Hexacyano-[3]-radialene anion-radical salts: a promising family of highly soluble p-dopantsElectronic supplementary information (ESI) available: Synthesis of the dopants, cyclic voltammetry, thermal, X-ray, and microscopy data. See DOI: 10.1039/c7cc08671g

Organic and inorganic salts of the hexacyano-[3]-radialene anion-radical are readily available and thermally stable compounds (up to ∼180 °C). The tetrabutylammonium salt exhibits an extremely high solubility in a range of solvents (>300 mg l −1 in CHCl 3 ) and acts as an efficient p-dopant for poly(3-hexylthiophene) to provide composite films with a conductivity above 2 S cm −1 . A versatile approach to a family of thermally stable, efficient anion-radical p-dopants having a tunable solubility is developed.