两亲性
发色团
苝
乙二醇
荧光
水溶液
二亚胺
化学
猝灭(荧光)
光化学
低临界溶液温度
高分子化学
聚合物
有机化学
共聚物
分子
物理
量子力学
作者
Bizhuo Wei,Huajing Li,Hunghao Chu,Huanhuan Dong,Yijun Zhang,Cai‐Li Sun,Yuangang Li
出处
期刊:Langmuir
[American Chemical Society]
日期:2024-03-14
卷期号:40 (12): 6493-6505
标识
DOI:10.1021/acs.langmuir.4c00106
摘要
This work presents a study of the thermally induced aggregation of perylene diimide (PDI) and naphthalene diimide (NDI) derivatives modified with oligo ethylene glycol (OEG) chains in aqueous solution. Water-soluble and flexible OEG side chains were introduced into the π-core of glutamate-modified NDI and PDI structures, and the aggregation process was modulated by heating or cooling in water. Interestingly, a rare opposite temperature response of fluorescent behavior from the two amphiphilic chromophores was revealed, in which the PDI exhibited fluorescent enhancement, while fluorescent quenching upon temperature increase was observed from the NDI assembly. The mechanism of thermally induced aggregation is clearly explained by studies with various spectroscopic techniques including UV–visible, fluorescence, 1H NMR, 2D NMR spectroscopy, and SEM observation as well as control experiments operated in DMSO solution. It is found that although similar J-aggregates were formed by both amphiphilic chromophores in aqueous solution, the temperature response of the aggregates to temperature was opposite. The degree of PDI aggregation decreased, while that of NDI increased upon temperature rising. This research paves a valuable way for understanding the complicated supramolecular behaviors of amphiphilic chromophores.
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