Optical, electrochemical, magnetic, and conductive properties of new poly (indolocarbazole-alt-bithiophene)s

New alternating copolymers based on indolocarbazole (IC), both two-and three-coupled, and bithiophene (BT) or bis(3,4-ethylenedioxythiophene) (BiEDOT), were obtained using Stille or Suzuki coupling reactions. Those copolymers have been investigated by cyclic voltammetry, electrochemical quartz crystal microbalance, in situ electron spin resonance, in situ conductivity, and UV-Vis-NIR spectro-electrochemistry techniques. All polymer films undergo reversible oxidation processes. One to three isoelectronic oxidation processes, involving one electron per repeat unit, produce radical cations, dications, and radical trications. The oxidative charge is localized in the IC moiety for BT copolymers or over the whole polyconjugated backbone for BiEDOT copolymers. Redox neutral-polaron conductivities are in the ran-e of 0.02-0.1 S.cm(-1) and polaron-bipolaron conductivities in the range of 0.1-0.7 S.cm(-1).