作者:André A. Vieira、Rodrigo Cristiano、Adailton J. Bortoluzzi、Hugo Gallardo
DOI:10.1016/j.molstruc.2007.05.006
日期:2008.3
Abstract A series of fluorescent 2,1,3-benzothiadiazole-based liquid crystals bearing a π-extended aromatic portion through C C triple bond was synthesized and characterized. The X-ray structure of the rigid core was performed. The mesomorphism and optical profile were evaluated. These compounds showed preferentially smectic C and nematic phases whose stability increase with the elongation of the π-extended
摘要 合成并表征了一系列通过CC三键带有π-延伸芳香部分的荧光2,1,3-苯并噻二唑基液晶。进行了刚性核心的 X 射线结构。评估了介晶现象和光学分布。这些化合物显示出优先的近晶 C 和向列相,其稳定性随着 π 扩展芳族部分的伸长而增加。溶液中的紫外-可见光谱在 410 和 470 nm(e ∼ 6.0–9.0 × 104 mol−1 cm−1)附近显示出类似的吸收模式。化合物在溶液中表现出从绿色到红色的荧光(λ em max = 500 – 610 nm),并显示出较大的斯托克位移(82–141 nm)和中等荧光量子产率(ΦF = 0.23–0.37)。只有含有苯基哌嗪单元的化合物显示出非常低的量子产率 (ΦF = 0.10)。