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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

REFERENCES

[1](a)Chung, T.-C., Kaufman, J.H., Heeger, A.J. and Vudl, F., Phys. Rev. B 30, 702 (1984).CrossRefGoogle Scholar
(b)Kaneto, K., Kohno, Y. and Yoshino, K.,. Mol, Cryst. Liq. Cryst. 118, 217 (1985).CrossRefGoogle Scholar
[2] Bertho, D. and Jouanin, C., Phys. Rev. B 35, 626 (1987).CrossRefGoogle Scholar
[3] Stafström, S. and Brédas, J.L., Phys. Rev. B 38, 4180 (1988).Google Scholar
[4](a)Fichou, D., Horowitz, G. and Gamier, F., in press,Google Scholar
(b) Xu, Z., Fichou, D., Horowitz, G. and Gamier, F., J. Electroanal. Chem. 267, 339 (1989).CrossRefGoogle Scholar
[5](a)Fichou, D., Garnier, F., Charra, F., Kajzar, F. and Messier, J., in “Organic Materials for Nonlinear Optics”, eds. Hahn, R. and Bloor, D, Royal Society of Chemistry, London, pp.176 (1989).Google Scholar
[6](a)Horowitz, G., Fichou, D. and Garnier, F., Solid State Commun. 70, 385 (1989).Google Scholar
(b)Horowitz, G., Fichou, D., Peng, X., Xu, Z. and Garnier, F., Solid State Commun., in press.Google Scholar
[7](a)Kagan, J. and Arora, S., Heterocycles, 20, 1937 (1983).Google Scholar
(b)Kagan, J. and Arora, S., Tetrahedron Lett., 24, 4043 (1983).CrossRefGoogle Scholar
[8] Vincow, G., in “Radical Ions”, eds. Kaiser, E.T. and Kevan, L., (Interscience, New-York, 1968), pp. 151.Google Scholar