π–π and σ–π Interactions in α,ω-Dinaphthyl and -Dianthryl Oligosilanes in Solution

Abstract

Abstract The π–π and σ–π interactions in α,ω-di-1-naphthyl and -di-9-anthryl oligosilanes [Np–(SiMe2)n–Np (1–4), Ant–(SiMe2)n–Ant (5–8), n = 1–4] were investigated in solution. In nonpolar solvents such as cyclohexane, a strong excimer fluorescence is observed, which indicates a strong π–π interaction. In a polar solvent (CH3CN), a charge-transfer (CT) emission is observed for 3 and 4 due to the σ–π interaction.