Physical properties of polypyrrole films containing tetracyanonickelate( II ) anions, PPy–Ni(CN) 4

Polypyrrole–tetracyanonickelate, PPy–Ni(CN)4, has been synthesized in thin-film form by electrochemical oxidation of pyrrole in aqueous or non-aqueous media. The room-temperature electrical conductivity of one of the films (122 S cm–1) is the highest reported to date for any PPy–metal anion system. The temperature dependence of the conductivity is consistent with the Mott variable-range hopping model. Some of the films show good stability in air at room temperature, their conductivity decreasing by less than 7% over 50 days.