Oxidative Cleavage of Triethylenetetramine (trien) to Yield Diethylenetriamine (dien): Structure of the Mn II /Mn III Heptanuclear Complex [Mn7(trien)2(dien)2O4(OAc)8](PF6)4·2H2O

Two [Mn4(μ3-O)2] moieties with butterfly structure, which are coupled via a common Mn atom, are present in the cation of the title compound (structure with coordinated N () and O atoms () shown below). The complex cation, which contains six MnIII centers and one MnII center, is formed in the reaction of manganese(II) acetate and triethylenetetramine in methanol. During the reaction a part of the tetramine ligand is cleaved oxidatively with formation of diethylenetriamine.