title: Extensive quinoidal oligothiophenes with dicyanomethylene groups at terminal positions as highly amphoteric redox molecules.
abstract: A series of highly extensive quinoidal oligothiophenes carrying a dicyanomethylene group at both terminal positions is synthesized. As the quinoidal structures extend, they have highly amphoteric abilities and show strong electronic absorptions in the visible to near-infrared region. The higher homologues, quinquethiophene and sexithiophene, exist as equilibrium mixtures with the biradical species.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan.
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Takahashi
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Matsuoka
authors.forename: Kazuo
authors.initials: K
authors.lastname: Takimiya
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Otsubo
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Aso
mesh_terms: D008697:Methane / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry; D010084:Oxidation-Reduction; D011809:Quinones / Q000138:chemical synthesis* / Q000737:chemistry; D013876:Thiophenes / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D009570:Nitriles; D011809:Quinones; D013876:Thiophenes; D008697:Methane