STABILIZATION OF SEMIQUINONE INTERMEDIATES IN THE PHOTOREDUCTION OF PHENANTHRENEQUINONE BY COMPLEX FORMATION |
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| Authors: | J Rennert M Mayer J Levy J Kaplan |
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| Institution: | The City College of the City University of New York, N.Y. 10031, U.S.A. |
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| Abstract: | Abstract— The yellow color of 9,10-phenanthrenequinone in alcohol solution is bleached under the influence of exciting radiation in a band of wavelengths extending from the ultraviolet to the visible green. The bleaching is due to a photoreduction of the quinone yielding 9,10-dihydroxyphenanthrene. In the presence of certain divalent metal ions, irradiation of the quinoid material results in a blue-green long lived intermediate which may be further photo-reduced to the colorless 9,10-diol. The blue-green photo-intermediate is a cation-semiquinone complex. |
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