Mononuclear complex {[Cu(N-men)2(cda)2]·[Cu(N-men)2]-(ClO4)2} was synthesized by sodium carbamyldicyanomethanide Na(cda), N-methylethylenediamine and hydrate copper perchlorate. The crystal belongs to the triclinic system, space group P 1 with a = 7.229(2), b = 8.114(2), c = 15.936(4) A, α = 80.511(4), β = 78.993(4), r= 72.118(4)°, V = 867.6(3) A3, Z = 1, C20H44Cl2Cu2N14O10, Mr = 838.68, Dc = 1.605 g/cm3, F(000) = 434 and μ = 1.449 mm-1. The structure was refined to R = 0.0480 and wR = 0.1289 for 2503 observed reflections (I > 2σ(I)). In the complex there exist two kinds of coordination models for Cu (II) ions. One is that the Cu (II) ion is coordinated by four nitrogen atoms which are from two N-men molecules, and a slightly distorted square planar coordinate environment is formed around the Cu (II) ion; the other is that the Cu (II) ion is coordinated by six nitrogen atoms, of which four are from two N-men molecules and the left from nitrile groups, resulting in a distorted octahedron around the Mononuclear complex was synthesized from sodium carbamyldicyanomethanide Na (cda), N-methylethylenediamine and hydrate copper perchlorate. The crystal belongs to the triclinic system, space group P 1 with a = 7.229 (2), b = 8.114 (2), c = 15.936 (4) A, α = 80.511 (4), β = = 72.118 (4) °, V = 867.6 (3) A3, Z = 1, C20H44Cl2Cu2N14O10, Mr = 838.68, Dc = 1.605 g / cm3, F (000) = 434 and μ = 1.449 mm-1. to R = 0.0480 and wR = 0.1289 for 2503 observed reflections (I> 2σ (I)). In the complex there exist two kinds of coordination models for Cu (II) ions. One is that the Cu four nitrogen atoms which are from two N-men molecules, and a slightly distorted square planar coordinate environment are formed around the Cu (II) ion; the other is that the Cu (II) ion is coordinated by six nitrogen atoms, of which four are from two N-men molecules and the left from nitrile groups, resulting in a distorted oct ahedron around the