Excited-state properties of thiaporphyrins and their dications
作者： G. S. S. Saini , Anandi L. Verma , Ramasamy P. Pandian , Tavarekere K. Chandrashekar
DOI: 10.1039/FT9938900677
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摘要: Singlet excited-state properties of mono- and di-thiaporphyrins their dications are reported. A comparison vibrational frequencies the ring stretching modes neutral protonated species in resonance Raman spectra show shifts to both higher lower frequencies. An analysis various reveals that have predominantly an a2u ground state. The direction structurally sensitive indicates core expansion upon protonation. Protonation results red emission bands with considerable quenching fluorescence, magnitude which depends on number sulfur atoms porphyrin core. quantum yield lifetime thiaporphyrins found be decreased relative similar 5, 10, 15,20-tetraphenylporphyrin (H2TPP). estimated potentials suggest better reductants first singlet excited structural change accompanying protonation process accounts for most these observations.
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