Showing papers by "Tetsuro Kusamoto published in 2023"
TL;DR: In this paper , a photostable luminescent organic radicals and open-shell metal complexes with luminous radicals as ligands were investigated, and it was shown that the radicals can demonstrate photofunctions unique to their openshell electronic states, such as magnetic-field-controlled luminescence.
Abstract: Stable radicals possess open-shell electronic states and exhibit vivid physical properties such as electrical conductivity and magnetism attributed to unpaired electrons. Their luminescence properties, however, have yet to be well examined, mainly due to the rarity of emissive radicals and chemical reactivity in their excited states. I have developed highly-photostable luminescent organic radicals and luminescent open-shell metal complexes with luminescent radicals as ligands, and investigated photofunctions based on their doublet or multiplet states. The studies suggest that the radicals can demonstrate photofunctions unique to their open-shell electronic states, such as magnetic-field-controlled luminescence, which are unexpected or impossible to achieve for conventional closed-shell molecules. Such functions will expand the scope of the radicals in molecular photonics.
TL;DR: In this article , it was shown that a covalently linked luminescent radical dimer (diradical) can exhibit magnetoluminescence (ML) as a single-molecular property.
Abstract: Luminescent radicals are an emerging class of materials that exhibit unique photofunctions not found in closed-shell molecules due to their open-shell electronic structure. Particularly promising are photofunctions in which radical's spin and luminescence are correlated; for example, when a magnetic field can affect luminescence (i.e., magnetoluminescence, ML). These photofunctions could be useful in the new science of spin photonics. However, previous observations of ML in radicals have been limited to systems in which radicals are randomly doped in host crystals or polymerized through metal complexation. This study shows that a covalently linked luminescent radical dimer (diradical) can exhibit ML as a single-molecular property. This facilitates detailed elucidation of the requirements for and mechanisms of ML in radicals and can aid the rational design of ML-active radicals based on synthetic chemistry.