Dipole-dipole transfer between acetone solvates of chlorophyll a and chlorophyll a dihydrate dimers in water/acetone mixtures. A model for P680 sensitized excitation |
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| Institution: | 1. Deutschsprachige Selbsthilfegruppe für Alkaptonurie (DSAKU) e,V., Stuttgart, Germany;2. Department of Psychiatry, University of Münster, Münster, Germany;3. Center for Clinical Chemistry, Microbiology and Transfusion, Klinikum St. Georg gGmbH, Germany;4. Probiodrug AG, Halle, Germany;5. Scil Productions, Halle, Germany;6. Universitätsklinikum Erlangen, Department of Experimental Therapy, Erlangen, Germany;7. Fraunhofer-Institute for Cell Therapy and Immunology, Department of Drug Design and Target Validation, 06120 Halle, Germany;8. St. Rochus-Hospital Telgte, 48291 Telgte, Germany;1. Department of Computer Science and Engineering (AIML), Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, Telangana, India;2. Department of Computer Science and Engineering, Neil Gogte Institute of Technology, Hyderabad, Telangana, India;3. Department of Fashion Technology, National Institute of Fashion Technology, New Delhi, India |
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| Abstract: | We describe a simple model for P680 sensitized excitation in photosynthesis. Chl a fluorescence quenching effects observed when water is added to Chl a solutions in acetone are shown to be the result of resonant transfer between acetone solvates of monomeric Chl a, Chl a·Ac, and dimers of Chl a dihydrate. The presence of (Chl a·2H2O)2 is evidenced by a 678 nm difference absorbance (ΔA band obtained on conversion of a 680 nm absorption shoulder to polycrystalline Chl a precipitate, (Chl a·H2O)n. The equilibration between (Chl a·2H2O)2 and Chl a·Ac as a principal mechanism for Chl a·Ac fluorescence quenching is supported by theoretical fits of the data. |
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