Synthesis, characterization and magnetic properties of mono-and dinuclear complexes of Manganese (III) and (IV) supported by (E)-N'-( 1-(thiophene-2-yl)ethylidene)benzohydrazide arising from an unusual Mn(III) to Mn(IV) disproportionation reaction

摘要

A new Mn~(IV) dinuclear complex [Mn~(IV)-2(μ-O)2(L')4].2CH3OH (HL' = (E)-N'-(l-(thiophen-2-yI)ethylidene)benzo-hydrazide) was obtained from Mn~(III)(acetate)3.2H2O by an unusual Mn(III) disproportionation reaction. This compound exhibits a strong antiferromagnetic coupling with a J value of —149(5) cm~(-1). Moreover, a new Mn(III) mononuclear complex bearing V named [Mn(III)(acac)(L')2] (acac = acetylacetonate) was obtained from [Mn~(III)(acac)3] and is described as a part of a systematic research work around manganese complexes of magnetic interest.