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Synthesis of a conjugated polymer for sensing ferric/ferrous cations based on dual responses
Journal of Polymer Science ( IF 3.4 ) Pub Date : 2020-07-12 , DOI: 10.1002/pol.20200231
Yichen Zhang 1 , Hao Zhan 1 , Jiajun Chen 1 , Lijuan Sun 1 , Li‐Juan Fan 1, 2
Affiliation  

A conjugated polymer (PPETE‐RB) with poly[p‐(phenylene ethynylene)‐alt‐(thienylene‐ethynylene)] (PPETE) as the backbone with pendant rhodamine B (RB) groups in the close‐ring spirolactam form was synthesized. With long spacer between backbone and pedant groups as well as long solubilizing side chains, the polymer possesses good solubility in most organic solvents and relatively large molecular weight. The fluorescence of the conjugated polymer in THF exhibited selective dual responses upon adding Fe3+/Fe2+ but negligible response upon other cations. The emission around 481 nm (excited at 360 nm) decreased and that around 571 nm (excited at 520 nm) emerged and increased when increasing the concentration of iron ions. The responses to Fe3+ and Fe2+ are very similar. The limits of detection were found to fall in between 6 μM and 8 μM. The mechanism study showed that the quenching around 481 nm was due to the inner filter effect (IFE) between the Fe3+/Fe2+ and PPETE‐RB; while that enhancement around 571 nm could be attributed to the formation of fluorescent ring‐open structure from nonfluorescent spirolactam of pedant RB group upon Fe3+/Fe2+. Such dual and opposite responses provided more reliable information than single response for sensing applications.

中文翻译:

基于双重响应合成用于检测铁/亚铁阳离子的共轭聚合物

共轭聚合物(PPETE-RB)与聚[ p - (苯撑乙炔) - ALT - (亚噻吩亚乙炔)](PPETE)作为具有侧挂若丹明B(RB)组的紧密环螺内酰胺形式的主链被合成。该聚合物在主链和助剂基团之间具有长的间隔基,并且具有长的可溶侧链,因此它在大多数有机溶剂中具有良好的溶解性,并且具有相对较大的分子量。加入Fe 3+ / Fe 2+后,共轭聚合物在THF中的荧光表现出选择性的双重响应。但对其他阳离子的反应微不足道。当增加铁离子浓度时,在481 nm(在360 nm处激发)附近的发射减少,而在571 nm(在520 nm处激发)附近的发射出现并增加。对Fe 3+和Fe 2+的响应非常相似。发现检测限在6μM和8μM之间。机理研究表明,在481 nm附近猝灭是由于Fe 3+ / Fe 2+与PPETE-RB之间的内部滤光效应(IFE)引起的。而571 nm附近的增强可能是由于Fe 3+ / Fe 2+引起的RB族非荧光螺内酰胺形成了荧光开环结构。对于感测应用,这种双重和相反的响应提供了比单一响应更可靠的信息。
更新日期:2020-07-12
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