Fluorescence Aggregation-Caused Quenching versus Aggregation-Induced Emission: A Visual Teaching Technology for Undergraduate Chemistry Students
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- 作者：Xiaofeng Ma ; Rui Sun ; Jinghui Cheng ; Jiaoyan Liu ; Fei Gou ; Haifeng Xiang ; Xiangge Zhou
- 刊名：Journal of Chemical Education
- 出版年：2016
- 出版时间：February 9, 2016
- 年：2016
- 卷：93
- 期：2
- 页码：345-350
- 全文大小：340K
- ISSN：1938-1328
文摘
A laboratory experiment visually exploring two opposite basic principles of fluorescence of aggregation-caused quenching (ACQ) and aggregation-induced emission (AIE) is demonstrated. The students would prepared two salicylaldehyde-based Schiff bases through a simple one-pot condensation reaction of one equiv of 1,2-diamine with 2 equiv of salicylaldehyde. The resulting fluorescent dyes have similar chemical structures but possess ACQ and AIE properties, respectively. Their ACQ/AIE properties and pH sensing applications would then examined by visually qualitative analysis (UV lamp, light-emitting diode, and naked eye) and quantitative analysis (fluorometer). Finally, in a deeper level, X-ray single crystal structure analysis was utilized to reveal the inherent relationships between molecular structures/molecular arrangements and ACQ/AIE properties. This lesson is suitable for many areas of chemistry, especially for organic and analytical chemistry.