Molecuoar Mobility Effect on Magnetic Interactions in All-Organic Paramagnetic Liquid Crystal with Nitroxide Radical as a Hydrogen-Bonding Acceptor.
Molecuoar Mobility Effect on Magnetic Interactions in All-Organic Paramagnetic Liquid Crystal with Nitroxide Radical as a Hydrogen-Bonding Acceptor.
复制标题
以氮氧自由基作为氢键受体的全有机顺磁液晶中分子迁移率对磁相互作用的影响。
DOI：
10.1021/acs.jpcb.8b03839
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
N.
中科院分区：
文献类型：
--
作者：
Nakagami;S.;Akita;T.;Kiyohara;D.;Uchida;Y.;Tamura;R.;Nishiyama;N.
我们合成了具有硝基氧（NO）和羟基（OH）的新型手性全有机液晶（LC）化合物，这些化合物在NO和OH基团之间形成分子间氢键。液晶化合物在室温下呈现六方柱状相，在低温下固化为液晶玻璃。每种化合物在液晶相和各向同性相下的实验磁化率均大于基于自旋量简单假设的理论估计值，而在液晶玻璃态下则与理论值一致。这称为磁液晶效应。随着温度升高，通过液晶玻璃态到液晶相变，实验磁化率与理论磁化率之间的差异逐渐增大。这表明分子迁移率是磁液晶效应的起源之一。
We synthesized new chiral all-organic liquid crystalline (LC) compounds with nitroxide (NO) and hydroxy (OH) groups, which form intermolecular hydrogen bonds between the NO and OH groups. The LC compounds show hexagonal columnar phases at room temperature, which solidify as LC glasses at low temperature. The experimental magnetic susceptibility of each of the compounds in the LC and isotropic phases is larger than that theoretically estimated on the simple assumption about the amount of the spins, whereas it accords with the theoretical one in the LC glass state. It is called magneto-LC effects. The difference between experimental and theoretical magnetic susceptibilities gradually increases as temperature increases through the LC glass state-to-LC phase transition. It suggests that molecular mobility is one of the origins of the magneto-LC effects.