Synthesis and Magnetism of Novel μ-Oxamido Heterotetranuclear Complexes [Cu₃^IILn^III] (Ln = Gd, Nd)

Abstract

Two novel μ-oxamido heterotetranuclear complexes have been synthesized, namely Cu3Gd(oxpn)3(NO₃)3 and Cu3Nd(oxpn)₃(NO₃)3 2H₂O, where oxpn is N,N′-bis(3-aminopropyl)oxamide. The Complex Cu3Gd(oxpn)₃(NO₃)3 was characterized by variable temperature magnetic susceptibility (4–300K) studies. The magnetic susceptibility data was successfully simulated by the equation based on the Heisenberg model, H = −2J(Ŝ₁ Ŝ₀ + Ŝ₂ Ŝ₀ + Ŝ₃ Ŝ₀). The exchange integral, J. was found to be equal to −0.60 cm⁻¹. This indicates a weak antiferromagnetic spin-exchange interactions beween the Cu(II) and the Gd(III) ions.