Interaction of proflavin with aromatic amines in homogeneous and micellar media: Photoinduced electron transfer probed by magnetic field effect

Photoinduced electron transfer (PET) between proflavin (PF+) and two aromatic amines viz., dimethylaniline (DMA) and 4,4′-bis(dimethylamino)diphenylmethane (DMDPM) is studied in homogeneous and heterogeneous media using steady-state as well as time-resolved fluorescence spectroscopy and laser flash photolysis with an associated magnetic field. Ionic micelles have been used to study the effect of charge of proflavin on PET with amines. Magnetic field effect on PET reactions reveals that the parent spin-state of precursors of PET for DMA-PF+ system is singlet while for DMDPM-PF+ system is triplet, implying that the dynamics of PET is influenced by the structure of the donor.