Synthesis and characterization of a new dinuclear bis(μ-oxo)manganese(III)/manganese(IV) complex

[(pmap)Mn-(μ-O)2-Mn(pmap)](ClO4)3, a dinuclear bis(μ-oxo)manganese (III, IV) complex, was synthesized by the reaction of Mn(ClO4)2 with bis[2-(2-pyridyl)ethyl]-2-pyridylmethylamine (=pmap) and hydrogen peroxide. The complex was characterized structurally and EPR-measurements showed the characteristic 16 line signal for a bis-(μ-oxo)Mn(III)/Mn(IV) dimer. The corresponding complex with tris[2-(2-pyridyl)ethyl]amine (=tepa) could not be synthesized; it is most likely that in this complex, the MnMn separation would be too long for a bis(μ-oxo) bridge.