Syntheses and Properties of Open-Shell π-Conjugated Molecules

Abstract Organic compounds with an open-shell electronic structure, in which unpaired electrons remain in the molecule, have attracted much attention in recent years due to their high reactivity and unique physical and functional properties. This paper presents my recent studies on the investigation of the properties of organic radical species through a structural organic chemistry approach to synthesize molecules with new frameworks. In particular, this paper focuses on (1) elucidation of the electronic structure of singlet biradicals and exploration of the properties characterized by the unique electronic structure, (2) molecular interpretation of the strange magnetic state of graphene nanoribbons, and (3) elucidation of the new association mode of organic radical species.