PHOTOPHYSICAL PROPERTIES OF 2‐NITRO‐5,10,15,20‐TETRA‐p‐TOLYLPORPHYRINS

Devens Gust, Thomas A. Moore, David K. Luttrull, Gilbert R. Seely, Edith Bittersmann, René V. Bensasson, Michel Rougée, Edward J. Land, F. C.De Schryver, M. Van der Auweraer

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Abstract

Abstract— Tetraarylporphyrins substituted with nitro groups at fipyrrolic 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
DOIs
Publication statusPublished - Apr 1990

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry

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    Gust, D., Moore, T. A., Luttrull, D. K., Seely, G. R., Bittersmann, E., Bensasson, R. V., Rougée, M., Land, E. J., Schryver, F. C. D., & Auweraer, M. V. D. (1990). PHOTOPHYSICAL PROPERTIES OF 2‐NITRO‐5,10,15,20‐TETRA‐p‐TOLYLPORPHYRINS. Photochemistry and Photobiology, 51(4), 419-426. https://doi.org/10.1111/j.1751-1097.1990.tb01733.x