Synthesis and crystal structure of [Zn(H2O)6]X2 . 8H2O (X = 4′,7-dimethoxylisoflavone-3′-sulfonate)

Abstract

A water soluble derivative of daidzein, [Zn(H2O)6] X2 ⋅ 8H2O (X = 4′,7-dimethoxylisoflavone-3′-sulfonate) was synthesized and its structure was determined by single-crystal X-ray diffraction analysis. Zn(II) is located on an inversion centre and octahedrally coordinated by six water molecules. [Zn(H2O)6]2+, C17H13O4SO3− and H2O form many hydrogen bonds, which consist of the hydrophilic areas of title compound. The isoflavone skeletons arrange in an antiparallel fashion. They form the hydrophobic areas of title compound and π ⋅s π stacking interactions exist among them. The sulfo-group is an important bridge as a structural link between the hydrophilic region and the hydrophobic region. The hydrogen bonds, π ⋅ π stacking interactions exist in its crystal structure, which assemble the moieties into a three-dimensional networking structure.