Byeong Kwon Park

Tetra-μ-benzoato-bis-[(quinoxaline)copper(II)].

The paddlewheel-type centrosymmetric dinuclear title complex, [Cu2(C7H5O2)4(C8H6N2)2], contains four bridging benzoate groups and two terminal quinoxaline ligands. The octahedral coordination around each Cu atom, with four O atoms in the equatorial plane, is completed by an N atom of a quinoxaline molecule [Cu—N = 2.2465 (18) Å] and by the second Cu atom [Cu⋯Cu = 2.668 (5) Å]. The Cu atom is 0.216 Å out of the plane of the four O atoms.

Tetra-μ-benzoato-bis­[(3-methyl­quinoline)copper(II)](Cu—Cu)

In the title compound, [Cu2(C7H5O2)4(C10H9N)2], the paddle-wheel-type dinuclear complex molecule contains four bridging benzoate groups and two terminal 3-methylquinoline ligands. The asymmetric unit contains one and a half molecules with a total of three independent Cu atoms; there is an inversion center at the mid-point of the Cu⋯Cu bond in one molecule. The octahedral coordination of each Cu atom, with four O atoms in the equatorial plane, is completed by an N atom of a 3-methylquinoline ligand [Cu—N = 2.190 (4)–2.203 (3) Å] and by another Cu atom [Cu⋯Cu = 2.667 (1) and 2.6703 (7) Å]. The Cu atoms are all ca 0.22 Å out of the plane of the four bonded O atoms.