Polyelectrolytes are polymer-supported polyions that have found broad applications as dispersing agents, thickeners, water treatment, and among many others. Typically, polyelectrolytes contain common ionizable functional groups such as carboxylic acids and amines, but aromatic anions have rarely been investigated due to their instability. Herein, we successfully incorporated a stable aromatic anion moiety, tetracyanocyclopentadienide (TCCp<sup>-</sup>), onto a norbornene (Nb) structure. Following Ring Opening Metathesis Polymerization (ROMP), we report the development of the first type of polymers carrying stable aromatic anions along the polymer backbone, PNb-TCCp. The resulting polymers demonstrate high ionic conductivity in thin films and can serve as counter anions to effectively stabilize the doped poly(3,4-ethylenedioxythiophene) (PEDOT) to retain its electrical conductivity at high temperatures.

Tetracyanocyclopentadienide-based stable poly(aromatic) anions

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