Single-molecule magnets: Characterization of complexes exhibiting out-of-phase AC susceptibility signals

Hilary J. Eppley, Sheila M.J. Aubin, Michael W. Wemple, David M. Adams, Hui Lien Tsai, Vincent A. Grillo, Stephanie L. Castro, Ziming Sun, Kirsten Folting, John C. Huffman, David N. Hendrickson, George Christou

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The structures and characterization are described of complexes that exhibit an out-of-phase AC magnetic susceptibility Chim″. The dodecanuclear complexes [Mn12O12(O2CR)16(H 2O)4]2 contain 8MnIII,4MnIV or MnII,7MnIII, 4MnIV and possess ground state spins of S = 9 or 10 (z = O) or S = 19/2 (z = -1). The distorted-cubane complexes [Mn4O3X(O2CR)3(dbm)3] contain 3MnIII,MnIV and have been prepared with a variety of X groups; in every case, the ground state is S = 9/2. The anion [Mn11O10X6(O2CPh) 11(H2O)4]2- (9MnIII, 2MnIV; X = NCO-, N3-) contains two [Mn4O3X] distorted-cubanes linked by a [Mn3O4]+ unit; the ground state is S = 5. The cation [V4O2(O2CEt)7O)Py)2] + (4VIII) has a [V4O2]8+ butterfly core and a S = 3 ground state. All these complexes exhibit out-of-phase AC magnetic susceptibility signals at low temperatures (<8 K). These signals are indicative of slow relaxation of the magnetization, unable to keep in phase with the oscillating AC magnetic field, and are taken as evidence for single-molecule magnetism. The origin of the barrier to relaxation is discussed.

Original languageEnglish
Pages (from-to)167-179
Number of pages13
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Publication statusPublished - 1997 Jan 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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