Luminescent Cd coordination polymer: synthesis, crystal structure and its application as a dual-responsive chemosensor for 4-nitroaniline and CrO42− in water

Abstract

Abstract A novel highly fluorescent cadmium metal–organic framework, [Cd (DPTTZ) (OBA)] (IUST-3), synthesized by using two linkers 2, 5-di (pyridine-4-yl) thiazolo [5, 4-d] thiazole (DPTTZ) and 4, 4'- oxybis (benzoic acid) (OBA) simultaneously, which exhibits a two-dimensional framework. The characteristics of this Cd-MOF were investigated by single-crystal X-ray diffraction (SXRD), fourier transform infrared spectroscopy (FT-IR), elemental analysis (EA), powder X-ray diffraction (PXRD), and thermogravimetry analysis (TGA). IUST-3 exhibits excellent luminescence property and good stability in water. Luminescent experiments indicate that IUST-3 has remarkable sensitivity and selectivity for the detection of 4-nitroaniline (4-NA), and CrO42– anion with KSV = 1.03×105 M-1 (4-NA) and KSV = 2.93×104 M-1 (CrO42–) and low limit of detection 0.52 µM (4-NA) and 1.37 µM (CrO42–). In addition, the possible fluorescence quenching mechanism was explored in this paper.