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Generation of Stable Radical Cations (Polarons) and Dications (Bipolarons) on Model Thiophene Oligomers

Published online by Cambridge University Press:  25 February 2011

Denis Fichou  and
Gilles Horowitz
Denis Fichou
Affiliation:
Laboratoire des Matériaux Moléculaires - C.N.R.S. - 2, rue Henry Dunant 94320 - Thiais, France
Gilles Horowitz
Affiliation:
Laboratoire des Matériaux Moléculaires - C.N.R.S. - 2, rue Henry Dunant 94320 - Thiais, France
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Abstract

Oxidative doping of individual thiophene oligomers nT (n = 3 to 6) with FeC13 in dilute CH2Cl2 solution generates the corresponding radical cations (polarons) nT+.. as evidenced by in-situ visible/near infrared absorption and electron spin resonance spectroscopies. The nT+. species in solution progressively precipitate as conducting (0′300K = 10−1−10−2 S/cm) and strongly paraaagnetic radical cation salts (g = 2.003, ΔHPP ∼ 4–8 G). The conductivity of the 6T+. salt is weakly temperature dependent, with an activation energy of 32 meV above 100 K and a tendency to level Dff at lower temperatures. In the case of the sexithienyl radical 6T+., further doping results in the quantitative conversion into the dication 6T++ (bipolaron).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 173: Symposium Q – Advanced Organic Solid State Materials , 1989 , 379
Copyright
Copyright © Materials Research Society 1990

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References

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