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The title compounds, C 19 H 15 BrN 4 , C 20 H 16 BrN 4 and C 20 H 15 BrN 4 , are nitro-gen-rich organic compounds that are related by their synthesis. The verdazyl radical, in which stacking leads to anti-ferromagnetic inter-actions, was reported previously [Iwase et al. (2013 ▸). Phys. Rev. B , 88 , 184431]. For this compound, improved structural data and spectroscopic data are presented. The other two compounds have been crystallized for the first time and form stacks of dimers, roughly along the a -axis direction of the crystal. The formazan mol-ecule shows signs of rapid intra-molecular H-atom exchange typical for this class of compounds and spectroscopic data are provided in addition to the crystal structure. The triazole compound appears to be a side-product of the verdazyl synthesis.

acta crystallographica section e crystallographic communications

Syntheses, spectroscopy, and crystal structures of 3-(4-bromophenyl)-1,5-diphenylformazan and the 3-(4-bromophenyl)-1,5-diphenylverdazyl radical and the crystal structure of the by-product 5-anilino-3-(4-bromophenyl)-1-phenyl-1<i>H</i>-1,2,4-triazole

Syntheses, spectroscopy, and crystal structures of 3-(4-bromophenyl)-1,5-diphenylformazan and the 3-(4-bromophenyl)-1,5-diphenylverdazyl radical and the crystal structure of the by-product 5-anilino-3-(4-bromophenyl)-1-phenyl-1H-1,2,4-triazole