科研之友
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摘要
The stable organic radical 2-(4,5,6,7-tetrafluorobenzimidazol-2-yl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl (F4BImNN) forms hydrogen-bonded chains in the solid state and exhibits one-dimensional ferromagnetic exchange with J/k(B) = 22 K. We use muon-spin rotation to demonstrate that weak interchain interactions drive the system to long-range magnetic order below T-c = 0.72 K. We use density-functional calculations of the muon site and compare our results to those obtained on the nonfluorinated analog compound. Our results show that F4BImNN is the best realization of a one-dimensional Heisenberg ferromagnet among purely organic compounds yet discovered.
- 出版日期2013-8-27
