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Monatshefte für Chemie / Chemical Monthly

, Volume 131, Issue 10, pp 1039–1045 | Cite as

On the Photochemical Proton Expulsion Capability of Fringelite D – A Model of the Protist Photosensory Pigments of the Stentorin and Blepharismin Types

  • Bettina Immitzer
  • Christoph Etzlstorfer
  • Roland A. Obermüller
  • Max Sonnleitner
  • Gerhard J. Schütz
  • Heinz Falk

Summary.

 Using simultaneous two-photon excitation of fringelite D and a fluorescence indicator embedded in a vesicle system it was demonstrated that after excitation a proton was transferred from the pigment to the indicator similarly as recently documented for hypericin. Semiempirical AM1 calculations were used to show that the radical species formed by electron transfer from the excited pigment state constitutes an acid which is therefore well suited for intermolecular proton transfer. Accordingly, this process constitutes a suited candidate for the primary photoprocess in the signal transduction cascade of the photosensory pigments of the stentorin and blepharismin type.

Keywords. Two-photon excitation; Intermolecular proton transfer; Epifluorescence microscopy; Phenanthroperylene quinones. 

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Copyright information

© Springer-Verlag/Wien 2000

Authors and Affiliations

  • Bettina Immitzer
    • 1
  • Christoph Etzlstorfer
    • 1
  • Roland A. Obermüller
    • 1
  • Max Sonnleitner
    • 2
  • Gerhard J. Schütz
    • 2
  • Heinz Falk
    • 1
  1. 1. Institut für Chemie, Johannes Kepler Universität, A-4040 Linz, AustriaAT
  2. 2. Institut für Biophysik, Johannes Kepler Universität, A-4040 Linz, AustriaAT

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