A novel pillar[5]arene-based supramolecular organic framework gel to achieve an ultrasensitive response by introducing the competition of cation...pi and pi...pi interactions

作者：Zhang, You-Ming^*; Li, Yong-Fu; Zhong, Kai-Peng; Qu, Wen-Juan; Chen, Xiao-Peng; Yao, Hong; Wei, Tai-Bao; Lin, Qi

来源：Soft Matter, 2018, 14(18): 3624-3631.

DOI：10.1039/c8sm00426a

• FLUORESCENCE DETECTION
• CO2 ADSORPTION
• POLYMER
• CONSTRUCTION
• COMPLEXATION
• ARENE
• COORDINATION
• REMOVAL

Ultrasensitive response properties are an intriguing concern for stimuli-responsive materials. Herein, we report a novel method to achieve an ultrasensitive response by introducing the competition of cation...pi and pi...pi interactions into a pillar[5]arene-based supramolecular organic framework (SOF-AMP). SOF-AMP was constructed with a novel bis-naphthalimide functionalized pillar[5]arene, which was able to form a stable supramolecular gel (SOF-AMP-G) in cyclohexanol. Interestingly, SOF-AMP-G shows an ultrasensitive response to Fe3+ through the competition of cation...pi and pi...pi interactions. Meanwhile, the Fe3+ coordinated SOF (MSOF-Fe) shows an ultrasensitive response to H2PO4-. SOF-AMP-G displayed yellow fluorescence whereas, after the addition of 0.5 equiv. of Fe3+ to SOF-AMP-G, the yellow fluorescence was quenched. The detection limit of SOF-AMP-G for Fe3+ is 7.54 x 10(-9) M. More interestingly, the Fe3+ coordinated SOF gel (MSOF-Fe-G) could sense H2PO4- with a fluorescence turn-on. The detection limit of MSOF-Fe-G for H2PO4- is 4.21 x 10(-9) M. Simultaneously, the Fe3+ and H2PO4- responsive thin films based on these SOF gels were prepared. Moreover, these SOF gels could be used as ultrasensitive ion sensors, fluorescent display materials and sensitive logic gates.

• 出版日期2018-5-14
• 单位西北师范大学