Boron-introduced aromatic systems have caught the interest of materials chemists because of their unique photophysical properties and tunable Lewis acidity. In this work, we have prepared boron-incorporated analogues of tetrathienoanthracene (TTA) containing aromatic borepin rings. Despite the low aromaticity of the borepin rings, the bisborepins showed high chemical stability and no decomposition in air. Interestingly, the bisborepins exhibited bluish fluorescence at room temperature and bright greenish phosphorescence at a low temperature. The specific electronic structure of the boronincorporated analogues of TTA was revealed by comparing the photophysical properties of the bis-borepins with those of TTA and the parent mono-borepin. The electronic structure was further investigated by DFT/TD-DFT calculations. Titration experiments using cyanide as the anion revealed the high Lewis acidity and the turn-off fluorescence response of the bis-borepins to the addition of cyanide.
Among conjugated materials, the p-π* conjugated polymers have attracted much attention due to their unique electronic structures derived from the orbital interaction between the empty p-orbital on boron and the...
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