A zinc-based metal-organic framework for fluorescence detection of trace Cu2+

A novel extremely effective fluorescent zinc organic framework probe [Zn-6(L)(3)(2, 2'-bpy)(4)]center dot 2H(2)O}(n) (Zn-MOF) for Cu2+ was prepared by a hydro-solvothermal method, where H4L=1,4-bis(3,5-dicarboxyphenoxy) benzene and 2,2'-bpy=2,2'-bipyridine. Its synthesis, structure, thermal stability, and fluorescence sensing properties are described in this paper. Zn-MOF is capable of identifying Cu2+ and shows good stability according to the fluorescence quenching method. The fluorescence intensity of the Zn-MOF has demonstrated an essential linear connection with the Cu2+ concentration in a concentration range of 0.1.2 mu mol.L-1, with a low limit of detection (LOD) of 67.1 nmol.L-1. More crucially, the obtained results indicating that Zn-MOF selectively recognizes Cu2+ through weak interactions are corroborated by a systematic analysis of X-ray photoelectron spectroscopy, inductively coupled plasma. mass spectrometry, powder X-ray diffraction, and infrared spectra. Furthermore, this Zn-MOF demonstrates strong regeneration capability in five consecutive cycles. CCDC: 2349882.