Get access
Advertisement

ENERGY TRANSFER IN SELF-ASSEMBLED CHLOROPHYLL a SYSTEMS *

Authors

  • M. J. Yuen,

    1. Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA
    Search for more papers by this author
    • Postdoctoral appointee 1978-1979. Current address: Engineering Research Center, Western Electric Co., Princeton, NJ 08540, USA.

  • L. L. Shipmanj,

    1. Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA
    Search for more papers by this author
    • Central Research and Development Department, Experimental Station, E.I. duPont de Nemours and Co., Inc., Wilmington, DE 19898, USA.

  • J. J. Katz,

    1. Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA
    Search for more papers by this author
  • J. C. Hindman

    1. Chemistry Division, Argonne National Laboratory, Argonne, IL 60439, USA
    Search for more papers by this author

  • *

    Work performed under the auspices of the Office of Basic Energy Sciences, Division of Chemical Sciences, US Department of Energy.

Abstract

Abstract Computer deconvolution of the optical absorption spectra has been used to follow the formation and transformation of various chlorophyll species formed by lowering the temperature in solutions of toluene or methylcyclohexane containing a hydrogen-bonding nucleophile such as ethanol. At cryogenic temperatures the self-assembled chlorophyll a-ethanol species has optical properties similar to those of special pair photoreaction center chlorophyll. Analysis of the absorption and fluorescence behavior of the self-assembled species suggests that chlorophyll-chlorophyll species are also formed in the self-assembly process. Fluorescence lifetime measurements indicate that the pathways for dissipation of excitation energy in these multicomponent systems are complex. Selective optical excitation at wavelengths corresponding to absorption of monomer, oligomer, etc. chlorophyll a species has been used to demonstrate the heterogeneous nature of these self-assembled systems.

Get access to the full text of this article

Ancillary