Alkaline earth cation-mediated photoluminescent complexes of thioflavin T with twisted cucurbit[14]uril

作者：Wang, Cheng-Hui; Tang, Qing; Zhang, Jing; Yao, Yu-Qing; Xiao, Xin; Huang, Ying^*; Tao, Zhu^*

来源：New Journal of Chemistry, 2018, 42(11): 9244-9251.

DOI：10.1039/c7nj04115b

• HOST-GUEST INTERACTIONS
• OUTER-SURFACE INTERACTIONS
• SUPRAMOLECULAR ARCHITECTURES
• MICROFLUIDIC DROPLETS
• AQUEOUS-SOLUTION
• CHEMISTRY
• CUCURBITURIL
• MACROCYCLES
• DERIVATIVES
• MICROCAPSULES

We report alkaline earth metal ion-mediated solid photoluminescent complexes of thioflavin T (ThT) with twisted cucurbit[14]uril (tQ[14]) for the first time. The interaction with tQ[14] enhanced the fluorescence of ThT in aqueous solution. Indeed, the fluorescence intensity of ThT increased rapidly with increasing amount of tQ[14] up to a tQ[14]:ThT ratio of 15. Interestingly, at lower tQ[14]:ThT ratios (1:1), the introduction of alkaline earth metal cations (AE(2+)) into the tQ[14]-ThT interaction system led to fluorescence quenching of ThT, except in the case of Mg2+ cation, which led to an initial fluorescence enhancement, followed by gradual fluorescence quenching of ThT. At higher tQ[14]:ThT ratios (1:15), the introduction of alkaline earth metal cations into the tQ[14]-ThT interaction system led to the precipitation of solid tQ[14]/ThT/AE(2+) interaction products, which emitted strong blue fluorescence, except in the case of Sr2+ cation, which exhibited fluorescence quenching of ThT without any solid precipitation. Thus, the tQ[14]-ThT interaction system shows potential applications not only for preparing stimuli-responsive supramolecular photoluminescent materials, but also for identifying Mg2+ at lower tQ[14]:ThT ratios and Sr2+ at higher tQ[14]:ThT ratios.

• 出版日期2018-6-7
• 单位贵州大学