The diphenyl-amino radical dimer

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Abstract
E.S.R. measurements on the photodissociation-products of tetraphenyl-hydrazine in rigid solution at 77°K indicate that the principal product of this dissociation is the dimer of the diphenyl amino radical. This assignment is confirmed by a measurement of a half-field signal and computer simulation of the E.S.R. spectra in rigid solution. A long wavelength charge-transfer band arises through the interaction of the two diphenyl amino radicals. An SCMO calculation is presented, which gives a theoretical background to the latter assignment.