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 ZnII 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—H⋯O hydrogen bonding results in the formation of a non-planar six-membered ring. In the crystal structure, strong intra- and intermolecular O—H⋯O hydrogen bonds link the molecules into a three-dimensional network. π–π contacts between benzimidazole rings [centroid–centroid distance = 3.899 (1) Å] may further stabilize the structure.
Highlights
H atoms treated by a mixture of independent and constrained refinement max = 0.98 e Å3
ZnII centre (1 symmetry) form a distorted square-planar arrangement, while the distorted octahedral coordination geometry is completed by the O atoms of the zwitterionic 2methylbenzimidazolium-1,3-diacetate ligands in the axial positions
Symmetry codes: (ii) x−1/2, −y+1/2, z−1/2; (iii) −x−1, −y+1, −z; (iv) x−1, y, z; (v) x+1/2, −y+1/2, z+1/2
Summary
H atoms treated by a mixture of independent and constrained refinement max = 0.98 e Å3. R factor = 0.036; wR factor = 0.097; data-to-parameter ratio = 13.5. [Zn(C12H11N2O4)2(H2O)4]4H2O, contains one-half of the complex molecule and two uncoordinated water molecules
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