Tridurylboranes Extended by Three Arylethynyl Groups as a New Family of Boron-Based π-Electron Systems

摘要

A series of tris(phenylethynylduryl)boranes (R-C_4H_4-C≡C-duryl)_3B with various substituents R have been prepared as air-stable solids owing to the steric protection of the boron atom by the three bulky duryl groups. These compounds show unique photophysical properties due to the p_π-π~* conjugation through the p-orbital on the boron atom. In particular, a push-pull type derivative with R = NMe_2 exhibits a significant solvatochromism of fluorescence from blue to orange colors.