New approach to the synthesis of polynuclear heterometallic pivalates with iron and manganese atoms

Resumo

New hexanuclear Fe(III)–Mn(II, III) pivalates [Fe₂^III Mn₄^II(O)₂(Piv)₁₀(HPiv)₄] (I) or [Fe₄^III Mn₂^III(O)₂(Piv)₁₂(CH₂O₂)(HPiv)₂] · Et₂O (II) are synthesized using the solid-state thermolysis of [Fe₂Mn(O)(Piv)₆(HPiv)₃] (90°С). Complexes I and II differ by the ratio of iron and manganese ions, which depends on the atmospheric composition during thermolysis. The structures of compounds I and II are determined by X-ray diffraction studies. According to the parameters of the Mössbauer spectrum, complex I contains the Fe³⁺ ions in the high-spin state in the octahedral environment of oxygen atoms.