Synthesis and Magnetic Characterization of mi-Oxamido-bridged Cu(II)-M(III) (M=Fe and Cr) Heterobinuclear Complexes

• Autorzy: Li Y. , Yan C. -W. , Guan H. -S.
• Języki publikacji: EN

Abstrakty

EN

Two new _-oxamido-bridged heterobinuclear complexes have been synthesized and identified as [Cu(dmoxae)Cr(Ph2phen)2](ClO4)3 (1) and [Cu(dmoxae)Fe(Ph2phen)2](ClO4)3 (2), where dmoxae denotes N,N_-bis[2-(dimethylamino)ethyl]oxamido dianion and Ph2phen represents 4,7-diphenyl-1,10-phenanthroline. Based on elemental analyses, IR, ESR and electronic spectra studies, and molar conductivity measurements, the complexes are proposed to have an extended oxamido-bridged structure consisting of planar copper(II) and octahedral chromium(III) or iron(III) ions. The two heterobinuclear complexes were further characterized by variable-temperature magnetic susceptibility (4.2~300 K) measurements and the magnetic data have been also 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 chromium(III) ions through the oxamido-bridge in complex (1) are ferromagnetically coupled with the exchange integral J(Cu-Cr) = +13.6 cm-1, while an intramolecular antiferromagnetic coupling is detected between the copper(II) and iron(III) ions through the oxamido-bridge in complex (2) with the exchange integral J(Cu-Fe) = -17.5 cm-1, on the basis of the spin Hamiltonian operator, _ _ _ H JS S Cu M = Ĺ 2 (M = Cr3+ and Fe3+). The influence of electronic-structural variation of the metal ions on the nature of spin-exchange interaction between the paramagnetic centers is also discussed.

Słowa kluczowe

EN

oxamido-bridge; copper(II); iron(III); chromium(III); heterobinuclear complexes; magnetic properties; synthesis

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2003
• Tom: Vol. 77 / nr 10
• Strony: 1235--1244
• Opis fizyczny: Bibliogr. 30 poz., rys.

Twórcy

autor

Li Y.

• Marine Drug & Food Institute, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, P. R. China

autor

Yan C. -W.

• College of Marine Life Sciences, Ocean University of China, Qingdao, 266003, P. R. China

autor

Guan H. -S.

• Marine Drug & Food Institute, Ocean University of China, 5 Yushan Road, Qingdao, Shandong, 266003, P. R. China

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