1. Ferromagnetic spins interaction in alternating branched polyarylamines.
- Author
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Gosk, Jacek, Maurel, Vincent, Gambarelli, Serge, Djurado, David, Szymczak, Rita, Twardowski, Andrzej, and Kulszewicz-Bajer, Irena
- Subjects
AROMATIC amines ,OXIDATION ,FERROMAGNETISM ,RADICAL cations ,INFRARED spectra ,MAGNETIZATION - Abstract
The chemical oxidation of alternating branched polyarylamines leads to the formation of radical cations, the presence of which was manifested by the appearance of new bands in the UV-visible-near infrared spectra. Spins of radical cations can be magnetically coupled. The nutation pulsed-EPR technique was used to determine the multiplicity of spin systems for different oxidant:polymer unit ratios. It was found that spins of polymers oxidized to a radical cation in each conjugated amine segment interact magnetically to form dominant quartet state (S = 3/2). Magnetization measurements confirmed the ferromagnetic interaction of spins, returning an exchange integral J = +0.75 meV. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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