4.8 Article

[4]Triangulenes Modified by Three Oxygen-Boron-Oxygen (OBO) Units: Synthesis, Characterizations, and Anti-Kasha Emissions

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 43, Pages 10085-10091

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c02986

Keywords

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Funding

  1. National Natural Science Foundation of China
  2. Northwestern Polytechnical University
  3. Fundamental Research Funds for the Central Universities
  4. [22001211]

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In this research, a facile synthesis method was developed to modify the structure of [4]triangulene by replacing its carbon edges with oxygen-boron-oxygen units. The resulting compounds, termed OBO-modified [4]triangulenes, exhibited excellent thermal stability and rare fluorescence and phosphorescence emissions from multiple higher excited states.
Modification of pi-conjugated systems using a boron atom as the dopant has become a powerful approach to create new structures and new properties. Herein, we report a facile synthesis of replacing the carbon edges of [4]triangulene by three oxygen-boron-oxygen (OBO) units. The OBO-modified [4]triangulenes are structurally similar to [4]triangulene and isoelectronic to the trianion of [4]triangulene. The structure of OBO-modified [4]triangulene is confirmed by single-crystal X-ray diffraction analysis, revealing an off-plane core with three edge-modified OBO units. These OBO-modified [4]triangulenes exhibit excellent thermal stability. These compounds have phosphorescence with lifetime longer than 1 s at 77 K. Both theoretical calculations and photophysical investigation of OBO-modified [4]triangulenes indicate that this kind of molecules display a rare anti-Kasha fluorescence and phosphorescence emissions from multiple higher excited states.

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