Femtosecond to Microsecond Dynamics of Soret-Band Excited Corroles.

We present a comprehensive photophysical investigation on a series of three corroles (TTC, P-TTC, Ge-TTC dissolved in toluene), employing femtosecond and nanosecond transient absorption spectroscopy (TAS) measurements. Systematic analyses of the TAS data determined the rates and corresponding time constants of photophysical processes: internal conversion (τIC) in the 898-525 fs range, vibrational relaxation (τ_VR) in the 7.44-13.6 ps range, intersystem crossing (τISC ) in the 033-1.09 ns range and triplet lifetime (τ_triplet) in the 0.8-3.5μs range. The estimated triplet quantum yields (ΦTriplet) were in the 0.42 - 0.61 range. Comparatively, GeTTC displayed faster τIC and higher(ΦTriplet). Additionally, the time-dependent density functional theory (DFT) calculations were performed for the three molecules. The HOMO/LUMO energy levels and the oscillator strengths of various transitions were determined and presented.