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2 Polish Journal of Chemistry

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Synthesis and Magnetic Properties of mi-Oxalato-Bridged Cu(II)-Fe(III)-Cu(II) Heterotrinuclear Complexes

Wang H. D., Li Y. -T., Yan C. -W., Zeng X.-C.

Polish Journal of Chemistry

2002

Vol. 76 / nr 5

637-644

Three new _-oxalato-bridged copper(II)-iron(III)-copper(II) heterotrinuclear complexes described by the overall formula [Cu2Fe(ox)3L2]ClO4, where ox represents the oxalato dianions and L stands for 5-phenyl-1,10-phenanthroline (Ph-phen), 4,7-diphenyl- 1,10-phenanthroline (Ph2-phen) or 5-chloro-1,10-phenanthroline (Cl-phen), have been synthesized and characterized by elemental analyses, molar conductivity and magnetic moment (at room-temperature) measurements, IR and electronic spectral studies. It is proposed that these complexes have extended ox-bridged structures, consisting of two copper(II) and an iron(III) ions, in which the central iron(III) ion has an octahedral environment and the end capped two copper(II) ions have a square-planar environment. The variable-temperature susceptibilities of [Cu2Fe(ox)3(Ph-phen)2]ClO4 complex were measured and studied in the 4.2~300 K range. The least-squares fit of the experimental susceptibility based on the spin Hamiltonian operator, _ _ _ H = JS S 1 2 _ _ 2 , yielded J = -9.89 cm-1. The magnetic coupling parameter is consistent with an antiferromagnetic exchange interaction between the copper(II) and iron(III) ions through the oxalato-bridge in the complex.

Synthesis, Characterization and Magnetic Study of mi-Oxamido-Bridged Copper(II)–Lanthanide(III) Heterobinuclear Complexes

Li Y. T., Yan C. W., Wang H. D.

Polish Journal of Chemistry

2000

Vol. 74, nr 12

1655-1663

Ten new mi -oxamido-bridged copper(II)–lanthanide(III) heterobinuclear complexes described by the overall formula Cu(Br4obbz)Ln(phen)2NO3 (Ln = Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), where Br4obbz denotes the oxamido-N,N-bis(3,5-dibromobenzoato) and phen represents 1,10-phenanthroline, have been synthesized and characterized by the elemental analyses, magnetic moments (at room temperature), molar conductivity measurements and spectroscopic (IR, UV, ESR) studies. The temperature dependence of the magnetic susceptibility of Cu(Br4obbz)Gd(phen)2NO3 complex was measured over the range 4.2–300 K. The least-squares fit of the experimental susceptibilities based on the spin Hamiltonian operator,