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The title complex, [Cu(4)(C(14)H(15)ClN(3)O(4))(2)(ClO(4))(2)(C(6)H(16)N(2))(2)], is a tetra-nuclear copper(II) complex lying about an inversion center wherein a cis-oxamide group is coordinated to both Cu atoms with bite angles of 84.45 (6) and 84.08 (10)°. Both Cu atoms adopt distorted square-pyramidal coordination geometries. The apical position of one Cu atom is occupied by an O atom from a perchlorate group, with a Cu-O bond length of 2.519 (7) Å, while the apical site of the other Cu atom is occupied by a carboxyl-ate O atom with a Cu-O distance of 2.281 (3) Å. The Cu atoms bridged by oxamide and carboxyl-ate-group bridges are separated by 5.204 (6) and 5.603 (2) Å, respectively. The crystal structure is consolidated by weak inter-molecular C-H⋯O inter-actions. Two perchlorate O atoms are disordered with unequal site-occupancy factors.

acta crystallographica. section e

Bis{μ3-cis-N-(2-carboxylato-5-chlorophenyl)-N′-[3-(dimethylamino)propyl]oxamidato(3−)}bis(perchlorato-κO)bis(N,N,N′,N′-tetramethylethylenediamine)tetracopper(II)