Figure 4.

Excitation irradiance dependence of the average excited state lifetime <τ> of the homopolymer [co-PS-CH₂NHCO-(Ru^II₁₆)](PF₆)₃₂ (5) (in CH₃CN at 25°C) overlaid with the excitation irradiance dependence for the formation of the redox separated state η_sen in antenna-reaction center assembly [co-PS-CH₂NHCO-(Ru^II(RC)₃Ru^II₁₇)](PF₆)₄₆ (4). Values for η_sen were calculated by using Eq. 5. The decrease in both quantities with increasing irradiance is a consequence of multiphoton excitation followed by self quenching within individual polymeric strands.