3′,5′-dicarboxyphenyl)pyridine-2,6-dicarboxylic acid). Both compounds possess (3,4,7)-connected 3,4,7T22 topology with a schläfli symbol of {43}{45·6}{48·69·84}. Compound 2 displays excellent luminescence properties and exhibits good stability in water and other common organic solvents. In particular, 2 can detect Cu2+ ion, MnO4– anion, and nitrobenzene with a high sensitivity and selectivity through the fluorescence quenching effect. Thus, 2 can be dressed up as a prospective luminescent sensor for detecting Cu2+, MnO4–, and nitrobenzene.