Photoinduced intermolecular electron transfer between Coumarin dyes and electron donating solvents in cetyltrimethylammonium bromide (CTAB) micelles: evidence for Marcus inverted region

The photoinduced electron transfer between different Coumarin dyes and aromatic amines in cetyltrimethylammonium bromide (CTAB) micellar solution has been reported using both steady state and time resolved fluorescence quenching measurement. The location of the dye molecules in micelles has been confirmed by the time resolved fluorescence anisotropy measurement. The plot of the observed Kq values in the CTAB micellar solution with the free energy change (ΔG∘) for electron transfer reaction show an inversion in the observed rate as predicted by Marcus theory. The two-dimensional electron transfer model has been employed to interpret the Marcus inverted region.