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Aggregation-induced fluorescent response of urea-bearing polyphenyleneethynylenes toward anion sensing
Science and Technology of Advanced Materials ( IF 5.5 ) Pub Date : 2021-08-03 , DOI: 10.1080/14686996.2021.1942982
Jian Li 1, 2 , Muhammad Saleem 1 , Qian Duan 3 , Toyoji Kakuchi 3, 4 , Yougen Chen 1
Affiliation  

ABSTRACT

A π-conjugated urea-bearing phenyleneethynylene polymer (Poly-2) was rationally designed by the Sonogashira coupling condensation reaction and had been demonstrated to have a unique fluorescent quenching effect for the optical detection of all determined anions, especially for CN. The fluorescent emission of Poly-2 was significantly quenched upon adding CN, together accompanied with a continuous red shift of the emission peak from 442 to 464 nm with the cyanide concentration increased from 0 to 1.0 mM. On the contrary, its precursor polymer, Poly-1, itself also displayed fluorescent responsibility with all selected anions but had no obvious selectivity and tendency. For instance, the addition of highly basic CN, N3, AcO, or F to Poly-1 solution in DMF/H2O (v/v = 1:1) led to the photoluminescence amplification, while the addition of weakly basic anions like Cl, I, and Br showed a fluorescence quenching effect. Both polymers were in a seriously self-aggregated state in solution no matter in the absence or presence of an anion. Interestingly, it was found that Poly-2 exhibited an aggregation-induced emission behavior, while Poly-1 had an aggregation-caused quenching effect, based on the relationship between photoluminescence and polymer aggregation state. The structural characterizations were carried out by NMR spectroscopy and size exclusion chromatography measurements; the photoluminescence properties of Poly-1 and Poly-2 together with anion sensing properties were followed by fluorescence spectroscopy, and the relationship between photoluminescence and aggregation behavior of both polymers in solution was investigated by dynamic light scattering measurements.



中文翻译:

含尿素聚苯乙炔对阴离子传感的聚集诱导荧光响应

摘要

通过 Sonogashira 偶联缩合反应合理设计了一种带有 π 共轭脲的亚苯基乙炔聚合物 ( Poly-2 ),并已被证明具有独特的荧光猝灭效应,可用于光学检测所有确定的阴离子,尤其是 CN -Poly-2的荧光发射在加入 CN -后显着猝灭,同时伴随着发射峰从 442 到 464 nm 的连续红移,氰化物浓度从 0 增加到 1.0 mM。相反,它的前体聚合物Poly-1,本身也对所有选定的阴离子显示荧光反应,但没有明显的选择性和趋势。例如,除了高碱性CN的-,N 3 -,ACO -或F -聚-1的DMF溶液/ H 2 O(V / V = 1:1)导致光致发光的扩增,而加入Cl -、I -和 Br -等弱碱性阴离子的荧光猝灭效应。无论是否存在阴离子,两种聚合物在溶液中都处于严重的自聚集状态。有趣的是,发现Poly-2 基于光致发光与聚合物聚集态之间的关系,表现出聚集诱导的发射行为,而Poly-1具有聚集引起的猝灭效应。通过核磁共振光谱和尺寸排阻色谱测量进行结构表征;Poly-1Poly-2的光致发光特性以及阴离子传感特性被荧光光谱跟踪,并通过动态光散射测量研究了两种聚合物在溶液中的光致发光和聚集行为之间的关系。

更新日期:2021-08-04
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