A neutral cubane with a ZnII4O4 core: tetrabenzoatotetrakis(μ3-hydroxydi-2-pyridylmethanolato)tetrazinc(II)–acetone–methanol (1/2/1)

In the title compound, [Zn 4 (C 11 H 9 N 2 O 2 ) 4 (C 7 H 5 O 2 ) 4 ]·2(CH 3 ) 2 CO·CH 3 OH, the tetranuclear molecule lies on a fourfold inversion axis. Zn II ions and μ 3 -O atoms in the cubane core occupy alternating vertices, forming two interpenetrating tetrahedra. Each Zn II ion is further coordinated by two N atoms from two different (py) 2 C(OH)O ligands (py is pyridyl) and one O atom from a monodentate benzoate ligand, forming a distorted octahedral environment. The (py) 2 C(OH)O ligand acts in an η 1 :η 3 :η 1 :μ 3 manner, forming two five-membered ZnNCCO chelating rings with two different Zn II atoms sharing a common C—O bond, and an alkoxide-type bond to a third Zn II ion. There are four symmetry-related intramolecular O—H...O hydrogen bonds between the two types of ligands. In the asymmetric unit, there is a half-occupancy acetone solvent molecule and a half-occupancy methanol solvent molecule that lies on a twofold rotation axis.

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