期刊
ACS APPLIED MATERIALS & INTERFACES
卷 3, 期 12, 页码 4649-4656出版社
AMER CHEMICAL SOC
DOI: 10.1021/am201069n
关键词
fluorescent sensor; cyanide anion; spiropyran; coumarin; polymer
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) [23656504]
- Japan Society for the Promotion of Science (JSPS)
- 'Global Education and Research Center for Bio-Environmental Chemistry' of Osaka University
- Grants-in-Aid for Scientific Research [23656503, 23656504] Funding Source: KAKEN
A simple copolymer consisting of N-isopropylacrylamide and coumarin-conjugated spiropyran (CS) units, poly(NIPAM-co-CS), has been synthesized. This polymer enables selective fluorometric detection of cyanide anion (CN(-)) in water at room temperature. The polymer itself shows almost no fluorescence, but shows a strong blue fluorescence in the presence of CN(-) under irradiation of UV light. The fluorescence enhancement occurs via a nucleophilic interaction between CN(-) and the photoformed merocyanine form of the CS unit, leading to a localization of pi-electrons on the coumarin moiety. The polymer enables accurate determination of very low levels of CN(-) (>0.5 mu M). The polymer can be recovered from water by simple centrifugation at high temperature (>40 degrees C), due to the heat-induced aggregation of the polymer. In addition, the polymer is regenerated by simple acid treatment, and the resulting polymer is successfully reused for further CN(-) sensing without loss of sensitivity.
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