Adv. Mater., Professor Zhang Qichun, City University of Hong Kong: Design strategy for external stimulus-responsive 2D COFs

Functional response materials are materials whose physical and chemical properties can be reversibly changed under external stimuli

Figure 1 ( ab ) Typical topological structure characteristics of COF , HOF and MOF materials ; ( cd ) Response mechanism of 2D COFs materials under different chemical and physical stimuli
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Figure 2 Design mechanism and response behavior of pH stimulus-responsive 2D COFs materials
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Figure 3 Design mechanism and response behavior of solvent stimulus-responsive 2D COFs materials
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Figure 4 Design mechanism and response behavior of metal ion stimulus-responsive 2D COFs materials
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Figure 5 Design mechanism and response behavior of electrical stimulus-responsive 2D COFs materials
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Figure 6 Design mechanism and response behavior of light stimulus-responsive 2D COFs materials
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In short, in order to achieve stimulus-responsive 2D COFs , three main conditions must be met: first, a functional unit with specific stimulus-response behavior; second, it has abundant active sites because it can capture different guest molecules; and finally, specific The high molecular environment (such as oriented molecular arrangement, large free volume and strong π-π stacking) is an important condition for improving the response performance of smart devices
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In addition, in practical applications, stimulus-responsive 2D COFs are prone to spatial collapse, leading to degradation of their stability and crystallinity, which in turn affects their response performance, especially when exposed to a solvent-containing system for a long time

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references:

She P.
; Qin Y.
; Wang X.
; Zhang, Q.
, Recent Progress in External-Stimulus-Responsive 2D Covalent Organic Frameworks.
Adv.
Mater.
2021, 2101175.

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