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首页> 外文期刊>ACS applied materials & interfaces >Multi-Stimuli Responsive FRET Processes of Bifluorophoric AlEgens in an Amphiphilic Copolymer and Its Application to Cyanide Detection in Aqueous Media
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Multi-Stimuli Responsive FRET Processes of Bifluorophoric AlEgens in an Amphiphilic Copolymer and Its Application to Cyanide Detection in Aqueous Media

机译：两亲共聚物中双氟肌肉的多刺激响应式褶皱工艺及其在含水介质中的氰化物检测中的应用

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摘要

A novel amphiphilic aggregation-induced emission (AIE) copolymer, that is, poly(NIPAM-co-TPE-SP), consisting of N-isopropylacrylamide (NIPAM) as a hydrophilic unit and a tetraphenylethylene-spiropyran monomer (TPE-SP) as a bifluorophoric unit is reported. Upon UV exposure, the close form of non-emissive spiropyran (SP) in poly(NIPAM-co-TPE-SP) can be photo-switched to the open form of emissive merocyanine (MC) in poly(NIPAM-co-TPE-MC) in an aqueous solution, leading to ratiometric fluorescence of AlEgens between green TPE and red MC emissions at 517 and 627 nm, respectively, via Forster resonance energy transfer (FRET). Distinct FRET processes of poly(NIPAM-co-TPE-MC) can be observed under various UV and visible light irradiations, acid-base conditions, thermal treatments, and cyanide ion interactions, which are also confirmed by theoretical studies. The subtle perturbations of environmental factors, such as UV exposure, pH value, temperature, and cyanide ion, can be detected in aqueous media by distinct ratiometric fluorescence changes of the FRET behavior in the amphiphilic poly(NIPAM-co-TPE-MC). Moreover, the first FRET sensor polymer poly(NIPAM-co-TPE-MC) based on dual AlEgens of TPE and MC units is developed to show a very high selectivity and sensitivity with a low detection limit (LOD = 0.26 mu M) toward the cyanide ion in water, which only contain an approximately 1% molar ratio of the bifluorophoric content and can be utilized in cellular bioimaging applications for cyanide detections.
机译：一种新的两亲聚集诱导的发射（AIE）共聚物，即聚（NiPam-Co-TPE-SP），由N-异丙基丙烯酰胺（NIPAM）作为亲水单元和四苯基 - 螺吡喃单体（TPE-SP）组成据报道了一条小氟化单位。在紫外线暴露时，聚（NIPAM-CO-TPE-SP）中的非发光螺吡喃（SP）的近似形式可以是光电切换到聚焦（NIPAM-CO-TPE- MC）在水溶液中，在517和627nm的绿色TPE和红色MC排放之间的含量的比例荧光分别通过福尔斯特共振能量转移（FRET）。在各种UV和可见光照射，酸碱条件，热处理和氰基离子相互作用下，可以观察到聚（NIPAM-CO-TPE-MC）的明显褶皱方法，这些方法也通过理论研究证实。通过两亲性聚（NIPAM-CO-TPE-MC）中的FRET行为的不同比例荧光变化，可以在水性介质中检测环境因素，例如UV暴露，pH值，温度和氰离子的微妙扰动。此外，基于TPE和MC单元的双均衡的第一FRET传感器聚合物聚（NIPAM-CO-TPE-MC）是开发的，以显示出非常高的选择性和灵敏度，朝向低检测极限（LOD =0.26μm）在水中的氰离子，其仅含有大约1％的二氟含量的摩尔比，并且可以用于氰化物检测的细胞生物分析应用中。

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