Abstract
Two new Cd (II) metal-organic frameworks (MOFs), {[Cd (L)0.5]·1.2DMF·H2O} n (1) and [Cd(H2L) (1, 2-die)2] n (2) [H4L = [1, 1′:4′, 1′'-terphenyl]-2, 2′', 4, 4′'-tetracarboxylic acid, 1,2-die = 1,2-di(pyridin-4-yl) ethane], have been synthesized under hydro(solvo)thermal conditions and structurally characterized by X-ray single crystal diffraction. 1 is a three-dimensional framework (3D) formed by the connections between layers, whereas 2 is a one-dimensional (1D) chain structure. Fluorescence sensing experiments show that both 1 and 2 can detect 2, 4, 6-trinitrophenol (TNP) and 2 has a lower detection limit. The detection limits of 1 and 2 were 0.18 μmol·L-1 and 0.054 μmol·L-1, respectively. However, their detection of anions is different, 1 can selectively detect MnO4-, and the detection limit is 0.38 μmol·L-1. 2 can selectively detect CrO42-, and the detection limit is 0.84 μmol·L-1. This indicates that different nitrogen-containing ligands have significant effects on the structure and properties of MOFs. In addition, 2 was used for the detection of sulfasalazine (SECT) in aqueous solution, and the detection limit is 0.29 μmol·L-1. Finally, the mechanism of fluorescence quenching was thoroughly investigated.
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