Synthesis, X-ray crystal structure and magnetic study of a μ_1,5-dca bridged dimeric copper(II) complex

The reaction of aqueous solution of copper(II) nitrate trihydrate with methanolic solution of the ligand HL and sodium dicyanamide in aqueous medium results in the formation of a dimeric dicyanamide complex of Cu(II), [Cu ₂(L)₂(µ_1,5-dca)₂]•0.5 H ₂O (1) [where L = 1-(N-salicylideneamine)-2-(N-ethyl)-aminoethane]. The single crystal X-ray structure reveals that the asymmetric unit of complex 1 consists of two dinuclear units. The complex crystallizes in the monoclinic space group P2₁ with cell parameters, a = 9.8828(19) Å, b = 19.018(4) Å, c = 14.851(3) Å, (°) = 92.979(6) and Z = 4. ?_M T, stays in the 0.94-0.91 cm³ mol^-1K range between 300 and 2 K, which is slightly higher than the spin-only value (?_M T = 0.75 cm³mol^-1K) for two uncoupled copper(II) (S = 1/2) ions assuming g = 2.0, thus indicating that the complex 1 behaves like a simple paramagnet. © 2011 Springer Science+Business Media, LLC.