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-oxamidocopper(Ⅱ) complex, CuL], where H2L = 2,3-dioxo-5,6:13,14-dibenzo-9-methyl-7,12-bis(ethoxycarbonyl)-1,4,8,11-tetraazacyclotetradeca-7,11-diene, has been determined by X-ray diffraction method. Crystal data: C25H24CuN4O6, Mr = 540.02, monoclinic, space group C2/c, a =25.605(4), b = 9.230(2), c = 22.105(4) A, β = 111.749(4)°, V= 4852(2) A3, Z = 8, Dc = 1.478g/cm3,μ (Mo-Kα) = 0.949 mm-1, F(000) = 2232, R = 0.0681 and wR = 0.1666 for 2747 observed reflections with Ⅰ≥ 2σ(Ⅰ). The copper atom is located in the coordination cavity formed by the four nitrogen donors of the deprotonated macrocyclic oxamido ligand with a distorted square-planar geometry.In the crystal,two molecules are connected by the Cu…O weak coordination bonds to produce a supramolecular quasi-dimer.