Abstract
Nine new μ-oxamido-bridged copper(II)–lanthanide(III) heterobinuclear complexes, described by the overall formula Cu(dmoxpn)Ln(NO2phen)2(NO3)3 (Ln=La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), where dmoxpn denotes N,N′-bis[3-(dimethylamino)propyl]oxamido dianions and NO2phen represents 5-nitro-1,10-phenanthroline, have been synthesized and characterized by the elemental analyses, molar conductivity measurements and spectroscopic (IR, UV, ESR) studies. The complex Cu(dmoxpn)Gd(NO2phen)2(NO3)3 was further characterized by variable-temperature magnetic susceptibility (4.2∼300K) measurements and the magnetic data have also been used to deduce the indicated heterobinuclear structure. The results derived from least-squares fit of the experimental data have confirmed that the adjacent copper(II) and gadolinium(III) ions through the oxamido-bridge in the complex are ferromagnetically coupled with the exchange integral J(Cu-Gd)=+7.8cm-1. A plausible mechanism for the ferromagnetic coupling between gadolinium(III) and copper(II) is discussed.
Published Version
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