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A cyano-bridged FeRe(CN)2 cluster incorporating two high-magnetic anisotropy building units |
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| Authors: | T David Harris Christopher J Chang Jeffrey R Long |
| Institution: | a Department of Chemistry, University of California, Berkeley, CA 94720, United States b Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, United States c Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States |
| Abstract: | The pentagonal bipyramidal high-spin iron(II) complex, (TPA2C(O)NHtBu)Fe(CF3SO3)]+, 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 (TPA2C(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. |
| Keywords: | Cyanide Magnetic anisotropy Single-molecule magnet High-spin iron(II) |
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