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The photolysis of 4,4′-diazidobiphenyl in an organic glassy solvent at low-temperature was investigated by ESR and UV-vis spectroscopies. Two structures of biphenyldinitrene as photoproducts were identified: the twisted biphenyldinitrene and the quinonoid structure. The two nitreno groups of twisted biphenyl were each in the triplet state.
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Ohana et al. (1993) studied this question.
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