Ferromagnetic spins interaction in alternating branched polyarylamines

Ferromagnetic spins interaction in alternating branched polyarylamines

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 techniqu...

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Veröffentlicht in:Journal of applied physics 2011-04, Vol.109 (7), p.074911-074911-6
Hauptverfasser: Gosk, Jacek, Maurel, Vincent, Gambarelli, Serge, Djurado, David, Szymczak, Rita, Twardowski, Andrzej, Kulszewicz-Bajer, Irena
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container_end_page 074911-6
container_issue 7
container_start_page 074911
container_title Journal of applied physics
container_volume 109
creator Gosk, Jacek
Maurel, Vincent
Gambarelli, Serge
Djurado, David
Szymczak, Rita
Twardowski, Andrzej
Kulszewicz-Bajer, Irena
description 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.
doi_str_mv 10.1063/1.3553882
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title Ferromagnetic spins interaction in alternating branched polyarylamines
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