Fluorescence Aggregation-Caused Quenching versus Aggregation-Induced Emission: A Visual Teaching Technology for Undergraduate Chemistry Students
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Xiaofeng Ma [1] ; Rui Sun [1] ; Jinghui Cheng [1] ; Jiaoyan Liu [1] ; Fei Gou [1] ; Haifeng Xiang [1] ; Xiangge Zhou [1]
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[1] Sichuan University
Sichuan University
China
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- Localización: Journal of chemical education, ISSN 0021-9584, Vol. 93, Nº 2, 2016, págs. 345-350
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
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.
