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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