Preparation of new n-type conducting poly(arylene)s by organometallic process and their electrical and optical properties

N-type conducting poly(arylene)s, poly(quinoline-2,6-diyl) (P(2,6-Q)), poly(quinoxaline-2,6-diyl) (P(2,6-Qx)), and (poly(1,5-naphthyridine-2,6-diyl) (P(2,6-N)), have been synthesized by using nickel complex. These polymers have 2,6-naphthylene-like units with imine nitrogen(s) and have more extended π-conjugation system as well as higher electron-accepting properties than their isomeric poly(quinoline-5,8-diyl) and poly(quinoxline-5,8-diyl), revealing that the 2,6-naphthylene-like bonding between the monomer units is especially suitable for the extensive π-conjugation.