Reversible shape memory two-dimensional covalent organic frameworks
Mingchao Shao1,2, Jinyang Chen1,3, Wenqiang Gao1,4
1Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, PR China.
None:
Two-dimensional covalent organic frameworks are a unique type of organic crystals with both weak layer-layer interaction and regular one-dimensional nanochannels. Therefore, it is possible to synthesize two-dimensional covalent organic frameworks with reversible stacking phases and thus pore sizes, which hold great potential applications in future nanoelectronics, nanoreactors, intelligent response, gas separation and storage. However, such a goal remains challenging up to now, because the slipped AA-stacking is the most thermodynamically stable phase. Here, we report the realization of shape memory two-dimensional covalent organic frameworks with reversible interlayer stacking sequences, of which AA and inclined phases are induced by the formation of hot ice and the strongly adsorbed organic molecules like Tetrahydrofuran inside the two-dimensional covalent organic frameworks confined nanochannels, respectively. Based on the reversible pore sizes and pore environments, we demonstrate the feasibility of the shape memory two-dimensional covalent organic frameworks in dynamically tunable permeability and intelligent response.
More Related Videos
Related Concept Videos
Conformations of Cyclohexane
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
Chair Conformation of Cyclohexane
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
Newman Projections
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution
Network Covalent Solids
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Molecular Shape and Polarity


