Oxidation of a dinuclear manganese(II) complex to an oxide-bridged dimanganese(IV) complex

Bis{μ-2-[bis­(pyridin-2-ylmeth­yl)amino]­acetato}­bis­[diaqua­man­ganese(II)] bis­(trifluoro­methanesulfonate) monohydrate, [Mn₂(C₁₄H₁₄N₃O₂)₂(H₂O)₄](CF₃O₃S)₂·H₂O, (I), and bis­{μ-3-[bis­(pyridin-2-ylmeth­yl)amino]­propionato}bis­[aqua­mangan­ese(II)] bis­(trifluoro­methanesulfonate) dihydrate, [Mn₂(C₁₅H₁₆N₃O₂)₂(H₂O)₂](CF₃O₃S)₂·2H₂O, (II), form binuclear seven-coordinate complexes. Oxidation of (II) with ammonium hexa­nitratocerate(IV), (NH₄)₂[Ce(NO₃)₆], gave the oxide-bridged dimanganese(IV) complex di-μ-oxido-bis­(bis­{3-[bis­(pyridin-2-ylmeth­yl)amino]­propionato}manganese(IV)) bis­[triaqua­tetra­nitratocerate(IV)], [Mn₂O₂(C₁₅H₁₆N₃O₂)₂][Ce(NO₃)₄(H₂O)₃]₂, (III). The manganese complexes in (II) and (III) sit on a site of symmetry.