A comparison between high-symmetry Mn12 single-molecule magnets in different ligand/solvent environments

摘要: Abstract We present angle-resolved high-frequency electron paramagnetic resonance (HFEPR) data collected for single-crystal samples of deuterated and undeuterated Mn12-acetate. The spectra reveal fine structures associated with the various Mn12 species corresponding to different local solvent environments proposed by Cornia et al. [A. Cornia, R. Sessoli, L. Sorace, D. Gatteschi, A.L. Barra, C. Daiguebonne, Phys. Rev. Lett. 89 (2002) 257201], recently confirmed Hill [S. Hill, R.S. Edwards, S.I. Jones, J.M. North, N.S. Dalal, 90 (2003) 217204] del Barco [E. Barco, A.D. Kent, E.M. Rumberger, D.N. Hendrickson, G. Christou, 91 047203]. Each exhibits a distinct dependence on applied field orientation, thereby highlighting discrete nature disorder. then compare these obtained two discovered high-symmetry (S4) analogs Mn12-Ac, differing only in their ligand structures. None highly reproducible fine-structures seen Mn12-Ac are found new complexes, thus confirming idea that structure significantly influences QMT dynamics Mn12-Ac. Indeed, HFEPR Mn12-BrAc Mn12-tBuAc provide spectacular resolution, allowing unique spectroscopic insights into giant spin SMMs.