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Structurally, the two mixed-valence manganese disks Mn₇-11 and Mn₇-16 differ only in the peripheral ligand but, as a result of a subtle interplay of intramolecular exchange interactions, differ strongly in their magnetic properties, e.g., Mn₇-11 possesses a ground-state spin of $S=11$ and Mn₇-16 of $S=16$. The exchange interactions in the disks were studied by inelastic neutron scattering. The analysis of the Q dependence of the observed magnetic transition intensities reveals that ferromagnetic cluster spin-wave excitations were observed. In this framework, it was possible to successfully model the experimental data and provide a physical understanding of the magnetism in the two disks.
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Nehrkorn et al. (2012) studied this question.
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