Transition metal complexes of Ru(II), Os(II) or Ir(III) exhibit exeptional properties and enable various light-driven processes. But they suffer from limited photophysical activity due to decreased extinction coefficients at higher wavelengths (after 500 nm) and relatively small excited-state (ES) lifetimes. The multichromophoric approach is one possibility to overcome those drawbacks. Usage of additional, organic chromophores should enable us to use a wide range of the solar spectrum and extend the ES lifetimes. As a novel rylene type dye a diimine ligand with a fully rigid and extended π-system in its backbone was prepared by directly fusing a 1,10-phenanthroline building block with 1,8-naphthalimide. The corresponding heteroleptic ruthenium photosensitizer was synthesized and extensively analyzed by a combination of NMR, single crystal X-ray diffraction, steady-state absorption and emission, time-resolved spectroscopy and different electrochemical measurements supported by time-dependent density functional theory calculations.
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