title: The solid-state organization of 'self-doped' PPV oligomers.
abstract: Using a combination of multi-frequency EPR and NMR spectroscopy and quantum-chemical calculations at the level of Density Functional Theory (DFT), the organization of self-doped PPV oligomers in their solid state is investigated. The analysis of the different spectra shows that the electrochemical procedure used to self-dope these materials produces positive radicals (polarons) in an almost quantitative way, but still magnetically isolated polarons are observed. The difference between chemical and electrochemical oxidation of the oligomers is studied in detail. Furthermore, ageing of the electrochemically oxidized oligomers may be accompanied by a stacking of the oligomers.
authors.affiliation: University of Antwerp, Department of Physics, Universiteitsplein 1, B-2610 Antwerp, Wilrijk, Belgium.
authors.forename: Yun
authors.initials: Y
authors.lastname: Ling
authors.forename: Piotr
authors.initials: P
authors.lastname: Kozakiewicz
authors.forename: Frank
authors.initials: F
authors.lastname: Blockhuys
authors.forename: Monique
authors.initials: M
authors.lastname: Biesemans
authors.forename: Christian
authors.initials: C
authors.lastname: Van Alsenoy
authors.forename: Hans
authors.initials: H
authors.lastname: Moons
authors.forename: Etienne
authors.initials: E
authors.lastname: Goovaerts
authors.forename: Rudolph
authors.initials: R
authors.lastname: Willem
authors.forename: Sabine
authors.initials: S
authors.lastname: Van Doorslaer