期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 134, 期 17, 页码 7521-7529出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja301338d
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资金
- Department of Energy/Lawrence Berkeley National Laboratory [403801]
- National Science Foundation (NSF) [CHE-1111900, DMR-0804408, DMR-0654118]
- State of Florida
- Tyco Electronics
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1111900] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [804408] Funding Source: National Science Foundation
The model compounds (NBu4)(2)[ReCl4(CN)(2)] (1), (DMF)(4)ZnReCl4(CN)(2) (2), and [(PY5Me2)(2)Mn2ReCl4(CN)(2)](PF6)(2) (3) have been synthesized to probe the origin of the magnetic anisotropy barrier in the one-dimensional coordination solid (DMF)(4)MnReCl4(CN)(2) (4). High-field electron paramagnetic resonance spectroscopy reveals the presence of an easy-plane anisotropy (D > 0) with a significant transverse component, E, in compounds 1-3. These findings indicate that the onset of one-dimensional spin correlations within the chain compound 4 leads to a suppression of quantum tunneling of the magnetization within the easy plane, resulting in magnetic bistability and slow relaxation behavior. Within this picture, it is the transverse E term associated with the Re-IV centers that determines the easy axis and the anisotropy energy scale associated with the relaxation barrier. The results demonstrate for the first time that slow magnetic relaxation can be achieved through optimization of the transverse anisotropy associated with magnetic ions that possess easy-plane anisotropy, thus providing a new direction in the design of single-molecule and single-chain magnets.
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