Viscoelastic Covalent Organic Nanotube Fabric via Macroscopic Entanglement was written by Koner, Kalipada;Das, Susobhan;Mohata, Shibani;Duong, Nghia Tuan;Nishiyama, Yusuke;Kandambeth, Sharath;Karak, Suvendu;Reddy, C. Malla;Banerjee, Rahul. And the article was included in Journal of the American Chemical Society in 2022.Reference of 128-08-5 This article mentions the following:
Covalent organic nanotubes (CONTs) are one-dimensional porous frameworks constructed from organic building blocks via dynamic covalent chem. 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 3μm thickness. The TAT-BPy CONTs and TAT-BPy CONT fabric were characterized by solid-state one-dimensional (1D) 13C CP-MAS, two-dimensional (2D) 13C-1H correlation NMR, 2D 1H-1H DQ-SQ NMR, and 2D 14N-1H correlation NMR spectroscopy. The mechanism of fabric formation was established by using high-resolution transmission electron microscopy and SEM techniques. The as-synthesized viscoelastic TAT-BPy CONT fabric exhibits high mech. strength with a reduced modulus (Er) of 8 (±3) GPa and hardness (H) of 0.6 (±0.3) GPa. Interestingly, the viscoelastic fabric shows time-dependent elastic depth recovery up to 50-70%. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Reference of 128-08-5).
1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Reference of 128-08-5
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary