Photophysical properties of 2-nitro-5,10,15,20-tetra-p-tolylporphyrins.

John Devens Gust, Thomas A Moore, D. K. Luttrull, G. R. Seely, E. Bittersmann, R. V. Bensasson, M. Rougée, E. J. Land, F. C. De Schryver, M. Van der Auweraer

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Abstract

Tetraarylporphyrins substituted with nitro groups at beta-pyrrolic positions are potential candidates for electron-accepting pigments in model systems for photosynthesis. The photophysics of 2-nitro-5,10,15,20-tetra-p-tolylporphyrin and its zinc analog have been studied in order to evaluate this potential. The ground state absorption spectrum, the triplet-triplet absorption spectrum, the fluorescence emission spectrum, and associated photophysical parameters have been determined. The molecules have short singlet lifetimes and anomalous temperature- and solvent-dependent emission spectra which are consistent with the formation of an intramolecular charge transfer state of the type P+.-NO2-. in which the nitro group is twisted about its bond to the porphyrin, relative to the ground state conformation.

Original languageEnglish
Pages (from-to)419-426
Number of pages8
JournalPhotochemistry and Photobiology
Volume51
Issue number4
Publication statusPublished - Apr 1990

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

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Gust, J. D., Moore, T. A., Luttrull, D. K., Seely, G. R., Bittersmann, E., Bensasson, R. V., Rougée, M., Land, E. J., De Schryver, F. C., & Van der Auweraer, M. (1990). Photophysical properties of 2-nitro-5,10,15,20-tetra-p-tolylporphyrins. Photochemistry and Photobiology, 51(4), 419-426.