Design and studies of azadipyrromethene appended donor-acceptor conjugates

Abstract

The research work presented in this thesis is comprised of syntheses, characterization, electrochemical and photophysical studies of aza-BODIPY appended donor-acceptor conjugates. The first chapter delivers an introduction to the research presented in the chapters that follow. It provides an overview of the primary events of natural photosynthetic processes, an understanding of which is essential for constructing artificial photosynthetic systems capable of harvesting light energy. The second chapter deals with photoinduced electron transfer processes occurring in the aza-BODIPY-C60 dyad and Ferrocene-aza-BODIPY systems. Femtosecond transient absorption spectroscopy showed efficient photoinduced electron transfer. In the third chapter (BODIPY)-aza-BODIPY dyad and triad were studied to explore the role of aza-BODIPY as an energy acceptor. Steady state optical absorption and emission studies revealed the occurrence of efficient energy transfer from singlet excited BODIPY to aza-BODIPY. Chapter four describes the supramolecular tetrad composed of aza-BODIPY, ZnP and fulleropyrrolidine, which was studied to explore both electron and energy transfer processes.