Preparation of Poly(3-alkoxythiophene-2,5-diyl)s by Organometallic Process and Doping-Undoping Behaviors of the Polymers

Abstract
Poly(thiophene-2,5-diyl) derivatives having alkoxy substituents at 3-positions are synthesized by dehalogenation polycondensation of the corresponding 2,5-dibromothiophene derivatives with zero-valent nickel complex. The obtained polymers show not only usual p-type doping and undoping behaviors but also unique n-type doping and undoping behaviors due to the stabilization of n-doped state by interaction between dopant cation and ethereal oxygen.