Photoinduced electron transfer between anionic fluorophores and methyl viologen in homogeneous and microheterogeneous media

► Modulation of PET of biologically active fluorophores and Methyl viologen. ► Static and Dynamic Quenching present. ► PET enhanced upon encapsulation, studied through Fluorescence upconversion experiments. ► Rotational anisotropy has significant contribution in quenching.