Crystal structures and magnetism of binuclear iron(III) complexes with a linear oxo-bridge, [Fe2O(bbimae)2X2][NO3]2 {bbimae =2-[bis(benzimidazol-2-ylmethyl)amino]ethanol, X = Cl or NCS}

Kazuhiro Takahashi, Yuzo Nishida, Yonezo Maeda, Sigeo Kida

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27 Citations (Scopus)

Abstract

The crystal structures of the oxo-bridged binuclear iron(III) complexes [Fe2O(bbimae)2X2] [NO3]2 {X = Cl (1) or NCS (2); bbimae = 2-[bis(benzimidazol-2-ylmethyl)amino]ethanol} have been determined by X-ray diffraction methods. Crystals of (1) are monoclinic with a = 11.949(3), b = 15.901(4), c = 11.326(2) Å, β =109.36(2)°, space group P21/n, and Z = 2. Crystals of (2) are orthorhombic with a = 16.384(2), b = 19.804(2), c = 13.600(2) Å, space group Pbca, and Z = 4. Both crystals are composed of centrosymmetric dimeric cations with a linear Fe-O-Fe bond and nitrate counter ions. The iron-iron and iron-oxo distances are 3.563(1) and 1.7816(7) Å for (1) and 3.559(1) and 1.7795(8) Å for (2). Mössbauer spectra reveal the presence of high-spin iron(III) atoms in both complexes. The magnetic moments of 1.81(295 K) and 0.73 B.M. (98 K) for (1) and 1.82 (295 K) and 0.89 B.M. (98 K) for (2) indicate an antiferromagnetic interaction between the two iron(III) atoms. The -J value was evaluated as 103 cm-1 for (1), which falls in the range (95-110 cm-1) of previously reported oxo-bridged complexes with Fe-O-Fe bond angles in the range 139-180°.

Original languageEnglish
Pages (from-to)2375-2380
Number of pages6
JournalJournal of the Chemical Society, Dalton Transactions
Issue number11
DOIs
Publication statusPublished - Dec 1 1985

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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