title: New valence-sandwich [Mn(II)4Mn(III)4Mn(II)4] aggregate showing single-molecule magnet behavior.
abstract: The reaction of manganese(II) acetate, 1,1,1-tris(hydroxymethyl)methane (H3thme), and triethylamine in methanol leads to the formation of [Mn12O2(OMe)2(thme)4(OAc)10(H2O)4].2MeOH. The [Mn(III)4Mn(II)8] core consists of a central [Mn(III)4O6] rhombus sandwiched by two [Mn(II)4O7] fragments. Frequency-dependent ac susceptibility and hysteresis loops in the magnetization indicate single-molecule magnet behavior with a pure quantum-tunneling regime of relaxation below 0.2 K.
authors.affiliation: Institut für Anorganische Chemie, Universität Karlsruhe, Engessserstrasse Geb. 30.45, D-76128 Karlsruhe, Germany.
authors.forename: Yangguang
authors.initials: Y
authors.lastname: Li
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wernsdorfer
authors.forename: Rodolphe
authors.initials: R
authors.lastname: Clérac
authors.forename: Ian J
authors.initials: IJ
authors.lastname: Hewitt
authors.forename: Christopher E
authors.initials: CE
authors.lastname: Anson
authors.forename: Annie K
authors.initials: AK
authors.lastname: Powell