Dimeric and tetrameric supramolecular aggregates of single-molecule magnets via carboxylate substitution.

[Mn3]2 and [Mn3]4 supramolecular aggregates of weakly exchange-coupled Mn(III)3 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.