A spectroscopic comparison between several high-symmetry S = 10 Mn 12 single-molecule magnets

We report angle-dependent high-field electron-paramagnetic-resonance data collected for single-crystal samples of Mn 12 - Ac . The spectra reveal fine structures associated with various Mn 12 species corresponding to different disordered local environments. Each of the fine structures exhibits a distinct dependence on the field orientation, thereby highlighting the discrete nature of the disorder. We compare these data with the spectra obtained for two recently discovered analogs of Mn 12 - Ac , differing only in their ligand and solvent molecules. None of the fine structures seen for Mn 12 - Ac are found for the recently discovered Mn 12 complexes, thus confirming that the solvent significantly influences the magnetization dynamics in Mn 12 - Ac .