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• W2105107311 abstract "Fulgimides monosubstituted with [M(bpy)3]2+ (M = Ru, Os; bpy = 2,2′-bipyridine) chromophore units and with a single bpy group were synthesized and investigated as components of conceivable dinuclear photochromic switches of luminescence. The E-, Z- and closed-ring (C) photoisomer forms of the bpy-bound fulgimide were successfully separated by semi-preparative HPLC. The same procedure failed, however, in the case of the [M(bpy)3]2+-substituted fulgimides. Energy transfer from the excited photochromic unit to the metal-bpy centre competes with the fulgimide cyclization, reducing the photocyclization quantum yields by approximately one order of magnitude compared to the non-complexed fulgimide-bpy ligand (φEC = 0.17, φEZ = 0.071, φZE = 0.15 at λexc = 334 nm). The cycloreversion of the fulgimide-bpy ligand is less efficient (φCE = 0.047 at λexc = 520 nm). The intensity of the 3MLCT-based luminescence of the metal-bpy chromophore (in MeCN, φdeaer = 6.6 × 10−2 and τdeaer = 1.09 μs for Ru; φdeaer = 6.7 × 10−3 and τdeaer = 62 ns for Os) is not affected by the fulgimide photoconversion. These results and supporting spectro-electrochemical data reveal that the lowest triplet excited states of the photochromic fulgimide moiety in all its E-, Z- and closed-ring forms lie above the lowest 3MLCT levels of the attached ruthenium and osmium chromophores. The actual components are therefore unlikely to form a triad acting as functional switch of energy transfer from [Ru(bpy)3]2+ to [Os(bpy)3]2+ through the photochromic fulgimide bridge." @default.
• W2105107311 created "2016-06-24" @default.
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• W2105107311 date "2009-01-01" @default.
• W2105107311 modified "2023-10-12" @default.
• W2105107311 title "Photochemical, photophysical and redox properties of novel fulgimide derivatives with attached 2,2′-bipyridine (bpy) and [M(bpy)3]2+ (M = Ru and Os) moieties" @default.
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• W2105107311 doi "https://doi.org/10.1039/b821637c" @default.
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