title: Tuning of ferromagnetic spin interactions in polymeric aromatic amines via modification of their π-conjugated system.
abstract: Polyarylamine containing meta-para-para-aniline units in the main chain and meta-para-aniline units in the pendant chains was synthesized. The polymer can be oxidized to radical cations in chemical or electrochemical ways. The presence of meta-phenylenes in the polymer chemical structure allows for the ferromagnetic coupling of electronic spins, which leads to the formation of high spin states. Detailed pulsed-EPR study indicates that the S = 2 spin state was reached for the best oxidation level. Quantitative magnetization measurements 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 to be 74%. To the best of our knowledge, this polymer is the first example of a linear doped polyarylamine combining such high spin states with high doping efficiency.
authors.affiliation: Faculty of Chemistry, Warsaw University of Technology, Warsaw, Poland.
authors.forename: Ewelina
authors.initials: E
authors.lastname: Dobrzyńska
authors.forename: Mohammad
authors.initials: M
authors.lastname: Jouni
authors.forename: Paweł
authors.initials: P
authors.lastname: Gawryś
authors.forename: Serge
authors.initials: S
authors.lastname: Gambarelli
authors.forename: Jean-Marie
authors.initials: JM
authors.lastname: Mouesca
authors.forename: David
authors.initials: D
authors.lastname: Djurado
authors.forename: Lionel
authors.initials: L
authors.lastname: Dubois
authors.forename: Ireneusz
authors.initials: I
authors.lastname: Wielgus
authors.forename: Vincent
authors.initials: V
authors.lastname: Maurel
authors.forename: Irena
authors.initials: I
authors.lastname: Kulszewicz-Bajer