Synthesis and characterization of γ-lactone-Pechmann dye based donor-acceptor conjugated polymers

• γ-lactone-Pechmann dye as electron acceptor was first introduced to D-A polymers.
• D-A polymers with narrow bandgaps and deeper LUMO levels are synthesized.
• Side chains affect intermolecular aggregation and charge transport in devices.

A new acceptor moiety, γ-lactone-Pechmann dye is synthesized and used in the construction of two new conjugated D-A polymers. The optical and electrochemical characterization shows a broad absorption band extended to 1000 nm and narrow band gaps with deep LUMO energy levels. The chemical structures of the side chains appended from the donor units affect the intermolecular aggregation and the charge transport in thin-film field-effect transistors. The high degree of planarity, low bandgap, and strong electron accepting properties could make γ-lactone-Pechmann dye as a good candidate for the construction of conjugated D-A polymers.

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