Radical molecules have attracted attention because their electronic and spin states can be controlled by their structures and heteroatom substitutions. In this study, we investigated the control of electronic and spin states of 4,8,12-trioxotriangulene molecules adsorbed on an AuSix thin film formed on a gold (111) surface, using low-temperature scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. STM measurements revealed that various states of the molecule depending on the adsorption sites and their interactions with the substrate. Furthermore, using the STM tip to induce the formation and dissociation of Si–O bonds within single molecules, we successfully controlled the spin states and electronic properties of the molecules. This study has provided new insights that contribute to the development of molecular spintronics.

Created at: 2025-09-02 03:13:59 +0900 Updated at: 2026-10-15 04:34:09 +0900