Anisotropic and Inhomogeneous Magnetic Interactions Observed in All-Organic Nitroxide Radical Liquid Crystals
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- 作者：Yoshiaki Uchida ; Katsuaki Suzuki ; Rui Tamura ; Naohiko Ikuma ; Satoshi Shimono ; Yohei Noda ; Jun Yamauchi
- 刊名：Journal of the American Chemical Society
- 出版年：2010
- 出版时间：July 21, 2010
- 年：2010
- 卷：132
- 期：28
- 页码：9746-9752
- 全文大小：435K
- 年卷期：v.132,no.28(July 21, 2010)
- ISSN：1520-5126
文摘
An anisotropic and inhomogeneous magnetic interaction (the average spin−spin interaction constant > 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.