Tetrakis[μ-1,4-bis(4,5-dihydro-1,3oxazol-2-yl)benzene-k2N:N′]tetrakis(μ-methanolato-k2O:O)bis(μ-perchlorato-k2O:O′)tetracopper(II) bis(perchlorate)

The title tetranuclear Cu-II complex, [Cu-4(C12H12N2O2)(4)-(CH3O)(4)(ClO4)(2)](ClO4)(2), is located around an inversion center. Each Cu-II atom is coordinated by two cis-O atoms from two bridging methanolate anions and two cis-N atoms from two bridging 1,4-bis(4,5-dihydro-1,3-oxazol-2-yl)benzene (L) ligands in the basal plane, and is further coordinated by one O atom of the bridging perchlorate anion, forming a distorted square-pyramidal geometry. The Cu center dot center dot center dot Cu separations in the rectangular core are 2.9878 (11) and 6.974 (1) angstrom. In the asymmetric unit, there are two L ligands with a syn conformation. In one L ligand, the dihedral angles between the central benzene ring and the terminal 4,5-dihydro-1,3-oxazol-2-yl mean planes are 22.1 (4) and 33.1 (4)degrees, and in the other L ligand the corresponding dihedral angles are 29.3 (4) and 29.9 (4)degrees. The uncoordinated perchlorate anion is linked with the complex molecules via weak C-H center dot center dot center dot O hydrogen bonds.