中文摘要：

设计合成了一种新型的共轭聚电解质P1,在其侧链引入磺酸官能团主链中引入了间位取代的吡啶官能团,实现了对水溶液中pH的检测.作为一种pH探针,随着酸浓度的增加,P1的颜色和荧光会发生剧烈变化.动态光散射数据表明,这些变化与聚电解质中吡啶官能团的质子化引起的链间团聚有关.该研究为改变主链结构而有效地调控共轭聚电解质的pH检测性能提供了可行性.

英文摘要：

A novel conjugated polyelectrolyte containing meta-substituted pyridyl groups in the backbone（P1） and sulfonate groups in the side chain is reported as an optical pH-sensitive probe in aqueous solution.The ability of P1 to function as a colorimetric and fluorescent pH probe was demonstrated with dramatic color and fluorescence changes upon introduction of acid.These photophysical responses were attributed to the protonation of pyridyl units accompanied with an aggregation behavior of P1 in acidic solution,which is confirmed by dynamic light scattering.This work presents the feasibility of varying the mainchain structures to fine-tune the pH-dependent properties of the resulting conjugated poly-electrolytes（CPEs）.