We review some of our results on the role of solvent reorganization as an actual reaction coordinate in a few photoinduced charge-transfer processes concerning: dimethylaminobenzonitrile (DMABN), bianthryl and its 10-cyano-derivative and anthracenedimethylaniline (ADMA), in solution at room temperature. These processes were studied by subpicosecond transient absorption spectroscopy. We also describe some of our recent results on charge-transfer processes involved in the primary response of photoactive proteins such as the photoactive yellow protein (PYP) and the oxyblepharismin-binding protein (OBIP). The deciding role of the protein environment in the photophysics of the chromophore is emphasized.
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