Revisiting Borylanilines: Unique Solid-State Structures and Insight into Photophysical Properties

The structure and photophysical properties of two known borylanilines, 4-(dimesitylboryl)­aniline (1) and 4-(dimesitylboryl)-3,5-dimethylaniline (2), have been investigated. 1 and 2 have similar donor and acceptor centers but differ in their molecular conformations. Compounds 1 and 2 have been structurally characterized, and they exhibit a rare form of intermolecular N–H- - -π electrostatic interactions. The structure and photophysical properties of 1 and 2 are discussed in the context of computational results.