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Reprint of “A cyanido-bridged trinuclear {FeIII2NiII} complex decorated with organic radicals” ☆
Polyhedron (2013)
  • Yuan-Zhu Zhang, University of Missouri–St. Louis
  • Dong-Feng Li, Central China Normal University
  • Rodolphe Clérac, Centre national de la recherche scientifique
  • Stephen M. Holmes, University of Missouri–St. Louis
Abstract
Reaction of [NEt4][(pzTp)FeIII(CN)3], nickel(II) trifluoromethanesulfonate and 4,4,5,5-tetramethylimidazoline-1-oxyl-2-(2′-pyridyl) (IM-2Py) affords {[(pzTp)FeIII(CN)3]2NiII(IM-2Py)2}·2DMF·H2O·0.5Et2O (1) as a bent cyanide-bridged trinuclear complex. As judged from simulations of the magnetic data, the magnetic exchange between the {FeIII2NiII} (S = 2) and both IM-2Py (S = ½) radical ligands are negligible, or in other words, each radical imparts a Curie contribution to the overall paramagnetism of the complex; the best set of parameters are giso = 2.53(5), grad = 2 (fixed), and Jiso/kB = 3.9(1) K. ac susceptibility and M versus H data show that 1 does not exhibit slow relaxation of the magnetization above 1.8 K. Consistent with the magnetic data, we conclude that bent cyanide bridges, an improper alignment of the FeIIILS anisotropy tensors, and/or small IM-2Py ring distortions conspire to bring insufficient magnetic anisotropy to the complex, and prevent observation of single-molecule magnet behavior.
Disciplines
Publication Date
January 11, 2013
DOI
10.1016/j.poly.2013.06.009
Citation Information
Yuan-Zhu Zhang, Dong-Feng Li, Rodolphe Clérac and Stephen M. Holmes. "Reprint of “A cyanido-bridged trinuclear {FeIII2NiII} complex decorated with organic radicals” ☆" Polyhedron Vol. 64 (2013) p. 393 - 398
Available at: http://works.bepress.com/stephen-holmes/7/