Abstract
The asymmetric unit of the title compound, tetraaquatetrakis{mu(3)-6,6 '-dioxido-2,2 '-[1,2-phenylenebis(nitrilomethyl-idyne)] diphenolato}octazinc(II) dimethyl sulfoxide tetra-solvate dihydrate, [Zn-8(C20H12N2O4)(4)(H2O)(4)]center dot 4C(2)H(6)OS center dot-2H(2)O, contains one quarter of a Zn-II octanuclear complex with (4) over bar symmetry, one dimethyl sulfoxide molecule and one half of a water molecule which lies on a twofold rotation axis. The Zn-II atoms of the octanuclear complex have two different five-coordinate environments, viz. ZnN2O3 and ZnO5. All eight Zn-II centers adopt a distorted square-pyramidal coordination; four Zn-II ions have the N2O2 tetradentate Schiff base ligand bound in a basal plane and the coordinated water molecule occupying the apical site, while the remaing four Zn-II ions are bound by five O atoms from three Schiff base ligands. In the crystal structure, Zn-II complex molecules, coordinated and uncoordinated water molecules and dimethyl sulfoxide molecules are linked via O-H center dot center dot center dot O and C-H center dot center dot center dot O hydrogen bonds and C-H center dot center dot center dot pi interactions, forming a three-dimensional framework.