STUDY OF PHOTOINDUCED PROCESSES OF A DYAD BDP-C60 UNDER EXCITED BOTH ITS DONOR AND ACCEPTOR MOIETIES

Abstract

In this paper, A BODIPY-C₆₀ Dyad system composed of a BDP donor and a Fullerene acceptor has been studied photoinduced processes using ultrafast transient absorption spectroscopies. Under excitation at 380 nm, both donor (BDP) and acceptor (C₆₀) were excited. The existence of three conformers of BDP-C₆₀ structures was indicated as a result of different photoinduced processes under excitation wavelength at 380 nm, including both electron transfer and energy transfer. The ultrafast - Femtosecond transient absorption spectra deciphered the charge transfer and energy transfer between two parts of the dyad systems. The shortest donor-acceptor distance conformer (8.8 ), which is noted as conformer 1, was designated as the cause of two fast and ultrafast electron transfers from the Frank-Condon region and singlet excited state of BDP to C₆₀. The rates of two-electron transfer processes were estimated at about 2.5 ×10¹² and 1.7 × 10¹¹ s^-1. Likewise, the longer donor-acceptor distance conformers (17.5 and 20.5 ) were responsible for two energy transfer processes in the BDP-C₆₀ dyad system.