A Self-Doped Ionic Conjugated Polymer: Poly(2-ethynylpyridinium-Nbenzoylsulfonate) by the Activated Polymerization of 2-Ethynylpyridine with Ring-Opening of 2-Sulfobenzoic Acid Cyclic Anhydride

Now, we report a very facile synthetic method of novel self-dopable ionic conjugated polymer, poly(2-ethynylpyridinium-N-benzoylsulfonate) (PEPBS), by the activated polymerization of 2-ethynylpyridine with the ring-opening of 2-sulfobenzoic acid cyclic anhydride without any additional initiator or catalyst. Electric conduction in organic solids has been one of the most fascinating topics for synthetic chemists and solid-state physics.5 Various polyacetylene-based conjugated polymers have been prepared by the simple linear polymerization of the corresponding acetylene monomers by various catalyst systems. Due to their extensive conjugation and ionic nature, these ionic polyacetylenes have potentials as materials for mixed ionic and electronic conductivity, energy storage devices such as batteries, permselective membrane, and light-emitting devices