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metal-organic compounds
The zinc alkoxide molecules in di-μ3-ethanolato-diethyltetrakis(μ2-2-methyl-4-oxo-4H-pyran-3-olato-κ3O3,O4:O3)tetrazinc(II), [Zn4(C2H5)2(C2H5O)2(C6H5O3)4], (I), and bis(μ3-2-ethoxyphenolato-κ4O1,O2:O1:O1)bis(μ2-2-ethoxyphenolato-κ3O1,O2:O1)bis(μ2-2-methyl-4-oxo-4H-pyran-3-olato-κ3O3,O4:O3)bis(2-methyl-4-oxo-4H-pyran-3-olato-κ2O3,O4)tetrazinc(II) toluene disolvate, [Zn4(C6H5O3)4(C8H9O2)4]·2C7H8, (II), lie on crystallographic centres of inversion. The asymmetric units of (I) and (II) contain half of the tetrameric unit and additionally one molecule of toluene for (II). The ZnII atoms are four- and six-coordinated in distorted tetrahedral and octahedral geometries for (I), and six-coordinated in a distorted octahedral environment for (II). The ZnII atoms in both compounds are arranged in a defect dicubane Zn4O6 core structure composed of two EtZnO3 tetrahedra and ZnO6 octahedra for (I), and of four ZnO6 octahedra for (II), sharing common corners. The maltolate ligands exist mostly in a μ2-bridging mode, while the guetholate ligands prefer a higher coordination mode and act as μ3- and μ2-bridges.
