Highly Selective and Sensitive Detection of Cyanide by a Reaction-Based Conjugated Polymer Chemosensor

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• 作者：Xiaofu Wu ; Bowei Xu ; Hui Tong ; Lixiang Wang
• 刊名：Macromolecules
• 出版年：2011
• 出版时间：June 14, 2011
• 年：2011
• 卷：44
• 期：11
• 页码：4241-4248
• 全文大小：1049K
• 年卷期：v.44,no.11(June 14, 2011)
• ISSN：1520-5835

文摘

Based on a specific nucleophilic addition reaction with cyanide, a dicyano-vinyl-containing conjugated polymer (P1) has been designed and synthesized as a colorimetric and fluorescent chemosensor for cyanide anion. The combination of advantages of both reaction-based sensors and conjugated polymer sensors offers its highly sensitive and selective recognition of CN^{鈥?/sup>. The addition of CN鈥?/sup> to P1 solution induced a change in the solution color from yellow-green to colorless, while no color change could be observed in presence of other common anions, by which CN鈥?/sup> can be identified from other anions directly with the naked eye. At the same time, a 31.6-fold fluorescence quenching was achieved upon adding CN鈥?/sup> into P1 solution. The fluorescence quenching has shown a linear response to CN鈥?/sup> in the concentration range of 0.5鈥?0 渭M. Furthermore, its detection limit for CN鈥?/sup> can be as low as 14 ppb, which is among the best results for the fluorescent conjugated polymer-based cyanide chemosensors. Compared with its small molecular counterpart, P1 exhibits higher sensitivity and selectivity, wider linear region, and faster response.}