One-Step Access to Luminescent Pentaaryldiazaboroles via C–C Double Bond Formation from Imidoylstannanes

A series of pentaaryl-substituted diaza­boroles
have been
prepared for the first time by a novel strategy based on the C–C
double bond formation from imidoylstannane reagents in the presence
of dibromo­phenyl­boranes. The aryl substituents on the
4,5-position of the planar C2N2B core have substantial
effects on their electronic structures. All the new diazaboroles are
luminescent both in solution and in the solid state. DFT calculations
indicate the 4,5-C-aryl substituents have significant
contributions to the LUMOs.