Multifrequency EPR analysis of the positive polaron in I2-doped poly(3-hexylthiophene) and in poly[2-methoxy-5-(3,7-dimethyloctyloxy)]-1,4- phenylenevinylene

Aránzazu Aguirre, Peter Gast, Sergey Orlinskii, Ikuko Akimoto, Edgar J.J. Groenen, Hassane El Mkami, Etienne Goovaerts, Sabine Van Doorslaer*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

70 Citations (Scopus)

Abstract

The W-band continuous-wave electron paramagnetic resonance (EPR) analysis of chemically induced polarons in drop-cast and spin-coated polyphenylenevinylene-type and polythiophene-type polymer films reveals rhombic g tensors in both cases. The dependence of the W-band EPR signals on the orientation of the spin-coated films with respect to the magnetic field indicates a high degree of backbone alignment with the substrate and allows a partial assignment of the g tensor orientation. The derived molecular orientations of the polymer chains in the spin-coated films show clear differences between the two types of polymers. The proton hyperfine interactions obtained from X-band HYSCORE (hyperfine sublevel correlation) and Q- and W-band pulsed ENDOR (electron-nuclear double resonance) experiments are interpreted in terms of earlier theoretical studies on the extension of the polarons.

Original languageEnglish
Pages (from-to)7129-7138
Number of pages10
JournalPhysical Chemistry Chemical Physics
Volume10
Issue number47
DOIs
Publication statusPublished - 8 Dec 2008

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