A Pyridazine-Based Cadmium(II) Organic Framework With pcu Topology as a Luminance Sensor to Nitrobenzene, Al(III), and Cu(II) Ion

Abstract

In the field of water decontamination, the design of luminance sensor for sensitive detection of heavy metal ion toxic and nitroaromatic compounds are important and challenging. Herein, a new luminescent Cd(II) metal–organic framework (MOF), {[Cd₂(H₂O)₃(4-CPCA)₂]·2H₂O}_n (SNUT-27) (H₂(4-CPCA) = 1-(4-carboxyphenyl)-4-oxo-1,4-dihydropyridazine-3-carboxylic acid) was obtained by the reaction of flexible ligand H₂(4-CPCA) and Cd(II) ions, characterized by single crystal X-ray diffraction, PXRD, FT-IR, and TGA, the samples were further analyzed. The analysis of single crystal X-ray diffraction showed that SNUT-27 possesses a distinct three-dimensional spatial arrangement and demonstrates impressive fluorescence properties. Particularly, SNUT-27 showed a highly sensitive response to the nitro-aromatic compounds nitrobenzene by fluorescence quenching, and in contrast, showed a fluorescence enhancement response to Al³⁺ and Cu²⁺. SNUT-27 can be effortlessly recycled by simply rinsing with water post-sensing experiments, showcasing its reusability. Additionally, potential detection mechanisms have been explored.