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The above mentioned emissions can be ascribed to that part of the molecule which is formed from the intermediate spin-delocalized triazenyl radical ( 5 ) in the recombination.The part arising from the p-tolylazo radical (6) apparently does not play any effective role in the polarization of CH3 protons, as we have been able t o show in o u r experiments with p-tolylazotriphenylinethane. These findings confirm the existence of arylazo radicals, e.g. ( 6 ) , which have already been formulated on many occasions as reactive intermediates 171 and support the idea of CIDNP in radical pair recombination in the solvent cage 14Cl.

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