Fractionated regioregular poly(3-hexylthiophene). Spectroscopic and electrochemical studies

Regioregular poly(3-hexylthiophene) was obtained and fractionated into four fractions of different molecular weights (Mn) exhibiting low polydispersity coefficients. UV-VIS spectra confirm the increase of average conjugation length with the increase of the Mn of fractions. Voltammetric curves of fractions corroborate UV-VIS results and show that the contribution of poorly conjugated segments decrease with the Mn