Crystal structure of a copper(II) complex with 2,3-dioxo-5,6 : 13,14-dibenzo-9-methyl-7-12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene

The molecular and crystal structure of a macrocyclic N,N'-substituted-oxami docopper(II) complex, [CuL], where H2L = 2,3-dioxo-5,6:13,14-dibenzo-9-meth yl-7,12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene, has been determined by X-ray diffraction method. Crystal data: C25H24CuN4O6, M -r = 540.02, monoclinic, space group C2/c, a = 25:605(4), b = 9.230(2), c = 22.105(4) Angstrom, beta = 111.749(4)degrees, V = 4852(2) Angstrom (3), Z = 8, D-c = 1.478 g/cm(3), mu (Mo-K alpha) = 0.949 mm(-1), F(000) = 2232, R = 0.0681 and wR = 0.1666 for 2747 observed reflections with I greater than or equal to 2 sigma (I). The copper atom is located in the coordination cav ity formed by the four nitrogen donors of the deprotonated macrocyclic oxam ido ligand with a distorted square-planar geometry. In the crystal, two mol ecules are connected by the Cu . . .O weak coordination bonds to produce a supramolecular quasi-dimer.