SITE-SELECTION SPECTROSCOPY OF CHLOROPHYLL b IN MEMBRANES OF LECITHIN VESICLES AND IN OTHER SOLVENTS |
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| Authors: | J Fünfschilling D Walz |
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| Institution: | Institute of Physics, University of Basel, Klingelbergstr. 82, CH–4056 Basel, Switzerland and *Biozentrum, University of Basel, Klingelbergstr. 70, CH–4056Basel, Switzerland |
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| Abstract: | Abstract— Site-selection fluorescence spectra of chlorophyll b in membranes of lecithin vesicles and in the solvents ethanol, n -butanol, n -butyl acetate, 2-methyl tetrahydrofuran and toluene are presented. The spectra in vesicles display zero-phonon lines as pronounced as those in the best organic glasses. The characteristics of the distributions of O—O transition energies and of the electron-phonon couplings allow to infer the position of the chlorophyll molecule in the membrane of vesicles. It is thus found that the chromophore of chlorophyll b is situated in the layer formed by the ester moieties of the lecithins, i. e. close to the surface of the membrane but not in direct contact with the aqueous phase. |
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