A Pentacoordinate Boron-Containing π‑Electron System with Cl–B–Cl Three-Center Four-Electron Bonds

Tricoordinate
boron-containing π-electron systems are an
attractive class of compounds with intense fluorescence and strong
electron-accepting properties. However, the impact of pentacoordination
of the boron atoms on their properties has not been determined. We
now disclose a B,B′-bis­(1,8-dichloro-9-anthryl)-substituted
9,10-dihydro-9,10-diboraanthracene as a new pentacoordinate organoboron
compound. In this skeleton, with the aid of the orthogonal arrangement
of the anthryl substituent, the B and Cl atoms can form a three-center
four-electron (3c–4e) Cl–B–Cl bond. The pentacoordination
of the boron atom significantly perturbs the electronic structure
and thereby the photophysical and electrochemical properties.