1. Tuning of FerromagneticSpin Interactions in PolymericAromatic Amines via Modification of Their π-ConjugatedSystem.
- Author
-
Dobrzyńska, Ewelina, Jouni, Mohammad, Gawryś, Paweł, Gambarelli, Serge, Mouesca, Jean-Marie, Djurado, David, Dubois, Lionel, Wielgus, Ireneusz, Maurel, Vincent, and Kulszewicz-Bajer, Irena
- Subjects
- *
FERROMAGNETISM , *SPINTRONICS , *AROMATIC amines , *ORGANIC synthesis , *OXIDATION , *POLYMERS , *CHEMICAL structure , *RADICAL cations - Abstract
Polyarylamine containing meta–para–para-aniline units in the main chain and meta–para-aniline units in the pendant chains was synthesized. The polymercan be oxidized to radical cations in chemical or electrochemicalways. The presence of meta-phenylenes in the polymerchemical structure allows for the ferromagnetic coupling of electronicspins, which leads to the formation of high spin states. Detailedpulsed-EPR study indicates that the S= 2 spin statewas reached for the best oxidation level. Quantitative magnetizationmeasurements reveal that the doped polymer contains mainly S= 2 spin states and a fraction of S=3/2 spin states. The efficiency of the oxidation was determined tobe 74%. To the best of our knowledge, this polymer is the first exampleof a linear doped polyarylamine combining such high spin states withhigh doping efficiency. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF