Diaquabis[1-hydroxy-2-(imidazol-3-ium-1-yl)-1,1′-ethylidenediphophonato-κ2O,O′]zinc(II)

Abstract

In the title complex, [Zn(C5H9NO7P2)2(H2O)2], the zinc atom is coordinated by two bidentate zoledronate [zoledronate = (2-(1-imidazole)-1-hydroxy-1,1′-ethylidenediphophonate)] ligands and two water molecules. The coordination number is 6. There is one half-molecule in the asymmetric unit with the zinc atom located on a crystallographic inversion centre. The anion exists as a zwitterion with an overall charge of −1; the protonated nitrogen in the ring has a positive charge and the two phosphonates groups each have a single negative charge. There are two intramolecular O—H...O hydrogen bonds. The molecules are linked into a chain by intermolecular O—H...O hydrogen bonds. Adjacent chains are further linked by O—H...O hydrogen bonds involving the aqua ligands. An N—H...O interaction is also observed.