| Autor: |
Lakshmi, Vellanki, Liu, Cheng-Hao, Rajeswara Rao, Malakalapalli, Chen, Yulan, Fang, Yuan, Dadvand, Afshin, Hamzehpoor, Ehsan, Sakai-Otsuka, Yoko, Stein, Robin S., Perepichka, Dmitrii F. |
| Zdroj: |
Journal of the American Chemical Society; February 2020, Vol. 142 Issue: 5 p2155-2160, 6p |
| Abstrakt: |
The black crystalline (aza)triangulene-based covalent organic framework TANG-COFwas synthesized from its trinitro-TANG precursor via a one-pot, two-step reaction involving Pd-catalyzed hydrogenation and polycondensation with an aromatic dialdehyde. High crystallinity and permanent porosity of the layered two-dimensional (2D) structure were established. The rigid, electron-rich trioxaazatriangulene (TANG) building block enables strong π-electron interactions manifested in broad absorptions across the visible and NIR regions (Eg≈ 1.2 eV). The high HOMO energy of TANG-COF(−4.8 eV) enables facile p doping, resulting in electrical conductivity of up to 10–2S/cm and room-temperature paramagnetic behavior with a spin concentration of ∼10%. DFT calculations reveal dispersion of the highest occupied band both within the 2D polymer layers (0.28 eV) and along their π-stacked direction (0.95 eV). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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