Tetranuclear manganese(III) clusters containing both carboxylate and phosphonate bridging ligands

Abstract

This paper reports two tetranuclear manganese clusters, namely, [Mn 4O 2(O 2CCH 3) 4(O 3PC 6H 11) 2(phen) 2] ( 1) and [Mn 4O 2(O 2CPh) 4 (O 3PC 6H 11) 2(bpy) 2] ( 2). Both contain a butterfly-like [Mn 4(μ 3-O) 2] 8+ core. The neighboring Mn atoms within the core are bridged by the carboxylate groups, forming approximately a plane. The phosphonate ligands locate above and below the plane, and cap on top of the Mn 3O triangles by using its three phosphonate oxygen atoms. The magnetic measurements of complexes 1 and 2 reveal that dominant antiferromagnetic interactions are propagated between the magnetic centers.