Anisotropic and inhomogeneous magnetic interactions observed in all-organic nitroxide radical liquid crystals.
Anisotropic and inhomogeneous magnetic interactions observed in all-organic nitroxide radical liquid crystals.
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在全有机硝基氧自由基液晶中观察到的各向异性和不均匀的磁相互作用。
DOI：
10.1021/ja101930d
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发表时间：
2010
影响因子：
15
通讯作者：
J. Yamauchi
中科院分区：
文献类型：
--
作者：
Y. Uchida;Katsuaki Suzuki;R. Tamura;Naohiko Ikuma;Satoshi Shimono;Y. Noda;J. Yamauchi
在外消旋和非外消旋全有机自由基化合物1a和1b的不同液晶相中观察到各向异性和不均匀的磁相互作用(平均自旋-自旋相互作用常数(-)J>；0)。通过VT-EPR谱，我们从自旋-自旋偶极子相互作用和交换相互作用两个方面讨论了LC超结构是如何在LC相中诱导磁相互作用的。磁相互作用的大小取决于LC相的类型或超结构。此外，漂浮在水面上的自由基液滴通常被永磁体吸引并在该永磁体的影响下自由移动，而相同化合物的结晶粒子从未对该磁体做出反应。液滴对磁体的响应也取决于LC相的类型，即磁相互作用的程度。
An anisotropic and inhomogeneous magnetic interaction (the average spin-spin interaction constant (-)J > 0) was observed in the various liquid crystalline (LC) phases of racemic and nonracemic all-organic radical LC compounds 1a and 1b. We discussed how the LC superstructures induced the magnetic interaction to operate in the LC phases in terms of spin-spin dipole and exchange interactions by means of VT-EPR spectroscopy. The magnitude of the magnetic interaction depended on the type of LC phase, or the superstructure. Furthermore, these radical LC droplets floating on water were commonly attracted to a permanent magnet and moved freely under the influence of this magnet, whereas the crystallized particles of the same compounds never responded to the magnet. The response of the LC droplets to the magnet also varied depending on the type of LC phase, that is, the extent of the magnetic interaction.