Preparation and magnetic properties of nitroxide radical liquid crystalline physical gels
Preparation and magnetic properties of nitroxide radical liquid crystalline physical gels
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DOI：
10.1080/15421406.2017.1289611
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发表时间：
2017-04
影响因子：
0.7
通讯作者：
Yusa Takemoto;Y. Uchida;Satoshi Shimono;J. Yamauchi;R. Tamura
中科院分区：
文献类型：
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作者：
Yusa Takemoto;Y. Uchida;Satoshi Shimono;J. Yamauchi;R. Tamura
制备了由显示向列相的手性外消旋氮氧自由基化合物(±)-1和抗磁性、手性有机凝胶剂(R，R)-2组成的液晶物理凝胶，研究了凝胶剂对(±)-1向列相中观察到的“正磁-LC效应”的影响以及所得向列型凝胶中(±)-1的分子取向。随着胶凝剂用量的增加，分子在向列型凝胶相中受到磁场(0.34T)重定向的限制，有机胶凝剂分子自组装纤维形成的细小随机向列型多畴结构中的分子间磁相互作用(正磁-液晶效应)增强。
ABSTRACT Liquid crystalline physical gels which consist of a chiral racemic nitroxide radical compound (±)-1 showing a nematic phase and a diamagnetic, chiral organic gelator (R,R)-2 were prepared to investigate the effects of the gelator on the “positive magneto-LC effects” observed in the nematic phase of (±)-1 and the molecular alignment of (±)-1 in the resulting nematic gels. With the increasing amount of the gelator which decreased the domain size, the molecular reorientation by a magnetic field (0.34 T) was considerably restricted in the nematic gel phase and the intermolecular magnetic interactions (positive magneto-LC effects) increased in the fine and random nematic polydomain structure formed by self-assembled fibers of organic gelator molecules.