Abstract
Anthracene-substituted triarylboranes have been widely studied as optoelectronic materials because of their unique photophysical properties. In this work, we synthesized new anthryl-substituted boranes with a seven-membered aromatic ring system, so-called borepin. The anthryl-substituted tetracyclic borepins exhibited limited electronic interaction between the borepin structure and the anthryl group in the ground state, whereas their fluorescence spectra were obviously different from those of mesityl-substituted systems. Notably, the fluorescence was enhanced when fluoride was added to the borepin solution by the coordination of fluoride to the boron center.
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