4.8 Article

Access to tetracoordinate boron-doped polycyclic aromatic hydrocarbons with delayed fluorescence and aggregation-induced emission under mild conditions

Journal

CHEMICAL SCIENCE
Volume 13, Issue 19, Pages 5597-5605

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2sc01722a

Keywords

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Funding

  1. National Natural Science Foundation of China [22001211]
  2. Northwestern Polytechnical University
  3. Shaanxi Key Laboratory of Special Fuel Chemistry and Material [SPCF-SKL-2021-0014]
  4. Fundamental Research Funds for the Central Universities

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Boron-doped polycyclic aromatic hydrocarbons (PAHs) have unique optical and redox properties, making them attractive in the field of optoelectronic materials. A facile approach to four-coordinate boron-doped PAHs was developed in this study, which does not require high temperature and pre-synthesized functionalized boron reactants. The investigation of these compounds revealed distinct photophysical properties compared to their three-coordinate boron-doped counterparts.
Boron-doped polycyclic aromatic hydrocarbons (PAHs) have attracted ongoing attention in the field of optoelectronic materials due to their unique optical and redox properties. To investigate the effect of tetracoordinate boron in PAHs bearing N-heterocycles (indole and carbazole), a facile approach to fourcoordinate boron-doped PAHs was developed, which does not require elevated temperature and pre-synthesized functionalized boron reactants. Five tetracoordinate boron-doped PAHs (NBNN-1-NBNN-5) were synthesized with different functional groups. Two of them (NBNN-1 and NBNN-2) could further undergo oxidative coupling reactions to form fused off-plane tetracoordinate boron-doped PAHs NBNN-1f and NBNN-2f. The investigation of photophysical properties showed that the UV/vis absorption and fluorescence emission are significantly red-shifted compared to those of the three-coordinate boron-doped counterparts. In addition, the emission of NBNN-1-NBNN-3 consisted of prompt fluorescence and delayed fluorescence. The compounds NBNN-1f and NBNN-2f showed aggregation-induced emission.

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