Dimeric and Tetrameric Supramolecular Aggregates of Single-Molecule Magnets via Carboxylate Substitution

[Mn3]2 and [Mn3]4 supramolecular aggregates of weakly exchange-coupled MnIII3 single-molecule magnets (SMMs) with S = 6 have been prepared by carboxylate substitution on [Mn3O­(O2CMe)3(mpko)3]+ [mpkoH = methyl­(pyridine-2-yl) ketone oxime)] with the dicarboxylic acids α-truxillic acid and fumaric acid, respectively. The method opens up a new approach to Mn3 SMM aggregates of various size and topology.