Coumarin Grafted Polyethylene Matrix as Colorimetric and Fluorescent Chemosensor for Metal Ions,Macromolecular Chemistry and Physics

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Coumarin Grafted Polyethylene Matrix as Colorimetric and Fluorescent Chemosensor for Metal Ions
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-10-07 , DOI: 10.1002/macp.202000242
Mireille Vonlanthen ₁ , Sandra M. Rojas‐Montoya ₁ , Fabián Cuétara‐Guadarrama ₁ , Ricardo D. Martínez‐Serrano ₁ , Guillermina Burillo ₂ , Ernesto Rivera ₁

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A coumarin‐based chemosensor is synthesized and grafted onto a polyethylene (PE) surface by means of gamma radiation. The obtained polymeric film results to work as test‐paper‐like colorimetric sensor for the detection of Cu²⁺ ions. After immersion of the grafted PE film into a solution of Cu²⁺ in chloroform/methanol (8/2), a color change from colorless to green is observed by naked eye together with a quenching of the fluorescence emission. Control experiment with methoxy‐grafted PE films shows no response after the immersion in the same Cu²⁺ solution. The polymeric sensor can be washed and reused over several cycles for the detection of Cu²⁺. Moreover, the obtained polymeric sensor is used to detect Zn²⁺ by means of photoinduced electron transfer (PET) quenching disrupting mechanism. The fluorescence emission increases about three times after immersion in a solution containing Zn²⁺. A similar behavior is observed in the presence of acidic protons.

中文翻译：

香豆素接枝聚乙烯基质作为金属离子的比色和荧光化学传感器

合成基于香豆素的化学传感器，并通过伽马射线将其嫁接到聚乙烯（PE）表面上。所获得的聚合物膜结果可作为试纸样比色传感器，用于检测Cu ²⁺离子。将接枝的PE膜浸入Cu ²⁺的氯仿/甲醇（8/2）溶液中后，用肉眼观察到颜色从无色变为绿色，同时荧光发射猝灭。用甲氧基接枝的PE膜进行的对照实验显示，将其浸入相同的Cu ²⁺溶液中后无响应。可以清洗聚合物传感器，并在几个循环中重复使用以检测Cu ²⁺。此外，将获得的聚合物传感器用于检测Zn ²⁺通过光致电子转移（PET）淬灭破坏机制。浸入含Zn ²⁺的溶液后，荧光发射增加约三倍。在酸性质子的存在下观察到类似的行为。

更新日期：2020-11-04

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