Femtosecond to Microsecond Dynamics of Soret-Band Excited Corroles

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• 作者：Sai Santosh Kumar Raavi ; Jun Yin ; Giulia Grancini ; Cesare Soci ; Venugopal Rao Soma ; Guglielmo Lanzani ; Lingamallu Giribabu
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：December 31, 2015
• 年：2015
• 卷：119
• 期：52
• 页码：28691-28700
• 全文大小：647K
• ISSN：1932-7455

文摘

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 (τ_IC) 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 (τ_triplet) in the 0.8–3.5 μs range. The estimated triplet quantum yields (Φ_triplet) were in the 0.42–0.61 range. Comparatively, GeTTC displayed faster τ_IC and higher Φ_triplet. 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.