Synthesis, characterization and Magnetic Studies of Oxamido-Bridged Copper(II)-Iron(III) Heterobinuclear Complexes
In: Polish Journal of Chemistry
Online
serialPeriodical
Zugriff:
Two new oxamido-bridged Cu(II)-Fe(III) heterobinuclear complexes of formulae [Cu(dmoxpn)Fe(bpy)2](ClO4)3 (1) and [Cu(dmoxae)Fe(bpy)2](ClO4)3 (2) have been synthesized, where bpy denotes 2,2_-bipyridine; while dmoxpn and dmoxae represent N,N_-bis[3-(dimethylamino)propyl]oxamido and N,N_-bis[2-(dimethylamino) ethyl]oxamido dianions, respectively. Based on elemental analyses, molar conductivity measurements, IR and electronic spectral studies, it is proposed that the two complexes have oxamido-bridged structures consisting of a copper(II) and an iron(III) ions, which have a square planar environment and a distorted octahedral environment, respectively. The two heterobinuclear complexes were further characterized by variable-temperature magnetic susceptibility (4.2~300 K) measurements and the observed data were simulated by the equation based on the spin Hamiltonian operator, H = JS S 1 2 2 , giving the exchange integral J = -18.2 cm-1 for (1) and J = -26.5 cm-1 for (2). The results revealed the occurrence of an intramolecular antiferromagnetic interaction between the adjacent iron(III) and copper(II) ions through the oxamido- -bridge within each molecule. The influence of the chelate ring arrangement around the copper( II) in the copper(II)-iron(III) heterobinuclear complexes on magnetic interactions between the metal ions of this kind of complexes is preliminarily discussed.
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Synthesis, characterization and Magnetic Studies of Oxamido-Bridged Copper(II)-Iron(III) Heterobinuclear Complexes
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Autor/in / Beteiligte Person: | Li, Y. ; Zhu, C. ; Yan, C. ; Dou, J. ; Wang, D. |
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Zeitschrift: | Polish Journal of Chemistry |
Medientyp: | serialPeriodical |
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