Acta Cryst. (2009). E65, m1430-m1431  [ doi:10.1107/S160053680904286X ]

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

E. Freire and D. R. Vega

Abstract: In the title complex, [Zn(C₅H₉NO₇P₂)₂(H₂O)]·2H₂O, the zinc atom is coordinated by two zoledronate anions [zoledronate = (2-(1-imidazole)-1-hydroxy-1,1'-ethylidenediphophonate)] and one water molecule. The coordination number is 5. There is one half-molecule in the asymmetric unit, the zinc atom being located on a twofold rotation axis passing through the metal centre and the coordinating water O atom. 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. Intermolecular O-HO hydrogen bonds link the molecules. An N-HO interaction is also present.

Online 23 October 2009

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