Wu Jing-Xing, Yan Bing
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, PR China.
Dalton Trans. 2017 Nov 7;46(43):15080-15086. doi: 10.1039/c7dt03393a.
A highly selective and sensitive ratiometric fluorescent probe for copper ions (Cu) in aqueous solution based on a blue zirconium metal-organic framework [UiO-66-(COOH)] with red bandgap fluorescent carbon quantum dots (R-BF-CQDs) is developed. UiO-66-(COOH) displays broad ligand-centered (LC) emission and R-BF-CQDs shows red emission. Interestingly, the remaining -NH at the surface of the prepared R-BF-CQDs can coordinate Cu efficiently and produce a strong visible absorption, which overlaps the emission of UiO-66-(COOH). There is also a strong coordination capacity of the Cu ions with R-BF-CQDs and UiO-66-(COOH), which allows the energy donor and the energy receptor to be closer together. Both of these two conditions provide the possibility of spectral energy transfer. In practice, the LC emission of UiO-66-(COOH) becomes weaker with increasing concentration of Cu, whereas the red fluorescence of R-BF-CQDs increases slightly.
基于具有红色带隙荧光碳量子点（R-BF-CQDs）的蓝色锆基金属有机框架[UiO-66-(COOH)]，开发了一种用于水溶液中铜离子（Cu）的高选择性和灵敏的比率荧光探针。UiO-66-(COOH)表现出宽的配体中心（LC）发射，而R-BF-CQDs表现出红色发射。有趣的是，制备的R-BF-CQDs表面剩余的-NH可以有效地与Cu配位并产生强烈的可见吸收，这与UiO-66-(COOH)的发射重叠。Cu离子与R-BF-CQDs和UiO-66-(COOH)也有很强的配位能力，这使得能量供体和能量受体靠得更近。这两个条件都提供了光谱能量转移的可能性。实际上，随着Cu浓度的增加，UiO-66-(COOH)的LC发射变弱，而R-BF-CQDs的红色荧光略有增加。
