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Ratiometric fluorescence anion sensor based on inhibition of excited-state intramolecular proton transfer (ESIPT) |
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| Authors: | Ge Liu Baoli Li Jie Shao |
| Affiliation: | 1. Department of Chemistry, Chifeng University, Chifeng, 024000, China 2. Anyang Institute of Technology, Anyang, 455000, China 3. College of Chemistry, Chemical Engineering and Material Science, Soochow University, Suzhou, 215123, China |
| Abstract: | A colorimetric and ratiometric fluorescence anion sensor 1 was designed and synthesized according to site-signalling subunit approach. The sensor exhibited visible color changes from yellow to purple upon addition of the strong basic anions such as acetate. The ratiometric fluorescence changes with significant blue shift about 140 nm were observed during the fluorescence titrations. Such ratiometric fluorescence changes could be due to inhibition of excited-state intramolecular proton transfer (ESIPT). The 1H NMR titrations indicated that the sensor 1 showed deprotonation in presence of large amounts of acetate ion. Therefore, ESIPT was inhibited owing to presence of deprotonation of phenol unit. |
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