Evidence for counterion complexation in the conducting state of viologen-functionalized poly (3-alkylthiophenes)

✍ Scribed by N.S. Sariciftci; A.C. Kolbert; M. Mehring; K.U. Gaudl; P. Bäuerle; H. Neugebauer; A. Neckel

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 378 KB
• Volume: 182
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(91)80223-k

✦ Synopsis

Results of in situ electron-paramagnetic resonance, optical absorption, Fourier-transform-infrared spectroscopy during electrochemical doping and undoping processes, as well as solid-state 'H NMR relaxation studies in the doped and undoped form of viologen-functionalized poly(3-alkylthiophenes) are reported. Effects of the viologen side group on the electronic properties of the polythiophene backbone in its conducting state are observed. Experimental results are discussed in terms of localization of charge carriers on the polythiophene backbone. Considering the NMR relaxation data, we propose a structural model with counterion complexation between the polymer backbone and the viologen side group.