Synthesis and magnetic properties of copper (II)-lanthanoid (III) binuclear complexes with N, N′-bis(3-aminopropyl) oxamido ligand

Six novel μ-oxamido binuclear complexes, namely Cu(axpn)Ln(L)2(ClO4)3 (Ln: Eu, Gd, Tb, Nd, Ho, Er), where oxpn is N,N'-bis(3-aminopropyl) oxamido, L denotes 5-nitro,10-phenanthroline (abbreviated as NO2-phen), have been synthesized and characterised. The magnetic susceptibility of complexes Cu(oxpn)Gd(NO2-phen)2(ClO4)3.2H2O was measured over the 4–300 K and the observed data were successfully simulated by equation based on spin Hamiltonian operator (H = -2J1 · S2), giving the exchange integral J(Cu-Gd)=-1.62 cm−1. This indicates a weak antiferromagnetic interaction between the Cu(II) and Gd(III) ions.