Photoinduced electron transfer in alkanoylpyrene aggregates in conjugated polypeptides

An alkanoylpyrene moiety was used as a principal chromophore for labeling photoactive amphipathic polypeptides with a high propensity for self-assembly. Electrochemical, emission and transient absorption data showed that photoinduced electron transfer within pairs of pyrene pendants accounts for a lower fluorescence quantum yield observed for aggregated chromophores and for the formation of radical-ion, intermediates.