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) ?, ( = 111.749(4)(, V = 4852(2) ?3, Z = 8, Dc = 1.478 g/cm3, μ (Mo-K() = 0.949 mm-1, F(000) = 2232, R = 0.0681 and wR = 0.1666 for 2747 observed reflections with I ( 2((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.