Acta Cryst. (2009). E65, m1428-m1429  [ doi:10.1107/S1600536809042858 ]

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

E. Freire and D. R. Vega

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-HO hydrogen bonds. The molecules are linked into a chain by intermolecular O-HO hydrogen bonds. Adjacent chains are further linked by O-HO hydrogen bonds involving the aqua ligands. An N-HO interaction is also observed.

Online 23 October 2009

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