Metal-Organic framework based on N, N, N', N'-Tetrakis (4-carboxyphenyl)-1,4-phenylenediamine: Magnetic properties and selective luminescence sensing properties and DFT calculation

A linear fluorescent pyridyl ligand, 9,10-di(4-pyridyl)anthracene (dpa), and N,N,N',N'-Tetrakis(4-carbox-yphenyl)-1,4-phenylenediamine (H4TCPPDA) were selected as organic ligands to synthesize a new Co(II) metal-organic framework, namely {[Co2(TCPPDA)(dpa)(H2O)2]& sdot;3DMF & sdot;3H2O}n (CoMOF-s1). In the crystal structure of CoMOF-s1, the Co(II) was connected by TCPPDA4-and dpa to construct a three-dimensional framework, which features a 2, 4, 6-c network topology with the point symbol of {44.62.88.12}{44.62}{8}. Magnetic analyses revealed an overall antiferromagnetic coupling between two adjacent metal centers. Moreover, luminescence sensing experiments demonstrated that CoMOF-s1 displays highly sensitive and selectivity properties in the detection of nitrofuran antibiotics (nitrofurazone, NFZ, nitrofurantoin, NFT) with low detection limits of 0.15 mu M and 0.23 mu M, respectively. Furthermore, possible reasons for the quenching response were further explored by Powder X-ray diffraction (PXRD), UV-vis, and density functional theory (DFT) calculation.