Title: Magnetic Properties of Substituted Poly(thiophene)s in Their Neutral State
Authors: Vandeleene, Steven ×
Jivanescu, Mihaela
Stesmans, Andre
Cuppens, Jo
Van Bael, Margriet
Yamada, Hitoshi
Sato, Norio
Verbiest, Thierry
Koeckelberghs, Guy #
Issue Date: Mar-2010
Publisher: Amer chemical soc
Series Title: Macromolecules vol:43 issue:6 pages:2910-2915
Abstract: The magnetic behavior of undoped (neutral), substituted poly(thiophene)s is reported. In particular, the influence of the nature of the substituent (alkyl, alkoxy, thioalkyl), the substitution pattern (head-to-tail (HT) versus head-to-head-tail-to-tail (HH-TT)), and the regioregularity oil the magnetic properties has been investigated. ESR spectroscopy reveals that the nature of the substituent determines the spin density, while the line width and asymmetry of the ESR signals are mainly governed by the substitution pattern and regioregularity. The spins give rise to a paramagnetic behavior. SQUID magnetometry reveals the presence of superparamagnetic order at room temperature, while ferromagnetism is observed at 5 K. The magnetic behavior observed by SQUID magnetometry does not (solely) originate front the ESR-active spin system. Its strength does therefore not depend on the ESR spin density, but seems to be governed by the supramolecular structure.
ISSN: 0024-9297
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Solid State Physics and Magnetism Section
Semiconductor Physics Section
Polymer Chemistry and Materials
× corresponding author
# (joint) last author

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