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1 Polish Journal of Chemistry

1 2001

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Synthesis and Magnetism of mi-Oxamido-bridged Cu2 II Ln III -type Heterotrinuclear Complexes (Ln=Ce, Nd, Sm, Eu, Gd, Tb, Dy, Er)

Li Y., Yan C. W.

Polish Journal of Chemistry

2001

Vol. 75, nr 3

355-362

Eight new Cu2 IILnIII-type (Ln = Ce, Nd, Sm, Eu, Gd, Tb, Dy, Er) heterotrinuclear complexes bridged by N,N_-bis(2-aminopropyl)oxamidocopper(II) [Cu(oxdn)], namely Cu2(oxdn)2Ln(NO3)3, have been synthesized and characterized by elemental analyses, molar conductivity measurements and spectroscopic (IR, UV, ESR) studies. Magnetic susceptibility measurements (4.2~300 K) and studies of Cu2(oxdn)2Gd(NO3)3 complex have revealed that the central gadolinium(III) and terminal copper(II) ions are ferromagnetically coupled with the exchange integral J(Cu-Gd) = +2.98 cm-1, while an antiferromagnetic coupling is detected between the terminal copper(II) metal ions with the exchange integral J(Cu Cu) ' _ = _0.75 cm-1, on the basis of the spin Hamiltonian operator [H 2J(S S S S ) 2J'(S S Cu1 Gd Cu2 Gd Cu1 Cu2