A Pentacoordinate Boron-Containing pi-Electron System with CI-B-CI Three-Center Four-Electron Bonds

作者：Dou Chuandong; Saito Shohei; Yamaguchi Shigehiro^*

来源：Journal of the American Chemical Society, 2013, 135(25): 9346-9349.

DOI：10.1021/ja404724f

Tricoordinate boron-containing pi-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%26apos;-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.

• 出版日期2013-6-26