Polypyrrole is a chemical compound formed from a number of connected pyrrole

Pyrrole

Pyrrole is a heterocyclic aromatic organic compound, a five-membered ring with the formula C4H4NH. It is a colourless volatile liquid that darkens readily upon exposure to air. Substituted derivatives are also called pyrroles, e.g., N-methylpyrrole, C4H4NCH3...

 ring structures. For example a tetrapyrrole is a compound with four pyrrole rings connected. Methine

Methine

In chemistry, methine is a trivalent functional group CH, derived formally from methane. The methine group consists of a carbon atom bound by two single bonds and one double bond, where one of the single bonds is to a hydrogen...

-bridged cyclic tetrapyrroles are called porphyrins. Polypyrroles are conducting polymers of the rigid-rod polymer host family, all basically derivatives of polyacetylene

Polyacetylene

Polyacetylene is an organic polymer with the repeat unit n. The high electrical conductivity discovered for these polymers beginning in the 1960's accelerated interest in the use of organic compounds in microelectronics...

. Polypyrrole was the first polyacetylene-derivative to show high conductivity.

In a series of papers in 1963, DE Weiss and coworkers reported high-conductivity (up to 1 S/cm) in iodine-doped oxidized polypyrrole.