Synthesis and optical properties of π-conjugated push-pull dyes incorporating a functionalized benzo[1,2-b:3,4-b′]difuran spacer

The synthesis of a series of push-pull dyes incorporating a functionalized benzo[1,2-b:3,4-b']difuran moiety acting as a conjugated spacer is reported. The studies of their optical properties evidenced a strong ICT upon photoexcitation. As a consequence of their highly polarized nature, these dyes all display a sizeable solvatochromic emission. One example has been further incorporated onto a BODIPY fluorophore leading to a highly conjugated molecular scaffold.