Abstract
IN a paper concerned chiefly with the results of measurements of the self-quenching of the fluorescence of solutions of aromatic hydrocarbons1, Weiss and Weil-Malherbe report a few measurements on the self-quenching of ethyl chlorophyllide solutions. They conclude from these latter results that it is unnecessary to postulate the existence of a long-lived form of excited chlorophyll. This conclusion has been shown by E. Rabinowitch2 to be inconsistent with the observed3 high quantum yields for chlorophyllsensitized photo-oxidation. More recently, the same author4 has pointed out that the value of the quenching constant obtained by Weiss and Weil-Malherbe is too large to be consistent with the number of encounters between chlorophyll molecules as calculated from kinetic theory.
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References
Weiss, J., and Weil-Malherbe, H., J. Chem. Soc., 544 (1944).
Rabinowitch, E., "Photosynthesis", 1, 484, 518 (1945).
Gaffron, H., Ber., 60, 755 (1927).
Rabinowitch, E., "Photosynthesis", 2, Chapter 23 (in the press).
Zscheile, F. P., and Harris, D. S., J. Phys. Chem., 47, 623 (1943).
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WATSON, W., LIVINGSTON, R. Concentration Quenching of Fluorescence in Chlorophyll Solutions. Nature 162, 452–453 (1948). https://doi.org/10.1038/162452a0
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DOI: https://doi.org/10.1038/162452a0
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