期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 9, 页码 4833-4840出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013692
关键词
boroles; dual fluorescence; equilibrium; tetramers; weak intermolecular coordination
资金
- China Scholarship Council
- Deutsche Forschungsgemeinschaft (DFG) [GRK 2112, MA 4471/8-1]
- Bavarian State Ministry of Science, Research, and the Arts under the Collaborative Research Network Solar Technologies go Hybrid
- Julius-Maximilians-Universitat Wurzburg
- Projekt DEAL
In this study, electron-poor phenylpyridyl-fused boroles were prepared using 4-phenylpyridine or 2-phenylpyridine instead of biphenyl. The boroles exhibited unique coordination modes and different properties in solid state and solution. The enhanced electron-accepting ability of the borole species with pyridyl group was demonstrated through theoretical and experimental investigations.
Using 4-phenylpyridine or 2-phenylpyridine in place of biphenyl, two electron-poor phenylpyridyl-fused boroles, [TipPBB1](4) and TipPBB2 were prepared. [TipPBB1](4) adopts a unique coordination mode and forms a tetramer with a cavity in both the solid state and solution. The boron center of TipPBB2 is 4-coordinate in the solid state but the system dissociates in solution, leading to 3-coordinate borole species. Compared to its borafluorene analogues, the electron-accepting ability of TipPBB2 is largely enhanced by the pyridyl group. TipPBB2 exhibits dual fluorescence in solution due to an equilibrium between free TipPBB2 and a weak intermolecular coordination adduct with a second molecule. This equilibrium was further investigated by low-temperature NMR spectroscopy and photophysical studies. Theoretical studies indicate that the highest occupied molecular orbital (HOMO) of TipPBB2 localizes at the Tip group, in contrast to its borafluorene derivatives, wherein the HOMOs are localized on the borafluorene cores.
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