A new 3D Cd(II)-based metal-organic framework as dual-function luminescent sensor to ions and antibiotic: Mechanism and theoretical studies

A new Cd(II) metal-organic framework (Cd-MOF), namely [Cd2(L)(H2O)3.3.4H2O]n (1) (H4L = (3-(2,4-dicarboxylphenyl)-2,6-dicarboxylpyridine)) was effectively produced. 1 shows a new 3D 3,5-connected network with gra topology built by the multi-carboxylate linker through (kappa 2)-(kappa 1)-mu 2, (kappa 1)-(kappa 1)-mu 1 and (kappa 0)-(kappa 1)-mu 1 coordination modes. The sensing results showed that 1 would be a viable possibility for developing luminous sensors to sensitively probe nitrofurazone (NFZ), Fe3+, and CrO42-. The limits of detection (LODs) for Fe3+, CrO42-and NFZ were calculated to be 1.17 x 10-7 M-1, 1.63 x 10-7 M-1 and 7.03 x 10-8M-1, respectively. Density functional theory (DFT), UV-vis spectroscopy, and PXRD research have reinforced the understanding of luminescence sensing mechanisms.