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Thermally Induced Persistent Covalent-Organic Frameworks Radicals.
Gu, Qianfeng; Lu, Xiangqian; Chen, Cailing; Hu, Renjie; Wang, Xin; Sun, Guohan; Kang, Fangyuan; Yang, Jinglun; Wang, Xiang; Wu, Jinghang; Li, Yang Yang; Peng, Yung-Kang; Qin, Wei; Han, Yu; Liu, Xiaogang; Zhang, Qichun.
Affiliation
  • Gu Q; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Lu X; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
  • Chen C; Advanced Membranes and Porous Materials (AMPM) Center, Physical Science and Engineering Division, King Ab-dullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
  • Hu R; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
  • Wang X; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Sun G; Department of Chemistry, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Kang F; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Yang J; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Wang X; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Wu J; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Li YY; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Peng YK; Department of Chemistry, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
  • Qin W; School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
  • Han Y; Advanced Membranes and Porous Materials (AMPM) Center, Physical Science and Engineering Division, King Ab-dullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia.
  • Liu X; Department of Chemistry and the N.1 Institute for Health, National University of Singapore, Singapore 117543, Singapore.
  • Zhang Q; Department of Materials Science and Engineering, City University of Hong Kong, Tat Chee Avenue 83, Kowloon, Hong Kong SAR 999077, P. R. China.
ACS Nano ; 17(23): 23903-23912, 2023 Dec 12.
Article in En | MEDLINE | ID: mdl-38014811
Persistent covalent-organic framework (COF) radicals hold important applications in magnetics and spintronics; however, their facile synthesis remains a daunting challenge. Here, three p-phenylenediacetonitrile-based COFs (named CityU-4, CityU-5, and CityU-6) were synthesized. Upon heat treatment (250 °C for CityU-4 and CityU-5 or 220 °C for CityU-6), these frameworks were brought into their persistent radical forms (no obvious changes after at least one year), together with several observable factors, including color changes, red-shifted absorption, the appearance of electron spin resonance (ESR) signals, and detectable magnetic susceptibility. The theoretical simulation suggests that after heat treatment, lower total energy and nonzero spin density are two main factors to guarantee persistent COFs radicals and polarized spin distributions. This work provides an efficient method for the preparation of persistent COF radicals with promising potentials.
Key words

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: ACS Nano Year: 2023 Document type: Article Country of publication: Estados Unidos

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: ACS Nano Year: 2023 Document type: Article Country of publication: Estados Unidos