Abstract
The development of disilane-bridged donor–acceptor–donor (D-Si-Si-A-Si-Si-D) and acceptor–donor–acceptor (A-Si-Si-D-Si-Si-A) compounds is described. Both types of compound showed strong emission (λem=ca. 500 and ca. 400 nm, respectively) in the solid state with high quantum yields (Φ: up to 0.85). Compound 4 exhibited aggregation-induced emission enhancement in solution. X-ray diffraction revealed that the crystal structures of 2, 4, and 12 had no intermolecular π–π interactions to suppress the nonradiative transition in the solid state.
Disilane-bridged donor–acceptor–donor (D-Si-Si-A-Si-Si-D) molecules and acceptor–donor–acceptor (A-Si-Si-D-Si-Si-A) compounds display strong solid-state emission (see picture) and aggregation-induced emission (AIE). X-ray diffraction reveals there is no π–π stacking in crystals to suppress intermolecular interaction.