Porous covalent organic nanotubes and their assembly in loops and toroids

Abstract

Despite the noteworthy progress made in the nanotubular architectures with well-de ned lengths and diameter, the synthesis of a purely covalent bonded organic nanotube, so far, proved to be elusive. Our work includes a hitherto unavailable structure, "Covalent Organic Nanotubes (CONTs)," to the repertoire. Strong covalent bonds between C, N, and O imparts high thermal and chemical stability of CONTs. This novel bottom-up approach provides an edge over the carbon nanotubes (CNTs) in functionalization, synthetic conditions, and porosity. CONT-1 exhibits a BET surface area of 321 m2g-1. These exible CONTs intertwine with each other. The computational studies establish the role of solvent as the critical driving force for this type of convolution. Upon ultrasonication, the intertwined CONT-1 coil to form the toroidal superstructure.

Viscoelastic Covalent Organic Nanotube Fabric via Macroscopic Entanglement

“…Covalently linking organic building units by reticular chemistry has resulted in a versatile and accessible class of porous materials. − Porous crystalline structures can be made catalytic, conducting, permeable, and biocompatible using organic building units with defined chemical functionalities combined with controlled and selective synthesis. , We recently reported a design and its implementation to synthesize one-dimensional (1D) porous covalent organic nanotubes (CONTs) . CONTs are one-dimensional, porous, nanotubular frameworks constructed from organic building blocks via reticular chemistry.…”

“…4,5 We recently reported a design and its implementation to synthesize one-dimensional (1D) porous covalent organic nanotubes (CONTs). 6 CONTs are one-dimensional, porous, nanotubular frameworks constructed from organic building blocks via reticular chemistry. The precise orientation of the building units leads to the one-dimensional growth of nanotubes.…”

Dispersive 2D Triptycene-Based Crystalline Polymers: Influence of Regioisomerism on Crystallinity and Morphology

“… 44 − 46 Recently, the triptycene-based linkers were utilized to construct covalently bonded porous organic nanotubes (CONTs), wherein interesting self-assembly properties were observed. 48 There is only one example of crystalline 2D layered COF built with triptycene monomers that benefits from the superior reversibility of the boronate ester linkage. However, the limited persistence of these boronate ester-based materials hampers their potential for long-term utility.…”

“…In contrast, the use of triptycene-based building blocks to prepare highly crystalline COFs/CPs is rare. The successful examples usually require highly symmetric hexafunctionalized monomers and afford 3D COFs with diverse topologies. − For instance, Fang et al demonstrated that the use of triptycene-based building blocks could lead to 3D COFs with remarkable gas adsorption capabilities. − Recently, the triptycene-based linkers were utilized to construct covalently bonded porous organic nanotubes (CONTs), wherein interesting self-assembly properties were observed . There is only one example of crystalline 2D layered COF built with triptycene monomers that benefits from the superior reversibility of the boronate ester linkage.…”

A Crystalline 1D Dynamic Covalent Polymer

“…Dynamic covalent chemistry has shown great success in the solution synthesis of crystalline organic materials with different dimensionality, such as 1D, , 2D, , and 3D , covalent organic frameworks. Under dynamic covalent chemistry conditions, the covalent bonds between the monomers can be formed and broken; hence, any structural error can be corrected by thermodynamic control.…”