Koner Kalipada, Das Susobhan, Mohata Shibani, Duong Nghia Tuan, Nishiyama Yusuke, Kandambeth Sharath, Karak Suvendu, Reddy C Malla, Banerjee Rahul
Department of Chemical Sciences, Indian Institute of Science Education and Research, Mohanpur, Kolkata 741246, India.
Centre for Advanced Functional Materials, Indian Institute of Science Education and Research, Mohanpur, Kolkata 741246, India.
J Am Chem Soc. 2022 Sep 7;144(35):16052-16059. doi: 10.1021/jacs.2c06133. Epub 2022 Aug 23.
Covalent organic nanotubes (CONTs) are one-dimensional porous frameworks constructed from organic building blocks via dynamic covalent chemistry. CONTs are synthesized as insoluble powder that restricts their potential applications. The judicious selection of 2,2'-bipyridine-5,5'-dicarbaldehyde and tetraaminotriptycene as building blocks for TAT-BPy CONTs has led to constructing flexible yet robust and self-standing fabric up to 3 μm thickness. The TAT-BPy CONTs and TAT-BPy CONT fabric have been characterized by solid-state one-dimensional (1D) C CP-MAS, two-dimensional (2D) C-H correlation NMR, 2D H-H DQ-SQ NMR, and 2D N-H correlation NMR spectroscopy. The mechanism of fabric formation has been established by using high-resolution transmission electron microscopy and scanning electron microscopy techniques. The as-synthesized viscoelastic TAT-BPy CONT fabric exhibits high mechanical strength with a reduced modulus () of 8 (±3) GPa and hardness () of 0.6 (±0.3) GPa. Interestingly, the viscoelastic fabric shows time-dependent elastic depth recovery up to 50-70%.
