Department of Chemistry, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.
Department of Chemistry, Rajshahi University, Rajshahi, 6205, Bangladesh.
J Fluoresc. 2019 Jul;29(4):1049-1056. doi: 10.1007/s10895-019-02418-9. Epub 2019 Jul 23.
The optical properties of a series of side chain liquid crystalline polymers (P1-P3) containing azo-benzothiazole mesogen with different terminal substituents (-H, -CH and -OCHCH) in four organic solvents of varying polarity have been investigated by absorption and fluorescence spectral analysis. Solvatochromic studies of P1-P3 did not show any regular variation on the absorption and emission intensities with changing the polarity of solvent. Theoretical studies were performed based on different solvent correlation methods such as Dimroth-Reichardt and Kamlet-Taft methods to investigate the solute-solvent interactions. Both absorption and emission maxima of investigated polymers were bathochromically shifted with the replacement of sixth position hydrogen atom by electron donating groups in benzothiazole moiety. The emission intensities of the studied polymers showed decreasing trend with increasing temperature.
研究了一系列含有偶氮苯并噻唑介晶的侧链液晶聚合物（P1-P3）在四种不同极性有机溶剂中的光学性质，这些聚合物的末端取代基分别为-H、-CH 和-OCHCH。通过吸收和荧光光谱分析进行了溶剂变色研究。P1-P3 的溶剂变色研究没有显示出吸收和发射强度随溶剂极性变化的任何规律变化。根据不同的溶剂相关方法（如 Dimroth-Reichardt 和 Kamlet-Taft 方法）进行了理论研究，以研究溶质-溶剂相互作用。取代苯并噻唑部分第六位氢原子的给电子基团会使所研究聚合物的吸收和发射最大值发生红移。随着温度的升高，研究聚合物的荧光强度呈下降趋势。
