Mechanoresponsive liquid crystals exhibiting reversible luminescent color changes at ambient temperature
Mechanoresponsive liquid crystals exhibiting reversible luminescent color changes at ambient temperature
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DOI：
10.1039/c5tc03578c
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发表时间：
2016-01-01
影响因子：
6.4
通讯作者：
Kato, Takashi
中科院分区：
文献类型：
--
作者：
Mitani, Masato;Ogata, Shuhei;Kato, Takashi
合成了含低聚噻吩衍生物的力致变色发光液晶。这些液晶（LC）分子具有双，三，和quarter噻吩部分表现出剪切诱导的相变伴随着它们的发光颜色在环境温度下的变化。剪切诱导的LC相和它们的发光颜色在环境温度下的热老化过程期间自发地回复到初始LC相和初始发光颜色，因为剪切诱导的LC相是亚稳相。这三种化合物显示出不同的发光颜色，并覆盖了宽的可见光区。三噻吩和四噻吩衍生物比联噻吩衍生物更快地恢复它们的初始发光颜色，这表明不仅发光颜色而且刺激响应性质可以通过简单地改变发光介晶的p-共轭长度来调节。
Mechanochromic luminescent liquid crystals containing oligothiophene derivatives have been obtained. These liquid-crystalline (LC) molecules having bi-, ter-, and quarterthiophene moieties exhibit shear-induced phase transitions accompanied by changes in their luminescent colors at ambient temperature. The shear-induced LC phases and their luminescent colors spontaneously revert back to the initial LC phases and the initial luminescent colors during the thermal aging processes at ambient temperature because the shear-induced LC phases are metastable phases. These three compounds show various luminescent colors and cover a wide visible region. The terthiophene and quaterthiophene derivatives recover their initial luminescent colors faster than the bithiophene derivative, indicating that not only the luminescent colors but also the stimuli-responsive properties are tunable through simple change of the p-conjugated length of the luminescent mesogen.