Electrochemical, magnetic and electrical properties of a,w-capped sexithiophene films. Part 2. Conduction in Sexithiophenes with a,w-Aryl-Extended Conjugation (Articolo in rivista)

Type
Label
  • Electrochemical, magnetic and electrical properties of a,w-capped sexithiophene films. Part 2. Conduction in Sexithiophenes with a,w-Aryl-Extended Conjugation (Articolo in rivista) (literal)
Anno
  • 2006-01-01T00:00:00+01:00 (literal)
Alternative label
  • Zotti G., Zecchin S., Vercelli B., Pasini M., Destri S., Bertini F., Berlin A. (2006)
    Electrochemical, magnetic and electrical properties of a,w-capped sexithiophene films. Part 2. Conduction in Sexithiophenes with a,w-Aryl-Extended Conjugation
    in Chemistry of materials
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Zotti G., Zecchin S., Vercelli B., Pasini M., Destri S., Bertini F., Berlin A. (literal)
Pagina inizio
  • 3151 (literal)
Pagina fine
  • 3161 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 18 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Titolo
  • Electrochemical, magnetic and electrical properties of a,w-capped sexithiophene films. Part 2. Conduction in Sexithiophenes with a,w-Aryl-Extended Conjugation (literal)
Abstract
  • Thin films of tetrahexyl-sexithiophenes, fluorenonyl- and fluorenyl-protected at the terminal a,w-positions, were investigated by cyclic voltammetry, EQCM, in-situ ESR and in-situ conductivity. Reversible oxidation is composed by three separate steps, two one-electron and a further multilelectron processes. ESR indicates strong magnetic dimerization for the one-electron oxidized species. Conductivity is redox type at the cation-dication (polaron-bipolaron) state and metal-like at doping levels higher than the bipolaron with a 20-fold increase at full oxidation. Hexyl-substitutedƒn a,w-capped octathiophene, decathiophene and dodecathiophene films have been similarly investigated to compare the effects of fluorenonyl- and fluorenyl-extension of sexithiophene with that given by additional thiophene rings. The conductivity, which increases progressively (by 3 orders of magnitude) with the oligothiophene chain length, is metal-like. In dodecathiophene the doping charge increases markedly approaching four electrons per molecule and conductivity, maximized at the two-electron level, decreases linearly approaching zero at the four-electron level. A bipolaron model of conductivity accounts for conductivity in oligothiophenes. (literal)
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