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Issue 18, 2018
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A novel pillar[5]arene-based supramolecular organic framework gel to achieve an ultrasensitive response by introducing the competition of cation⋯π and π⋯π interactions

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Abstract

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⋯π and π⋯π 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⋯π and π⋯π 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 × 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 × 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.

Graphical abstract: A novel pillar[5]arene-based supramolecular organic framework gel to achieve an ultrasensitive response by introducing the competition of cation⋯π and π⋯π interactions

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Publication details

The article was received on 02 Mar 2018, accepted on 05 Apr 2018 and first published on 13 Apr 2018


Article type: Paper
DOI: 10.1039/C8SM00426A
Citation: Soft Matter, 2018,14, 3624-3631
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    A novel pillar[5]arene-based supramolecular organic framework gel to achieve an ultrasensitive response by introducing the competition of cation⋯π and π⋯π interactions

    Y. Zhang, Y. Li, K. Zhong, W. Qu, X. Chen, H. Yao, T. Wei and Q. Lin, Soft Matter, 2018, 14, 3624
    DOI: 10.1039/C8SM00426A

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