Before revision: The monomer repeat unit of unsubstituted polythiophene.Polythiophenes demonstrate interesting optical properties resulting from their conjugated backbone, as demonstrated by the fluorescence of a substituted polythiophene solution under UV irradiation.Space-filling model of poly(3-butylthiophene) from the crystal structure .
After revision: AFM image of poly(3-decylthiophene-2,5-diyl) on hexagonal boron nitride (top-right inset) .