Synthesis and magnetic behavior of stable organic open-shell polymers containing phenothiazine cation radicals as spin resources

Two types of organic open-shell polymer containing phenothiazine cation radicals as spin resources were synthesized and the magnetic behaviors were investigated. The one is the 1,3-phenylene-linked polymer, and the other is the arylamine nitrogen-linked polymer. Precursor polymers were prepared by the Suzuki-Miyaura coupling and the Pd-catalyzed amination. The formation of complexes between the phenothiazine moieties in precursor polymers and antimony(V) chloride gave stable open-shell polymers. The magnetic behavior of 1,3-phenylene-linked polymer was intramolecularly ferromagnetic, but intermolecularly antiferromagnetic. Whereas, the arylamine nitrogen-linked polymer was in the S = 1 spin state in spite of low spin concentration of 0.16 spins per repeating unit.

Two types of organic open-shell polymer containing phenothiazine cation radicals as spin resources were synthesized and the magnetic behaviors were investigated. The one is the 1,3-phenylene-linked polymer, and the other is the arylamine nitrogen-linked polymer. The magnetic behavior of 1,3-phenylene-linked polymer was intramolecularly ferromagnetic, but intermolecularly antiferromagnetic. Whereas, the arylamine nitrogen-linked polymer was in the S = 1 spin state in spite of low spin concentration.Figure optionsDownload as PowerPoint slide