Synthesis of fluorescent and pH probes based on schiff base and their application in metal ions screening
碩士 === 國立彰化師範大學 === 化學系 === 106 === The purpose of this study is to synthesize a series of compounds which based on Schiff base as the main structure. These fluorescence sensors C1, C2, C3, C4 and C5 are synthesized by coupling of amine groups and aldehyde groups derivatives. Their sensing propertie...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2018
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| Online Access: | http://ndltd.ncl.edu.tw/handle/25uy63 |
| Summary: | 碩士 === 國立彰化師範大學 === 化學系 === 106 === The purpose of this study is to synthesize a series of compounds which based on Schiff base as the main structure. These fluorescence sensors C1, C2, C3, C4 and C5 are synthesized by coupling of amine groups and aldehyde groups derivatives. Their sensing properties were further investigated among a series of anions and cations by the UV-visible and the fluorescent spectroscopy experiments. C1, C2 and C3 exhibited highly selective recognition toward Zn2+. C4 and C5 display highly selective recognition toward Al3+. All of them display remarkable fluorescence enhancement after binding metal ions.
The above sensors (C1-C5) can detect metal ions with ppm scale in water environment. These metal ions in the C1~C5 complex can be replaced by EDTA that indicating these sensors are reversible.
The effects of pH on the fluorescence bands of these metal complexes have also been examined. It was found that the fluorescence intensity of C2–Zn2+ showed a significant fluorescence band in the neutral condition. C3–Zn2+ showed a significant fluorescence band in the acidic condition. C4 and C5 complex showed a significant fluorescence band in pH range 3–10. The solution of C2-C4 complex showed a dramatic color change from colorless to yellow when the pH value was changed from 2 to 12. The result showed that sensors C2-C4 could be applied in a wide aqueous environmental analysis.
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