Photoinduced Intramolecular Electron Transfer in Peptide-Bridged Molecules

  • Schanze K
  • Sauer K
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p-Dimethoxybenzene (DMB)-contg. Ru complexes I (n = 0-4) and p-benzoquinone (Q)-contg. Ru complexes II (n = 0-4) were prepd. and the photophys. properties of the metal-to-ligand charge transfer (MLCT) excited state of the Ru(II) chromophore were examd. Steady state and time resolved luminescence expts. on the Pro-bridged DMB system show that the properties of the Ru MLCT excited state are only slightly modified from those of an unsubstituted model complex by the presence of covalently attached DMB peptides. Expts. on the Pro-bridged Ru-Q complexes show that the Q site quenches the yield and lifetime of the Ru MLCT emission. Furthermore, the quenching efficiency is diminished as the no. of peptide spacers is increased. The quenching process is ascribed to long-range intramol. Ru-to-Q electron transfer. This hypothesis is supported by time-resolved luminescence data which suggest that the av. electron transfer rate falls sharply with an increase in the peptide bridge length. [on SciFinder (R)]

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  • Kirk S. Schanze

  • Kenneth Sauer

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