Abstract
Some newly found properties of the single-molecule magnets Mn12–acetate and Fe8Br8 are summarized: they are semiconductors and their 20 unpaired (S=10) electrons are delocalized not only on the metal ions, but also quite significantly (several percent) on the organic linkers (ligands). Fe8Br8 has an S=9 excited state located at about 24 K (17 cm−1) above the S=10 ground state. The zero-field (D and E) parameters of the S=9 state differ from those of the S=10 state by 7%–8%. The band gap for Mn12–acetate was found to be 0.37 eV, while that for Fe8Br8 was 0.73 eV. Details of the experimental techniques used (EPR, NMR, isotope-labeling, four-point conductivity) are provided, together with the discussions of the results in the context of other experimental techniques, and theoretical calculations.
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