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cis and trans Forms of Near-Infrared Diazaborepin Frameworks with Two Tetracoordinate Boron Atoms
Lingjuan Chen1, Jiaqi Dong1, Xueguang Liu1
1Xi'an Key Laboratory of Hybrid Luminescent Materials and Photonic Device, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China.
Abstract:
π-Conjugated frameworks cis-BN2h with two diazaborepin moieties and trans-BN2h1 with only one diazaborepin moiety were synthesized via borylation followed by the Scholl reaction. The cis and trans configurations of the substituent on two tetracoordinate boron atoms were controlled by adjusting the reaction solvent, temperature, and concentration. Both molecules exhibit broad absorption across the visible-near-infrared region up to 722 nm. The diazaborepin core is found to enhance electron delocalization and σ-π hyperconjugation, which increase the HOMO energy with a smaller optical bandgap.
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