A highly stable cadmium(II) metal-organic framework for detecting tetracycline and p-nitrophenol

A new metal -organic framework (MOF) {[Cd(L)0.5(4,4 '-bpy)0.5] <middle dot>H2O}n (1), where H4L=(1,1 ':4 ',1 ''-terphe- nyl)-2, 2 '',4,4 ''-tetracarboxylic acid, 4,4 '-bpy=4,4 '-bipyridine, was synthesized by hydro-solvothermal method. The structure of complex 1 was characterized by single -crystal X-ray diffraction, elemental analysis, powder X-ray diffraction, thermogravimetric analysis, and infrared spectrum analysis. The analysis of single crystal structure shows that 1 is a 3D structure, belonging to the monoclinic crystal system, C2/c space group. Cd(II) connects L4- and 4,4 ' bpy to form a 2D plane structure, and the layers are connected by L4- to form a 3D network structure. The MOF shows good stability and can be used for the detection of tetracycline (TET) and p-nitrophenol (4 -NP) by fluorescence quenching. The detection limits of TET and 4 -NP were 0.15 and 0.062 mu mol center dot L-1, respectively. In addition, the fluorescence quenching mechanism of 1 was also studied. 1 can be successfully applied to the determination of TET and 4 -NP content in Yanhe water samples. CCDC: 2264479.