Acceleration of the through space S-1 energy transfer rates in cofacial bisporphyrin bio-inspired models by virtue of substituents effect on the Forster J integral and its implication in the antenna effect in the photosystems

The singlet k(ET) for cofacial beta-octaalkylporphyrin/bis(meso-aryl)-porphyrin dyads increases linearly with the gap between the donor-acceptor 0-0 fluorescence peaks at 77 K.