Synthesis of m mm m-Oxo and Bis( m mm m-alkoxo) Bridged Diiron(III) Complexes Using a Tripodal Ligand, Bis(2-benzimidazolylmethy)ethanolamine with Mixed N/O Donor Atoms

摘要

A μ-oxo diiron(III) complex and two bis( μ-alkoxo) diiron(III) complexes with biomimetic tripodal ligand con-taining mixed N/O donor atoms were synthesized using a mononuclear iron(III) complex as starting material. Depending on the amounts and kinds of bases used, we obtained various kinds of diiron (III) complexes. The reaction of [Fe III (Hbbea)Cl2]Cl, 1, with an equivalent amount of KO2 or NaOAc produced [Fe III 2O(Hb-bea) 2Cl2]Cl2, 2. An additional equivalent amount of NaOBz or NaOAc converts complex 2 to complex 3 or complex 4 depending on the base used. The addition of two equivalent amounts of NaOBz orNaOAc directly converts complex 1 to [Fe III 2(bbea)2(OBz)2]Cl2, 3, or [Fe III 2(bbea)2(OAc)2]Cl2, 4, depending on the base used. Crystal data are as follows: [Fe III 2O(Hbbea)2Cl2]Cl2, 2: monoclinic space group P21, a = 8.421 (1) ?, b = 18.416 (2) ?, c = 13.736 (1) ?, β = 104.870 (7)°, V = 2058.9 (4) ? 3 , Z = 2, R1 = 0.0469 and wR2 = 0.1201 for reflections with I > 2 б(I).