Electron-Deficient Polycyclic π‑System Fused with Multiple B←N Coordinate Bonds
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An extensive polycyclic π-system with 23 fused rings is synthesized via a highly efficient borylation reaction, in which four B-N covalent bonds and four B←N coordinate bonds are formed in one pot. B←N coordinate bonds not only lock the backbone into a near-coplanar conformation but also decrease the LUMO energy level to around -3.82 eV, demonstrating the dual utility of this strategy for the synthesis of extensive rigid polycyclic molecules and the development of n-type conjugated materials for organic electronics and organic photovoltaics.
author list (cited authors)
Cao, Y., Zhu, C., Barłóg, M., Barker, K. P., Ji, X., Kalin, A. J., Al-Hashimi, M., & Fang, L.