Zinc(II) Complex with 1,2-Bis(2-Pyridyl-1,2,4-Triazol-3-yl)ethane and Dianions of 1-Hydroxyethane-1,1-Diphosphonic Acid

The reaction of ZnSO4·7Н2О with 1,2-bis(2-pyridyl-1,2,4-triazol-3-yl)ethane (Н2L) and 1‑hydroxyethane-1,1-diphosphonic acid (H4EDP) in an aqueous medium affords complex {[Zn2(H2L)(H2EDP)2(H2O)2]·2H2O}n, which is studied by elemental analysis and IR spectroscopy. The structure of the complex is determined by X-ray diffraction analysis (CIF file CCDC no. 2043698). The complex has the 1D polymeric structure and represents a zigzag chain in which two zinc(II) cations are joined by two bis(phosphonate) anions into the centrosymmetric binuclear fragments linked by the bridging bis(triazolyl)ethane molecules. The zinc(II) cation additionally coordinates the water molecule and exists in the distorted octahedral coordination environment. The luminescence spectrum of the complex exhibits a broad emission band with a maximum at 408 nm and a quantum yield of 4%.