Influence of polarity of the medium in the saturation of the electronic properties for π-conjugated oligothiophenes

► Environmental forces affect considerably the ionization potentials of poly(thiophene)s. ► Extrapolation from oligothiophenes to poly(thiophene)s using a third-order polynomial allows consider saturation effects. ► Geometry relaxation in the corresponding medium is crucial to describe the electronic properties in such environment. ► The effect of the medium in the electronic properties of poly(thiophene)s largely depends on their chemical structures.