Magnetic Bistability in Mononuclear Iron(II) Pyrrolide Complexes and Cyano-bridged Chain Compounds
This presentation will describe our efforts to engender high magnetic relaxation barriers in low-dimensional coordination compounds. First, strong magnetic anisotropy in a family of iron(II) pyrrolide complexes is shown to give rise to the first examples of transition metal-based mononuclear single-molecule magnets. The anisotropy and relaxation dynamics of these complexes are examined through an array of magnetic and spectroscopic measurements. Next, a building block approach is employed to install strong coupling in cyano-bridged chain compounds. In particular, simple molecular orbital considerations are used to design and construct the compound (Bu4N)[TpCuReCl4(CN)2], which demonstrates the strongest ferromagnetic coupling ever observed through cyanide. Finally, this approach is extended toward the assembly of a series of single-chain magnets, (DMF)4MReCl4(CN)2 (M = Mn, Fe, Co, Ni). Most notably here, the field-dependent magnetization of the iron analogue exhibits significant hysteresis at low temperature, thus demonstrating classical magnet behavior in a one-dimensional solid.
T. D. Harris and D. E. Freedman and W. H. Harman and M. V. Bennett and C. Coulon and H. Fong and A. Chang and J. D. Rinehart and A. Ozarowski and M. T. Sougrati and F. Grandjean and G. J. Long and R. Clérac and C. J. Chang and J. R. Long, "Magnetic Bistability in Mononuclear Iron(II) Pyrrolide Complexes and Cyano-bridged Chain Compounds," Proceedings of the 242nd National Meeting of the American-Chemical-Society (ACS), American Chemical Society (ACS), Aug 2011.
242nd National Meeting of the American-Chemical-Society (ACS) (2011: Aug. 28 - Sep. 1, Denver, Colorado)
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