Single-molecule magnets (SMMs) are of considerable interest because of their ability to function as nanoscale magnets. They also display fascinating behavior which straddles the interface between the quantum and classical worlds of magnetism. It has recently been shown (Nguyen et al., J. Am Chem. Soc. 2011 , 133, 20688) that the [Mn3O(O2CMe)3(mpko)3](ClO4) (mpko = methyl-2-pyridyl ketone oximate) SMM with a triangular Mn3 topology and an S = 6 ground state spin can be used as a building block to synthesize a supramolecular tetramer if the oxime in its preparation is replaced with a dioxime. We have extended this work by using dicarboxylic acids capable of bridging two or more Mn3 units. Performing carboxylate substitution on [Mn3O(O2CMe)3(mpko)3](ClO4) with dicarboxylic acids, and taking advantage of the toluene:acetic acid azeotrope to help drive the substitution to completion, has yielded supramolecular aggregates of SMMs with different nuclearities and geometries.  The syntheses, structures and physical properties of these materials will be presented.

Supramolecular aggregates of single-molecule magnets by carboxylate substitution

247th National Meeting (2014)

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