Abstract

Excessive discharge of metal ions, such as Fe3+ and Cr2O72–/CrO42– may bring about potential threats to human health and the ecological environment. Consequently, the assembly of function-oriented materials as effective chemosensors has the vital practical significance. In this article, four metal-organic frameworks (MOFs), namely, {[Co(bptb)0.5(bibp)(H2O)2]·H2O}n (Ι), [Mn4(bptb)2(bibp)3(H2O)4]n (Ⅱ), [Ni2(bptb)(bipy)2(H2O)3]n (Ⅲ) and [Cd3(bptb)2(bipb)3(H2O)4]n (Ⅳ) (H4bptb = 2,4,4′,6-biphenyl tetracarboxylic acid, bibp = 4,4′-bis (imidazolyl) biphenyl, and bipy = 4,4′-bipyridine) have been hydrothermally synthesized, and their structures and physicochemical properties have been characterized and investigated. Single-crystal X-ray diffraction analysis reveals that they present fascinating three-dimensional configurations. Powder X-ray diffraction as well with thermogravimetric analysis demonstrates that Cd-MOF (Ⅳ) exhibits a high chemical and thermal stability. The studies of fluorescence properties show that Ⅳ may serve as a multi-responsive sensor for Fe3+ and Cr2O72–/CrO42– ions with high sensitivity, selectivity and efficiency. Moreover, the fluorescence quenching mechanisms have been studied systematically depend on the inductively coupled plasma-atomic emission spectrometer (ICP-AES), X-ray photoelectron spectroscopy (XPS) analyses, PXRD analysis, FT-IR spectra, UV–vis spectra and SEM mapping (scanning electron microscope). In addition, magnetic and cyclic voltammetry (CV) properties of Ι−Ⅲ have also been investigated.

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