Distorted Mn(IV)Mn(III)3 cubane complexes as single-molecule magnets

Sheila M.J. Aubin, Michael W. Wemple, David M. Adams, Hui-Lien Tsai, George Christou, David N. Hendrickson

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Alternating current (ac) magnetic susceptibility data are presented for six distorted cubane complexes of the composition [Mn(IV)Mn(III)3O3X]. Each of these complexes has a well isolated S = 9/2 ground state. There is zero-field splitting (ZFS) in the ground states where D, the axial ZFS parameter, is found to be in the range of -0.27 to -0.38 cm-1. As a result of the big spin ground state and appreciable magnetic anisotropy, an out-of-phase ac magnetic susceptibility signal is seen for each of the six Mn4 complexes. The out-of-phase ac susceptibility signal reflects slow magnetization relaxation which is taken to indicate that individual molecules are acting as magnets. Alternating current susceptibility data are presented for a frozen glass of one of the Mn4 complexes to confirm that the out-of-phase ac signal is associated with isolated molecules. The factors that influence whether a given complex can function as a single-molecule magnet are described. The above Mn4 complexes represent only the second type of molecules that exhibit enough magnetic anisotropy to function as single-molecule magnets.

Original languageEnglish
Pages (from-to)7746-7754
Number of pages9
JournalJournal of the American Chemical Society
Issue number33
Publication statusPublished - 1996 Aug 21

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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