Poly(9,10-anthryleneethynylene)-based polyradicals with pendant phenoxyls

We synthesized monomers of poly(9,10-anthryleneethynylene)s which were anthracene derivatives substituted with one or two phenol residues at the beta -position which would receive less steric hindrance from the poly(9,10-anthryleneethynylene) backbone. The monomers were polymerized by Pd(0) catalyst to give the corresponding precursor polymer with (M) over bar (W) similar to 10(4). The polyradicals were synthesized by oxidation of the hydroxyl group. The clearer hyperfine structure of the corresponding monomeric radicals suggested that the polyradicals probably also involved an effectively delocalized spin density distribution into the anthryleneethynylene skeleton. Diradical models for the poly(9, 10-anthryleneethynylene)-based polyradicals were also synthesized, and the magnetic properties of diradicals suggested defect insensitive strong ferromagnetic spin coupling of the corresponding polyradicals. (C) 2001 Elsevier Science Ltd. All rights reserved.