Synthesis, Characterization and magnetic Properties of mi-2-Nitroterephthalato Binuclear Iron(II) Complexes

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

Abstrakty

EN

Four new binuclear iron(II) complexes bridged by 2-nitroterephthalato groups (NTPHA) and ended with 4,4_-dimethyl-2,2_-bipyridine (Me2-bpy), 2,9-dimethyl-1,10-phenanthroline (Me2-phen), 5-chloro-1,10-phenanthroline (Cl-phen) or 5-bromo-1,10-phenanthroline (Br-phen), namely [Fe2(NTPHA)L4](ClO4)2 (L=Me2-bpy,Me2-phen, Cl-phen, Br-phen), have been synthesized and characterized. Based on elemental analyses, magnetic moments (at room temperature), molar conductance measurements, and spectroscopic studies, extended NTPHA-bridged structures consisting of two iron(II) ions, each in a distorted octahedral environment are proposed for these complexes. The variable temperature magnetic susceptibilities of complexes [Fe2(NTPHA)(Me2-bpy)4](ClO4)2 (1) and [Fe2(NTPHA)(Me2-phen)4](ClO4)2 (2) were measured over the range 4.2~300 K and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, _ _ _ H JS S _ _ _ 2 1 2, giving the exchange integrals J = -1.02 cm-1 for (1) and J = -1.96 cm-1 for (2). These results indicate the presence of a very weakly antiferromagnetic spin-exchange interaction between the iron(II) ions within each molecule. The influence of nitro substituent in the bridging ligand on magnetic interaction between the metal ions of this kind of complexes is also discussed.

Słowa kluczowe

EN

2-nitroterephthalato-bridge; binuclear iron(II) complexes; magnetism; synthesis

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 6
• Strony: 765--771
• Opis fizyczny: Bibliogr. 20 poz., rys.

Twórcy

autor

Li Y.

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

autor

Yan C. -W.

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

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