title: 1,5-Bis(2-methyl-phen-yl)-3-nitro-formazan.
abstract: In the title compound, C(15)H(15)N(5)O(2), the nitro O atoms are disordered over two sets of sites with an occupancy ratio of 0.75 (4):0.25 (4). Amine-imine tautomerism is observed in the formazan group. This was evident from the similar C-N bond distances in the formazan [1.319 (2) and 1.332 (3) Å], as well as the distribution of the imine proton in the Fourier difference map which refined to a 0.53 (3):0.47 (3) ratio. C-H⋯O and π-π inter-actions [centroid-centroid distances = 3.4813 (1) and 3.3976 (1) Å] are observed in the crystal packing.
authors.forename: Karel G
authors.initials: KG
authors.lastname: von Eschwege
authors.forename: Eric C
authors.initials: EC
authors.lastname: Hosten
authors.forename: Alfred
authors.initials: A
authors.lastname: Muller