Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
Studies of Photochemical Reactions Using Organic Photosensitizers. III. Direct Photolysis and Biacetyl-photosensitized Decomposition of Azopropanes
Shigeru YamashitaKuniyasu OkumuraTeruo Hayakawa
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1973 Volume 46 Issue 9 Pages 2744-2747


The direct photolyses in the two wavelength regions and the biacetyl-photosensitized decomposition have been studied for l,l′-azo-n-propane and 2,2′-azo-isopropane. The value of kd/kc, the ratio of the disproportionation rate to the combination rate of free radicals, has been found to be slighlty dependent on the exciting wavelength as for n-propyl and isopropyl radicals. The higher the exciting energies, the larger the ratio kd/kc. From the quenching study of biacetyl phosphorescence, it was found that the energy of the excited biacetyl molecule was transferred to the azopropane molecule at every collision.

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