Some new azobenzene liquid crystals involving chalcone and ester linkages
Some new azobenzene liquid crystals involving chalcone and ester linkages
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一些涉及查尔酮和酯键的新型偶氮苯液晶
DOI：
10.1039/c7ra06958h
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发表时间：
2017-09
期刊：
影响因子：
3.9
通讯作者：
Bian Zhanxi
中科院分区：
文献类型：
--
作者：
Zhu Xueyou;Yin Fengnan;Zhao Haiying;Chen Shufeng;Bian Zhanxi
合成并表征了5个新的含噻吩、萘或二茂铁的查尔酮和酯键偶氮苯衍生物。光敏偶氮苯基在紫外光下进行光异构化，并通过紫外可见光谱进行监测。含二茂铁化合物的循环伏安表现为准可逆的扩散控制氧化还原过程。根据热重测量，这些化合物表现出很高的热稳定性。差示扫描量热法、热偏光显微镜和粉末x射线衍射研究表明，含二茂铁的化合物和酯基侧端有三个或没有末端烷氧基链的化合物均无液晶行为。而末端烷氧基链在酯基一侧或末端烷氧基链在分子两端的化合物表现为对映间相，但后者具有狭窄的介生结构域。用萘环取代苯环增加介相单元的长度，导致间隙点和介相区域的增加。
Five new series of azobenzene derivatives containing thiophene, naphthalene or ferrocene with chalcone and ester linkages have been synthesized and characterized. The photosensitive azobenzene group underwent photoisomerization under UV light, which was monitored by UV-visible spectroscopy. The cyclic voltammograms of compounds containing ferrocene showed a quasi-reversible and diffusion-controlled redox process. These compounds displayed high thermal stability according to the thermogravimetry measurements. According to differential scanning calorimetry, thermal polarizing microscopy and powder X-ray diffraction studies, the compounds containing ferrocene and the compounds with three or no terminal alkoxy chains on the side of the ester group all showed no liquid crystal behaviour. However, the compounds with a terminal alkoxy chain on the side of the ester group or a terminal alkoxy chain at both ends of the molecule exhibited enantiotropic mesophases, but the latter had a narrow mesogenic domain. The increase of the length of the mesogenic unit by replacement of the benzene ring with a naphthalene ring resulted in both an increase in the clearing point and in an increase in the mesophase domain.
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