title: Tetra-kis[μ-1,4-bis-(4,5-dihydro-1,3-oxazol-2-yl)benzene-κN:N']tetra-kis-(μ-methano-lato-κO:O)bis-(μ-perchlorato-κO:O')tetra-copper(II) bis-(perchlorate).
abstract: The title tetra-nuclear Cu(II) complex, [Cu(4)(C(12)H(12)N(2)O(2))(4)(CH(3)O)(4)(ClO(4))(2)](ClO(4))(2), is located around an inversion center. Each Cu(II) atom is coordinated by two cis-O atoms from two bridging methano-late 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⋯Cu separations in the recta-ngular core are 2.9878 (11) and 6.974 (1) Å. 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)°, and in the other L ligand the corresponding dihedral angles are 29.3 (4) and 29.9 (4)°. The uncoordinated perchlorate anion is linked with the complex mol-ecules via weak C-H⋯O hydrogen bonds.
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Yeh
authors.forename: Fu-Chang
authors.initials: FC
authors.lastname: Huang
authors.forename: Ay
authors.initials: A
authors.lastname: Jong
authors.forename: Maw-Cherng
authors.initials: MC
authors.lastname: Suen
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677
references.citation: Acta Crystallogr Sect E Struct Rep Online. 2011 Jul 1;67(Pt 7):m881
references.pmid: 21836874