Ultrafast Dynamics of Tripyrrindiones in Solution Mediated by Hydrogen-Bonding Interactions

Abstract

TD1 is present as a monomer. The distinction between dimer and monomer determines the dynamics of the system, with faster internal conversion observed in the dimer form. The ultrafast dynamics were characterized using time-correlated single photon counting, fluorescence upconversion, and transient absorption measurements. The time-resolved dynamics of both the monomer and dimer in solution were modeled using a Pauli master equation treatment for a three level system. The solvent-dependent optical properties were measured using steady-state absorption and fluorescence. This data was then used to calculate the quantum yield and extinction coefficients.