Acta Cryst. (2009). E65, m1091  [ doi:10.1107/S1600536809031766 ]

Tetraaquabis(2-methylbenzimidazolium-1,3-diacetato-O)zinc(II) tetrahydrate

H.-C. Lian, Q.-L. Ni, X.-F. Jiang, Z.-M. Cen and J.-H. Lin

Abstract: The asymmetric unit of the title compound, [Zn(C₁₂H₁₁N₂O₄)₂(H₂O)₄]·4H₂O, contains one-half of the complex molecule and two uncoordinated water molecules. The four water O atoms in the equatorial plane around the Zn^II centre ( symmetry) form a distorted square-planar arrangement, while the distorted octahedral coordination geometry is completed by the O atoms of the zwitterionic 2-methylbenzimidazolium-1,3-diacetate ligands in the axial positions. The benzimidazole ring system is planar, with a maximum deviation of 0.041 (3) Å. Intramolecular O-HO hydrogen bonding results in the formation of a non-planar six-membered ring. In the crystal structure, strong intra- and intermolecular O-HO hydrogen bonds link the molecules into a three-dimensional network. - contacts between benzimidazole rings [centroid-centroid distance = 3.899 (1) Å] may further stabilize the structure.

Online 19 August 2009

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