Highly luminescent liquid crystals by connecting 1,3,4-oxadiazole with thiazolo[5,4-d]thiazole units
作者:Arthur B.S. Santos、Alex M. Manfredi、Cristian A.M. Salla、Giliandro Farias、Edivandro Girotto、Juliana Eccher、Eduard Westphal、Sergio F. Curcio、Thiago Cazati、Ivani Malvestiti、Eduardo H.L. Falcão、Ivan H. Bechtold、Hugo Gallardo
DOI:10.1016/j.molliq.2020.114887
日期:2021.1
The direct bonding between a thiazolo[5,4-d]thiazole and two 1,3,4-oxadiazole units allowed us to create a new and versatile rigid core for luminescent liquid crystal, which showed interesting and variable mesomorphic and photophysical properties. From the 5-bis(5-phenyl-1,3,4-oxadiazol-2-yl)thiazolo[5,4-d]thiazole new core, three molecules with different number of alkoxy chains were synthesized and
噻唑并[5,4-d]噻唑和两个 1,3,4-噁二唑单元之间的直接键合使我们能够为发光液晶创造一种新的多功能刚性核心,它显示出有趣且可变的介观和光物理特性。从 5-双(5-苯基-1,3,4-噁二唑-2-基)噻唑并[5,4-d]噻唑新核心中,合成了三个具有不同烷氧基链数的分子,其性质与分子结构相关。具有两条链的分子表现出 smectic C 中间相,而具有 4 条和 6 条链的中间生体呈现六方柱状中等同形,POM 和 XRD 测量证实了这一点。此外,具有六条链的分子表现出接近室温的液晶行为。在溶液中,分子呈现出从蓝色到黄色的强光致发光,量子产率高于 0.6。激发态寿命允许将与不同发射物质相关的荧光分量与旋涂薄膜中的分子组织相关联。分子能级,以及热稳定性和分子堆积可能引起的电荷载流子传输,表明这些分子在光电应用中很有前景。总体而言,这项工作有助于开发噻唑并[5,4-d]噻唑在液晶中的使用,证明了其出色的效率和多功能性。