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Femtosecond to Microsecond Dynamics of Soret-Band Excited Corroles
- Raavi, Sai Santosh Kumar, Yin, Jun, Grancini, Giulia, Soci, Cesare, Soma, Venugopal Rao, Lanzani, Guglielmo, Giribabu, Lingamallu
- The Journal of Physical Chemistry C 2015 v.119 no.52 pp. 28691-28700
- energy, physical chemistry, spectroscopy, toluene
- 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.