While the electrochemical studies show that the reduced PFBT polymer will react with sufficiently strong acids, the photochemical case does not have to be so straightforward. In the photochemical system, there is not a large pool of high-energy electrons to reduce the polymer instead the generated exciton will have to be reductively quenched by the SD to get the reduced polymer. However, the exciton can, in theory, dissociate in many different ways, not only reductively, in PFBT both reductive quenching from DEA and oxidative quenching Pd particles have been previously reported .