Acta Cryst. (2001). E57, o1250-o1251  [ doi:10.1107/S1600536801020128 ]

Redetermination of N,N-dimethyl-N-{4-[(E)-(4-methyl-3-nitrophenyl)diazenyl]phenyl}amine at 193 K: another example of dynamic disorder of substituted azobenzene compounds

O. Ya. Borbulevych and M. Yu. Antipin

Abstract: Redetermination of the title compound, C₁₅H₁₆N₄O₂, at 193 K reveals considerable differences in geometry of the central bridging fragment as compared to that at 293 K [Atroshchenko, Blokhina, Shakhel'dyan, Grudtsyn, Gitis, Borbulevich, Blokhin, Kaminskii, Shishkin & Andrianov (2000). Russ. J. Org. Chem. 36, 684-692]. The results show that there is apparent shortening of the N=N bond and lengthening of both neighbouring C-N bonds in the room-temperature structure compared with the low-temperature structure.

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