Facile fabrication and luminescence properties of a new ZnII coordination polymer-based fluorescent sensor toward antibiotics

Abstract

Due to the excellent fluorescence properties of organic fluorescent ligand 4,7-bi(1H-imidazol-1-yl)benzo-[2,1,3]thiadiazole (BIBT), luminescent coordination polymers (CPs) or metal–organic frameworks constructed from BIBT have received our attention. In this work, by the self-assembly of BIBT and Zn(II) ions, the formation of a two-dimensional (2D) CP with a formula [Zn₂(BIBT)(AIPA)₂]_n (JXUST-17, H₂AIPA = 5-aminoisophthalic acid) has been achieved. X-ray single-crystal diffraction analysis reveals that the adjacent Zn^II ions are connected by amino and carboxylate groups from AIPA²⁻ ligands to form a 2D layer structure and the neighboring layers are further linked by BIBT ligands to construct a 2D double-layer structure. Luminescence investigation suggests that JXUST-17 not only possesses excellent detection capability but also exhibits excellent selectivity toward nitrofurantoin (NFT) and 2.6-dichloro-4-nitroaniline (DCN). Furthermore, mixed matrix membranes are developed by the dispersion of JXUST-17 with polymethyl methacrylate in DMA solution to realize a rapid and visualizable luminescence response towards NFT.