The electrochemical redox behaviour of alkyl bridged polythiophene derivatives poly(I,6-bis(3-thienyl-)hexane) and poly(I,12-bis(3-thienyl-)dodecane) are investigated by cyclic voltammetry and compared to poly((3-hexyl-)thiophene) and poly((3-dodecyl-)thiophene). In addition the thermal characteristics of these polymers are determined by differential scanning calorimetry. The polythiophene derivatives exhibit a temperature and time dependent redox behaviour.