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 in the 7.44-13.6 ps range, intersystem crossing in the 033-1.09 ns range, and triplet lifetime (τtriplet) in the 0.8-3.5 μs 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 calculations were performed for the three molecules. The HOMO/LUMO energy levels and the oscillator strengths of various transitions were determined and presented.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films