Syntheses and Magnetic Properties of Bis (Nitronyl-nitroxides) Substituted Dihydrophenazine Radical Cations

Abstract

We have recently reported that (nitronyl nitroxide)-substituted dihydrophenazine radical cations exhibit interesting magnetic properties. For further development of this system, we have designed and synthesized a neutral dihydrophenazine derivative with two nitronyl nitroxides at 2,7-positions and its oxidized cationic species. We clarified 1) the neutral diradical species shows a weak ferromagnetic interaction between the two nitronyl nitroxides, 2) the cationic species exhibits a strong ferromagnetic interaction between the dihydrophenazine radical cation and the two nitronyl nitroxides. The structures and properties of these species will be described.