Mesogenic and optical properties of α,α′‐bis(4‐alkoxyphenylethynyl)oligothiophenes
Mesogenic and optical properties of α,α′‐bis(4‐alkoxyphenylethynyl)oligothiophenes
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α,α′-双(4-烷氧基苯乙炔基)低聚噻吩的介晶和光学性质
DOI：
10.1080/02678290500125863
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发表时间：
2005
期刊：
影响因子：
2.2
通讯作者：
Ken‐Tsung Wong
中科院分区：
文献类型：
--
作者：
Hsiu‐Fu Hsu;Shih;Hsiu‐Hui Chen;Chien‐Hsing Chen;Li;Chung;Kwei;C. Ong;Ken‐Tsung Wong
合成了α，α′-双（4-烷氧基苯乙炔基）低聚噻吩（联噻吩和三噻吩）液晶，研究了它们的介晶性和光学性质。它们都表现出一个层状的中间相，长烷氧基链的化合物也表现出层状相。增加噻吩单元的数目增加了转变温度和中间相范围。至于它们的光学性质，引入更多的噻吩单元导致吸收和发射光谱红移，量子效率略微增强，以及更大的斯托克位移。最重要的是，在吸收和发射最大值方面，发现一个4-烷氧基苯基乙炔基部分的掺入等同于添加一个噻吩环。
Liquid crystalline α,α′‐bis(4‐alkoxyphenylethynyl)oligothiophenes (bi‐ and ter‐thiophene) have been synthesized and their mesogenic behaviour and optical properties investigated. They all exhibited a nematic mesophase, and compounds with long alkoxy chains also showed lamellar phases. Increasing the number of thiophene units increased both the transition temperatures and the mesophase ranges. As for their optical properties, incorporating more thiophene units results in red‐shifted absorption and emission spectra, slightly enhanced quantum efficiency, and a larger Stoke's shift. Most importantly, in terms of the absorption and emission maxima, the incorporation of one 4‐alkoxyphenylethynyl moiety was found to be equivalent to adding one thiophene ring.