TY - JOUR
T1 - A cyano-bridged FeIIReIV(CN)2 cluster incorporating two high-magnetic anisotropy building units
AU - Harris, T. David
AU - Soo, Han Sen
AU - Chang, Christopher J.
AU - Long, Jeffrey R.
N1 - Funding Information:
We thank the Packard foundation (C.J.C.), DOE/LBNL ( 403801 to C.J.C.), and the NSF ( CHE-0617063 to J.R.L.) for funding this work. C.J.C. is an Investigator with the Howard Hughes Medical Institute. We further thank Tyco Electronics for providing T.D.H. with a predoctoral fellowship, H. Harman for helpful discussions, and J. Zadrozny for experimental assistance. Appendix A
PY - 2011/4/15
Y1 - 2011/4/15
N2 - The pentagonal bipyramidal high-spin iron(II) complex, [(TPA 2C(O)NHtBu)Fe(CF3SO 3)]+, is shown to exhibit a high-anisotropy ground state, with fits to dc magnetization data providing an axial zero-field splitting parameter of D = - 7.9 cm-1. The utility of this compound as a building unit is demonstrated, as its reaction with [ReCl4(CN) 2]2- affords the cyano-bridged dinuclear cluster (TPA 2C(O)NHtBu)FeReCl4(CN)2. dc magnetic susceptibility measurements reveal intracluster ferromagnetic exchange interactions between FeII and ReIV centers, with J = +3.0 cm-1, giving rise to a spin ground state of S = 7/2. Moreover, fits to dc magnetization data obtained for the FeRe cluster show the presence of strong axial anisotropy, with D = -2.3 cm-1. Finally, variable-frequency ac susceptibility measurements reveal the onset of slow magnetic relaxation at low temperature, suggesting that the FeRe cluster is a single-molecule magnet.
AB - The pentagonal bipyramidal high-spin iron(II) complex, [(TPA 2C(O)NHtBu)Fe(CF3SO 3)]+, is shown to exhibit a high-anisotropy ground state, with fits to dc magnetization data providing an axial zero-field splitting parameter of D = - 7.9 cm-1. The utility of this compound as a building unit is demonstrated, as its reaction with [ReCl4(CN) 2]2- affords the cyano-bridged dinuclear cluster (TPA 2C(O)NHtBu)FeReCl4(CN)2. dc magnetic susceptibility measurements reveal intracluster ferromagnetic exchange interactions between FeII and ReIV centers, with J = +3.0 cm-1, giving rise to a spin ground state of S = 7/2. Moreover, fits to dc magnetization data obtained for the FeRe cluster show the presence of strong axial anisotropy, with D = -2.3 cm-1. Finally, variable-frequency ac susceptibility measurements reveal the onset of slow magnetic relaxation at low temperature, suggesting that the FeRe cluster is a single-molecule magnet.
KW - Cyanide
KW - High-spin iron(II)
KW - Magnetic anisotropy
KW - Single-molecule magnet
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U2 - 10.1016/j.ica.2010.12.010
DO - 10.1016/j.ica.2010.12.010
M3 - Article
AN - SCOPUS:79953841927
SN - 0020-1693
VL - 369
SP - 91
EP - 96
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1
ER -