Antiferromagnetically Coupled Chromium(III)-Chromium(III) Binuclear Complexes with Tris(oxalato)chromate(III)

• Autorzy: Li Y. , Lou J. , Yan C.
• Języki publikacji: EN

Abstrakty

EN

Three new binuclear chromium(III) complexes bridged by tris(oxalato)chromate(III), [Cr(ox)3]3- and end-capped with 2,2_-bipyridine (bpy); 4,4_-dimethyl-2,2_-bipyridine (Me2bpy) or 5-methyl-1,10-phenanthroline (Mephen), have been synthesized and characterized, namely [Cr2(ox)3(bpy)2] (1), [Cr2(ox)3(Me2bpy)2] (2) and [Cr2(ox)3(Mephen)2] (3). At present, the three complexes have not yet been isolated in crystalline form, suitable for X-ray structure analysis, but based on elemental analyses, molar conductance and magnetic moments of room-temperature measurements, and spectroscopic studies, extended ox-bridged structures consisting of two chromium(III) ions, each in an octahedral environment are proposed for these complexes. The complexes [Cr2(ox)3(bpy)2] (1) and [Cr2(ox)3(Me2bpy)2] (2) were further characterized by variable temperature magnetic susceptibility (4.2~300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H_ = 2JS_ ĹS_ 1 2, giving the exchange integrals J = -9.73 cm-1 for (1) and J = -5.29 cm-1 for (2). This result indicates the presence of weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule. The influence of the methyl substituents in the terminal ligand on magnetic interactions between the metals is also discussed.

Słowa kluczowe

EN

mi-oxalato-bridge; binuclear chromium(III) complexes; antiferromagnetic interaction; synthesis

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol. 78 / nr 6
• Strony: 761--769
• 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

Lou J.

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

autor

Yan C.

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

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