A water-stable 3-fold parallel interpenetrated Cd(II) coordination polymer as multi-responsive luminescent sensor for detecting Fe3+, Cr2O72− and FZD in aqueous media

Excessive release of inorganic and organic hazardous chemical pollutants have posed a great threat to public health and human sustainable development. Therefore, the detection of these hazardous chemicals become very important but challenging. In this work, a methyl-decorated acylamide-containing dicarboxylate ligand H2L was designed and synthesized. By using H2L and bpp ligands reacted with Cd(II) ions, a new coordination polymer {[Cd(L)(bpp)]⋅DMF⋅2H2O}n (1) was solvothermally synthesized and characterized. Single-crystal X-ray diffraction suggests that 1 features an interesting 3-fold parallel interpenetrated structure based on three 2D sql layers through π-π and CH⋅⋅⋅π interactions, in which the uncoordinated acylamide groups are found and facilitate 1 to recognize analyte molecules. Complex 1 shows good water stability and luminescent property. The luminescent sensing experiments show that 1 could serve as a multi-responsive luminescent sensor for sensitive, selective and recyclable detecting Fe3+, Cr2O72− and furazolidone (FZD) in aqueous solution. The corresponding luminescent quenching mechanisms have also been discussed. Furthermore, complex 1 was successfully applied to determine Fe3+, Cr2O72− and FZD in real water samples.