The quantum yields of stepwise cyclization of the first and second diphenylamino groups in 1,4-bis(diphenylamino)butane are 0.3 and 0.02, respectively, which indicates quenching of the excited diphenylamino group by a carbazole unit in the asymmetric semi-cyclized compound.
M. F. Budyka, O. D. Laukhina and T. N. Gavrishova, Mendeleev Commun., 1998, 8, 59 DOI: 10.1070/MC1998v008n02ABEH000901
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