Switching of Ionic Conductivities in Columnar Liquid-Crystalline Anilinium Salts: Effects of Alkyl Chains, Ammonium Cations and Counter Anions on Thermal Properties and Switching Temperatures
Switching of Ionic Conductivities in Columnar Liquid-Crystalline Anilinium Salts: Effects of Alkyl Chains, Ammonium Cations and Counter Anions on Thermal Properties and Switching Temperatures
复制标题
柱状液晶苯胺盐中离子电导率的转换：烷基链、铵阳离子和抗衡阴离子对热性能和转换温度的影响
DOI：
10.1039/c8me00099a
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发表时间：
2019
影响因子：
3.6
通讯作者：
Takashi Kato
中科院分区：
文献类型：
--
作者：
Daniel Kuo;Bartolome Soberats;K. R. S. Kumar;Masafumi Yoshio;Takahiro Ichikawa;Hiroyuki Ohno;Xiangbing Zeng;Goran Ungar;Takashi Kato
在有机材料中切换一维离子电导率是一项具有挑战性的任务。最近，我们发现液晶N，N，N-三甲基-3，4，5-三十二烷氧基苯胺盐的电导率发生了四个数量级的显著变化，这是由矩形（Colr）和六方（Colh）柱状相之间的热致液晶相变引起的。在目前的研究中，我们已经成功地调整开关温度通过改变连接到苯胺环的LC材料的烷基链的长度。的N，N，N-三烷基苯胺阳离子，即，三甲基，二甲基乙基和二乙基甲基，和counterparts（BF 4，PF 6或CF 3SO 3）的大小在连续的Colr和Colh LC相的形成中起着至关重要的作用，这会影响开关行为。我们已经发现，Colr-Colh相变的温度和离子电导率的切换在N，N，N-三甲基苯胺四氟硼酸盐通过改变烷基链的长度来调谐。这些结果为离子导电自组装分子材料的设计提供了新的思路。
Switching one-dimensional ion conductivities in organic materials is a challenging task. Recently we found that a liquid-crystalline (LC) N,N,N-trimethyl-3,4,5-tridodecyloxy-anilinium salt showed a remarkable change in the conductivities of about four orders of magnitude, which was triggered by a thermotropic LC phase transition between rectangular (Colr) and hexagonal (Colh) columnar phases. In the present study, we have succeeded in tuning the switching temperature by changing the length of the alkyl chains attached to the anilinium ring of LC materials. The size of the N,N,N-trialkylanilinium cations, that is, trimethyl, dimethylethyl and diethylmethyl, and the counterion (BF4, PF6 or CF3SO3) play a crucial role in the formation of successive Colr and Colh LC phases, which affect the switching behaviour. We have found that the temperature of the Colr–Colh phase transition and the switching of ion conductivity are tuned in N,N,N-trimethylanilinium tetrafluoroborates by changing the length of the alkyl chains. These results give new insights into the design of ion-conductive self-assembled molecular materials.