Synthesis, Characterization and Magnetic Studies of ž-Oxamido-Bridged Cu(II)-MN(II) Heterobinuclear Complexes

• Autorzy: Li Y. , Yan C. -W. , Yin X.-C.
• Języki publikacji: EN

Abstrakty

EN

Four new ž-oxamido-bridged copper(II)-manganese(II) heterobinuclear complexes described by the overall formula [Cu(dmoxpn)MnL2](ClO4)2, where dmoxpn denotes N,N_-bis[3-(dimethylamino)propyl)]oxamido dianion, L represents 2,2_-bipyridine (bpy); 4,4_-dimethyl-2,2_-bipyridine (Me2-bpy); 5-chloro-1,10-phenanthroline (Cl-phen) or 5-bromo-1,10-phenanthroline (Br-phen), have been synthesized and characterized. Based on elemental analyses, IR and electronic spectra studies and molar conductivity measurements, these complexes are proposed to have oxamido-bridged structures and to consist of the copper(II) ion in a planar environment and the manganese(II) ion in an octahedral environment. The electronic reflectance spectrum indicates the presence of exchange- coupling interaction between bridging copper(II) and manganese(II) ions. The [Cu(dmoxpn)Mn(bpy)2](ClO4)2 complex has been further characterized by variable temperature susceptibility (4.2-300 K) and the observed data were least-square fitted to the susceptibility equation derived from the spin Hamiltonian, _H = -2J _ S1_ S2, giving the exchange integral J = -27.8 cm-1. The results are commensurate with antiferromagnetic interaction between the adjacent manganese(II) and copper(II) ions through the oxamido-bridge within the complex. The influence of structural variation of the bridging ligand on magnetic interactions between the metal ions of this kind of complexes is also discussed.

Słowa kluczowe

EN

mi-oxamido-bridge; Cu(II)-Mn(II) heterobinuclear complexes; magnetism

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 1
• Strony: 13--21
• Opis fizyczny: Bibliogr. 18 poz., rys.

Twórcy

autor

Li Y.

• Department of Chemistry, Qufu Normal University, Qufu, Shandong, 273165, P. R. China

autor

Yan C. -W.

• Department of Chemistry, Qufu Normal University, Qufu, Shandong, 273165, P. R. China

autor

Yin X.-C.

• Department of Chemistry, Jining Teacher‘s College, Jining, Shandong, 272125, P. R. China

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