Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, School of Chemistry and Molecular Engineering, East China Normal University , Shanghai 200241, China.
Institute of Electrochemical and Energy Technology, Department of Chemical Engineering, Shanghai Jiao Tong University , Shanghai 200240, China.
ACS Appl Mater Interfaces. 2017 Apr 19;9(15):13415-13421. doi: 10.1021/acsami.6b16423. Epub 2017 Apr 7.
A new fluorescent polyimide covalent organic framework (PI-COF) has been successfully synthesized through solvothermal route using tetra(4-aminophenyl) porphyrin and perylenetracarboxylic dianhydride, which possesses porous crystalline and excellent thermal stability (>500 °C). Furthermore, few-layered PI covalent organic nanosheets (PI-CONs) can be easily obtained from the fluorescent PI-COF through a facile liquid phase exfoliation approach, which were confirmed by atomic force microscopy and transmission electron microscopy analysis. It is interesting that the fluorescent intensity of PI-CONs is obviously enhanced relative to that of PI-COF. The PI-CONs have been successfully utilized as an efficient fluorescent probe for the highly sensitive and selective detection of 2,4,6-trinitrophenol (TNP). The mechanism might be attributed to the combination of electron transfer and inner filter effect based on DFT calculations and spectral overlap data. The system exhibits a good linear response toward TNP over the range from 0.5 to 10 μM with a detection limit of 0.25 μM.
一种新型荧光聚酰亚胺共价有机骨架（PI-COF）通过溶剂热法成功合成，使用四（4-氨基苯基）卟啉和均苯四甲酸二酐，具有多孔结晶和优异的热稳定性（>500°C）。此外，通过简单的液相剥离方法，很容易从荧光 PI-COF 中获得少层 PI 共价有机纳米片（PI-CONs），原子力显微镜和透射电子显微镜分析证实了这一点。有趣的是，PI-CONs 的荧光强度相对于 PI-COF 明显增强。PI-CONs 已成功用作高效荧光探针，用于高灵敏度和选择性检测 2,4,6-三硝基苯酚（TNP）。根据 DFT 计算和光谱重叠数据，该机制可能归因于电子转移和内滤效应的结合。该体系在 0.5 至 10 μM 的范围内对 TNP 表现出良好的线性响应，检测限为 0.25 μM。
