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The syntheses, crystal structures and magnetic properties are reported of two new and unusual mixed-valence Mn clusters [MnII4MnIVO(mpko)5(MeO-hmp)(mpko-hmp)(H2O)](ClO4)3 (1) and [MnII4MnIVO(ppko)5(MeO-hmp)(ppko-hmp)(H2O)](ClO4)3 (2). They were obtained from the reaction of mpkoH or ppkoH and hmpH with Mn(ClO4)2 in the presence of NaOMe, where mpkoH is methyl(pyridin-2-yl)ketone oxime, ppkoH is phenyl(pyridin-2-yl)ketone...
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