Beilstein Arch. 2026, 202624. https://doi.org/10.3762/bxiv.2026.24.v1
Published 23 Jul 2026
Six new ruthenium(II) polypyridyl complexes incorporating pyridinyl, quinolinyl, or isoquinolinyl-benzimidazole ligands were synthesized to investigate the influence of π-conjugated mono- and bis-chelating ligands on their photophysical and electrochemical properties, and compared to the frontrunner [Ru(bpy)₃]2PF6. Their evaluation reveals that ligand π-extension modulates the ILCT and MLCT transitions, leading to red-shifted absorption and tunable excited-state redox potentials. The mononuclear complexes were further evaluated as visible-light photocatalysts through reactive oxygen species (ROS) generation and a model α-arylation reaction. These findings demonstrate that benzimidazole-based ligand engineering provides an effective strategy to tune the excited-state properties and photocatalytic behavior of ruthenium complexes.
Keywords: photocatalysis, ruthenium complexes, benzimidazoles
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Riss Yaw, B.; Saunier, A.; Porcher, A.; Cintrat, J.-C.; Romero, E. Beilstein Arch. 2026, 202624. doi:10.3762/bxiv.2026.24.v1
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