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 (ClO 4 ) 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 NO 2 ‐phen), have been synthesized and characterised. The magnetic susceptibility of complexes Cu(oxpn)Gd(NO 2 ‐phen)2(ClO 4 ) 3 .2H 2 O was measured over the 4–300 K and the observed data were successfully simulated by equation based on spin Hamiltonian operator (H = ‐2J 1 · S 2 ), 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.