Naked-eye detection of Hg(II) ions by visible light-induced polymerization initiated by a Hg(II)-selective photoredox catalyst,Polymer Chemistry

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Naked-eye detection of Hg(II) ions by visible light-induced polymerization initiated by a Hg(II)-selective photoredox catalyst
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-1-7 , DOI: 10.1039/d0py01616k
Hyungwook Kim _{1,

2,

3} , Young Jae Jung _{1,

2,

3} , Jungkyu K. Lee _{1,

2,

3}

Affiliation

We developed a novel strategy for signal amplification using a visible light-induced photopolymerization, initiated by a selective turn-on photoredox catalyst. As photoredox catalysts, fluorescein derivatives are able to initiate photopolymerization and rapidly form a polymeric hydrogel in the presence of oxygen under visible light. Moreover, they exhibit selective chromogenic and fluorogenic responses to transition metal ions in the visible region of light. In this work, we employed fluorescein hydrazide as a switchable photoredox catalyst for the generation of a colorimetric readout of Hg(II) ions via the visible light-induced photopolymerization of N-vinylpyrrolidone and poly(ethylene glycol) diacrylate under aerobic conditions. Compared to ultraviolet–visible (UV–Vis) spectroscopy, this photopolymerization-based signal amplification yielded about 20 times higher sensitivity and enabled the naked-eye detection of Hg(II) ions with concentrations down to 0.1 μM.

中文翻译：

汞（II）选择性光氧化还原催化剂引发的可见光诱导聚合的裸眼检测汞（II）离子

我们开发了一种由可见光诱导的光聚合作用进行信号放大的新策略，该方法由选择性开启光氧化还原催化剂引发。作为光氧化还原催化剂，荧光素衍生物能够引发光聚合并在可见光下在氧气存在下迅速形成聚合物水凝胶。而且，它们对光的可见光区域中的过渡金属离子表现出选择性的生色和荧光响应。在这项工作中，我们采用荧光素酰肼作为可切换的光氧化还原催化剂，通过可见光诱导的N的光聚合反应，生成Hg（II）离子的比色读数。-乙烯基吡咯烷酮和聚乙二醇二丙烯酸酯在有氧条件下。与紫外可见（UV-Vis）光谱相比，这种基于光聚合的信号放大灵敏度高出约20倍，并且可以用肉眼检测浓度低至0.1μM的Hg（II）离子。

更新日期：2021-01-11

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