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Binuclear iron(III) complexes bridged by terephthalato groups

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Abstract

Six new μ-terephthalato iron(III) binuclear complexes have been prepared and identified: [Fe2(TPHA)(L)4]-(ClO4)4 [L = 2,2′-bipyridine (bpy); 1,10-phenanthroline (phen); 4,4′-dimethyl-2,2′-bipyridine (Me2bpy); 5-methyl-1,10-phenanthroline (Me-phen); 5-chloro-1,10-phenanthroline (Cl-phen) and 5-nitro-1,10-phenanthroline (NO2-phen)]; where TPHA = the terephthalate dianion. Based on the elemental analyses, molar conductance and magnetic moments of room-temperature measurements, and spectroscopic studies, extended TPHA-bridged structures consisting of two iron(III) ions, each in an octahedral environment, are proposed for these complexes. The [Fe2(TPHA)(Me-phen)4](ClO4)4 (1) and [Fe2(TPHA)(phen)4](ClO4)4 (2) complexes were characterized by variable temperature magnetic susceptibility (4–300 K) measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, Ĥ = −2JŜ 1 Ŝ 2, giving the exchange integrals J = −1.05 cm−1 for (1) and J = −9.28 cm−1 for (2). This result indicates the presence of a weak antiferromagnetic spin-exchange interaction between the metal ions within each molecule. The influence of the terminal ligand methyl substituents on magnetic interactions between the metals is also discussed.

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Authors and Affiliations

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

    Yan-Tuan Li

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

    Cui-Wei Yan & Yuan-Fang Lu

  3. Department of Chemistry, Nankai University, Tianjin, 300071, P.R. China

    Dai-Zheng Liao

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  1. Yan-Tuan Li
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Li, YT., Yan, CW., Lu, YF. et al. Binuclear iron(III) complexes bridged by terephthalato groups. Transition Metal Chemistry 23, 237–240 (1998). https://doi.org/10.1023/A:1015775809249

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