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, [Mn(2)(C(14)H(14)N(3)O(2))(2)(H(2)O)(4)](CF(3)O(3)S)(2)·H(2)O, (I), and bis{μ-3-[bis(pyridin-2-ylmethyl)amino]propionato}bis[aquamanganese(II)] bis(trifluoromethanesulfonate) dihydrate, [Mn(2)(C(15)H(16)N(3)O(2))(2)(H(2)O)(2)](CF(3)O(3)S)(2)·2H(2)O, (II), form binuclear seven-coordinate complexes. Oxidation of (II) with ammonium hexanitratocerate(IV), (NH(4))(2)[Ce(NO(3))(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)], [Mn(2)O(2)(C(15)H(16)N(3)O(2))(2)][Ce(NO(3))(4)(H(2)O)(3)](2), (III). The manganese complexes in (II) and (III) sit on a site of 1 symmetry.