Facile crosslinking of polythiophenes by polyethylenimine via ester aminolysis for selective Cu(II) detection in water.
Facile crosslinking of polythiophenes by polyethylenimine via ester aminolysis for selective Cu(II) detection in water.
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DOI：
10.1016/j.bios.2018.03.028
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发表时间：
2018-06
影响因子：
12.6
通讯作者：
Xuewei Wang;Chi Zhang;Yajie Zhang;Jian Sun;Leilei Cao;Jinkai Ji;F. Feng
中科院分区：
文献类型：
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作者：
Xuewei Wang;Chi Zhang;Yajie Zhang;Jian Sun;Leilei Cao;Jinkai Ji;F. Feng
π-共轭聚合物的官能化被认为是刚性和疏水主链在水中的增溶作用。然而，聚合物聚集总是存在的，并导致光谱特性的复杂性和再现性的问题。在此，我们报道了一种简单而稳健的方法，通过交联策略制备一系列共轭聚合物纳米结构。在温和条件下，通过酯氨解反应，将不同链长的聚硫酮与支链聚乙烯亚胺（PEI）进行官能化，得到了具有多价性的聚硫酮。光物理研究表明，共轭主链可以很好地稳定和分散在水中。通过利用铜离子和阳离子PEI之间的分子间识别相互作用，我们应用交联聚噻吩作为纳米探针，在非常低的浓度（0.01 mg/mL），以荧光检测铜离子，具有高达10 nM的高灵敏度和选择性超过其他金属离子在水溶液中，没有发生可检测的聚集体。我们的纳米探针的整体性能优于已报道的基于水溶性聚合物的探针，特别是在探针可用性和操作以及选择性铜检测能力方面。
Functionalization of π-conjugated polymers is dispensable for solubilization of the rigid and hydrophobic backbones in water. However, polymer aggregation is always present and leads to issues with complication and reproducibility in spectral properties. Herein, we reported a simple and robust method to make a series of conjugated polymer nanostructures by a crosslinking strategy. In favor of multivalency effect, polythionenes with various chain lengths were functionalized with branched polyethylenimine (PEI) via ester aminolysis reaction under mild conditions. Photophysical studies revealed the conjugated backbones could be well stabilized and dispersed in water. By taking advantage of intermolecular recognition interaction between copper ions and cationic PEI, we applied crosslinked polythiophenes as a nano probe at very low concentration (0.01 mg/mL) to fluorescently detect copper ions with high sensitivity up to 10 nM and selectivity over other metal ions in aqueous solutions, without occurrence of detectable aggregates. The overall performance of our nano probes outperforms reported water-soluble polymers-based probes, particularly in probe availability and manipulation as well as selective copper detection capability.