Mechanochromic Photoluminescent Liquid Crystals Containing 5,5′-Bis(2-phenylethynyl)-2,2′-bithiophene
Mechanochromic Photoluminescent Liquid Crystals Containing 5,5′-Bis(2-phenylethynyl)-2,2′-bithiophene
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DOI：
10.1080/15421406.2014.917499
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发表时间：
2014-05
影响因子：
0.7
通讯作者：
Masato Mitani;S. Yamane;Masafumi Yoshio;M. Funahashi;Takashi Kato
中科院分区：
文献类型：
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作者：
Masato Mitani;S. Yamane;Masafumi Yoshio;M. Funahashi;Takashi Kato
合成了一种含酰胺基树枝状结构的5，5 ′-二（2-苯乙炔基）-2，2 ′-联噻吩衍生物1。化合物1在从各向同性液体缓慢冷却时表现出矩形柱状相。相反，通过各向同性熔体的快速冷却，立方相形成为亚稳液晶相。机械剪切诱导的柱状晶相变，伴随着从黄绿色到绿色的光致发光颜色的变化。1的红外光谱表明，机械刺激可以诱导氢键的部分解离。这可能导致发色团的π堆叠的更多无序。
5,5′-Bis(2-phenylethynyl)-2,2′-bithiophene derivative 1 containing dendritic moieties linked through amide groups was synthesized. Compound 1 exhibits a rectangular columnar phase on slow cooling from the isotropic liquid. In contrast, a cubic phase is formed as a metastable liquid-crystalline phase by rapid cooling of the isotropic melt. Mechanical shearing induces a cubic–columnar phase transition, accompanied by the change of a photoluminescent color from yellow-green to green. The infrared spectra of 1 suggest that the mechanical stimuli can induce the partial dissociation of the hydrogen bond. This may lead to more disordering of the π-stacks of chromophores.