High solid-state fluorescence in ring-shaped AEE-active tetraphenylsilole derivatives.

Three ring-shaped AEE-active silole-containing compounds were synthesized by mild condensation reactions. Cyclotrisiloxane compound 1 displays high solid-state quantum yield (Φ_fl = 0.86) with the fluorescence maximum at 512 nm. This high fluorescence efficiency results mainly from decreased vibrational pathways to fluorescence decay due to the intramolecular C-H⋯π interactions. [ABSTRACT FROM AUTHOR]