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https://doi.org/10.1002/chem.201501866
Title: | Tuning the Magnetic Interactions and Relaxation Dynamics of Dy-2 Single-Molecule Magnets | Authors: | Xue, Shufang Guo, Yun-Nan Ungur, Liviu Tang, Jinkui Chibotaru, Liviu F |
Keywords: | Science & Technology Physical Sciences Chemistry, Multidisciplinary Chemistry dysprosium ab initio calculations magnetic properties N,O ligands single-molecule magnets ION MAGNET LANTHANIDE COMPLEXES ANISOTROPY BARRIER GROUND-STATE BLOCKING BEHAVIOR TRIANGLES SYMMETRY EXCHANGE SYSTEMS |
Issue Date: | 28-Sep-2015 | Publisher: | WILEY-V C H VERLAG GMBH | Citation: | Xue, Shufang, Guo, Yun-Nan, Ungur, Liviu, Tang, Jinkui, Chibotaru, Liviu F (2015-09-28). Tuning the Magnetic Interactions and Relaxation Dynamics of Dy-2 Single-Molecule Magnets. CHEMISTRY-A EUROPEAN JOURNAL 21 (40) : 14099-14106. ScholarBank@NUS Repository. https://doi.org/10.1002/chem.201501866 | Abstract: | Efficient modulation of single-molecule magnet (SMM) behavior was realized by deliberate structural modification of the Dy2 cores of [Dy2(a′povh)2(OAc)2(DMF)2] (1) and [Zn2Dy2(a′povh)2(OAc)6]•4 H2O (2; H2a′povh=N′-[amino(pyrimidin-2-yl)methylene]-o-vanilloyl hydrazine). Compound 1 having fourfold linkage between the two dysprosium ions shows high-performance SMM behavior with a thermal energy barrier of 322.1 K, whereas only slow relaxation is observed for compound 2 with only twofold connection between the dysprosium ions. This remarkable discrepancy is mainly because of strong axiality in 1 due to one pronounced covalent bond, as revealed by experimental and theoretical investigations. The significant antiferromagnetic interaction derived from bis(μ2-O) and two acetate bridging groups was found to be crucial in leading to a nonmagnetic ground state in 1, by suppressing zero-field quantum tunneling of magnetization. | Source Title: | CHEMISTRY-A EUROPEAN JOURNAL | URI: | https://scholarbank.nus.edu.sg/handle/10635/228723 | ISSN: | 0947-6539 1521-3765 |
DOI: | 10.1002/chem.201501866 |
Appears in Collections: | Staff Publications Elements |
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