Abstract
OXYGEN-FREE solutions of chlorophyll in methanol undergo rapid, reversible photochemical changes if they are exposed to a flash of intense light1. The reversible formation of pairs of radicals, which can be detected by the use of steady, comparatively weak illumination2, is apparently preceded by the efficient photochemical production of chlorophyll molecules in a metastable (presumably triplet) state, having a half-life of about 5 × 10−4 sec. Since the experiments, upon which the foregoing conclusions1 were based, were incomplete and, in many respects, preliminary in character, it was thought worth while to attempt to confirm and to extend them using the method3 of flash photolysis and flash spectroscopy.
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References
Livingston, R., and Ryan, V., J. Amer. Chem. Soc., 75, 2176 (1953).
(a) Porret, D., and Rabinowitch, E., Nature, 140, 321 (1937). (b) McBrady, J., and Livingston, R., J. Phys. Chem., 45, 1312 (1941). (c) Knight, J., and Livingston, R., J. Phys. Chem., 54, 703 (1950).
Porter, G., Proc. Roy. Soc., A, 200, 284 (1950).
Porter, G., and Windsor, M., J. Chem. Phys., 21, 2088 (1953).
Livingston, R., Watson, W., and McArdle, J., J. Amer. Chem. Soc., 71, 1542 (1949).
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LIVINGSTON, R., PORTER, G. & WINDSOR, M. Phototropy of Chlorophyll Solutions. Nature 173, 485–486 (1954). https://doi.org/10.1038/173485a0
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DOI: https://doi.org/10.1038/173485a0
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