title: Polycyclic π-electron system with boron at its center.
abstract: We disclose a new planarized triarylborane in which the tri-coordinated boron atom is embedded in a fully fused polycyclic π-conjugated skeleton. The compound shows high stability toward oxygen, water, and silica gel, despite the absence of steric protection around the B atom. Reflecting the electron-donating character of the π-skeleton and the electron-accepting character of the B atom, this compound shows broad absorption bands that cover the entire visible region and a fluorescence in the visible/near-IR region. In addition, this compound shows dramatic property changes upon formation of a tetra-coordinated borate, such as thermochromic behavior in the presence of pyridine.
authors.affiliation: Department of Chemistry, Graduate School of Science, Nagoya University, Furo, Chikusa, Japan. s_saito@chem.nagoya-u.ac.jp
authors.forename: Shohei
authors.initials: S
authors.lastname: Saito
authors.forename: Kyohei
authors.initials: K
authors.lastname: Matsuo
authors.forename: Shigehiro
authors.initials: S
authors.lastname: Yamaguchi