Are the Accompanying Cations of Doping Anions Influential in Conducting Organic Polymers? The Case of the Popular PEDOT

[EN] Conducting organic polymers (COPs) are made of a conjugated polymer backbone supporting a certain degree of oxidation. These positive charges are compensated by the doping anions that are introduced into the polymer synthesis along with their accompanying cations. In this work, the influence of these cations on the stoichiometry and physicochemical properties of the resulting COPs have been investigated, something that has previously been overlooked, but, as here proven, is highly relevant. As the doping anion, metallacarborane Co(C2B9H11)(2) was chosen, which acts as a thistle. This anion binds to the accompanying cation with a distinct strength. If the binding strength is weak, the doping anion is more prone to compensate the positive charge of the polymer, and the opposite is also true. Thus, the ability of the doping anion to compensate the positive charges of the polymer can be tuned, and this determines the stoichiometry of the polymer. As the polymer, PEDOT was studied, whereas Cs+, Na+, K+, Li+, and H+ as cations. Notably, with the Co(C2B9H11)(2) anions, these cations are grouped into two sets, Cs+ and H+ in one and Na+, K+, and Li+ in the second, according to the stoichiometry of the COPs: 2:1 EDOT/Co(C2B9H11)(2) for Cs+ and H+, and 3:1 EDOT/Co(C2B9H11)(2) for Na+, K+, and Li+. The distinct stoichiometries are manifested in the physicochemical properties of the COPs, namely in the electrochemical response, electronic conductivity, ionic conductivity, and capacitance.

"This is the peer reviewed version of the following article: I. Fuentes, M. J. Mostazo-López, Z. Kelemen, V. Compañ, A. Andrio, E. Morallón, D. Cazorla-Amorós, C. Viñas, F. Teixidor, Chem. Eur. J. 2019, 25, 14308. , which has been published in final form at ttps://doi.org/10.1002/chem.201902708. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving."