Luminescence and structure of the protonated forms of meso-tetraarylporphyrins in solution

Biospectroscopy
V N KnyukshtoG D Egorova

Abstract

A comparative study of the spectral-luminescent properties (at 293 K and 77 K) of meso-tetrakis(o-tolyl)porphyrin (o-TTP) and meso-tetraphenylporphyrin (TPP), and also meso-tetrakis(n-propyl)porphyrin (TPrP) in nonaqueous acid media has been carried out with the aim to reveal effects associated with the influence of methyl groups which hinder sterically the twist of the phenyl rings enhancing their conjugation with the macrocycle in acid medium. On the basis of the spectral data it is concluded that although the introduction of the methyl groups diminishes this twist of phenyls it does not eliminate it completely (the absorption spectra of protonated o-TTP are intermediate between those of TTP and TPrP). The fluorescence spectra of the protonated forms of o-TTP and TPP at 77 K are approximately mirror-symmetrical to the Q(0-0) and Q(0-1) absorption bands; on the elevation of the temperature up to 293 K the fluorescence and absorption bands broaden, the Stokes shift largely increases, and the mirror symmetry of the spectra disappears, which is indicative of changes in solute-solvent interactions in the S1 state. The analysis of the obtained data on the energetics of photophysical processes leads to the conclusion that the signif...Continue Reading

References

Jun 1, 1970·Photochemistry and Photobiology·A T GradyushkoM P Tsvirko

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Citations

Mar 9, 2010·ACS Applied Materials & Interfaces·Wenbing LiRuomei Gao

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