Structural Regulation of Four New d¹⁰ Coordination Polymers and Their Fluorescent Detection Properties for Nitro Compounds in Water

Four coordination polymers were synthesized by two fluorescently active metal Zn/Cd(II) via pyrazinamide-based ligand [N,N′-bis[(3-pyridyl)arylphenolone]piperazine (L) and mono-/di-carboxylic acids under hydrothermal conditions, namely, [Zn(L)(HPTA)₂(H₂O)], [Cd(L)(HPTA)₂(H₂O)]∙2H₂O, [Zn(L)_0.5(1,4-H₂BDC)(H₂O)]∙H₂O, [Cd(L)_0.5(1,4-H₂BDC)(H₂O)]∙H₂O and characterized by IR, PXRD and single crystal X-ray diffraction. The title complexes are from 1D “W”-shaped chains to 6-connected layers based on carboxylates and L ligands mixed linkers. The effect of metal and carboxylate on the structures of the title complexes were investigated. As fluorescent sensors for nitroaniline (NA) and nitrophenol (NOP), the title complexes show good recoverability, low LOD and high sensitivity. The applicability of [Cd(L)_0.5(1,4-H₂BDC)(H₂O)]∙H₂O was demonstrated by testing NOP and NA in three different aqueous environments (tap water, river water and wastewater). The corresponding modified detection paper and cloth were prepared and used for the recognition of NOP and NA.