Two Novel Lanthanide Metal-Organic Frameworks: Selective Luminescent Sensing for Nitrobenzene, Cu2+, and MnO4-

Two novel lanthanide metal-organic frameworks (Ln-MOFs), formulated as {[Ln(2) (L2)(2) (H2O)(5)]center dot 3H(2)O}n (Nd 1 and Eu 2) has been acquired under hydrothermal conditions, in which H(3)L2 ligand was derived from in situ decarboxylation reaction of H(4)L1 ligand (H(3)L2 = 5(3',5'-dicarboxylphenyl)picolinic acid, H(4)L1 = 3(3',5'-dicarboxyphenyl)pyridine-2,6-dicarboxylic acid). Both compounds possess (3,4,7)-connected 3,4,7T22 topology with a schlafli symbol of {4(3)}{4(5).6}{4(8).6(9).8(4) }. 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.