Experimental evidence for amino-group non-planarity in nitroanilines: neutron diffraction study of 2-methyl-5-nitroaniline at 100 K.

Reports on an appreciable degree of pyramidalization of the amine nitrogen (N) atom observed in 2-methyl-5-nitroaniline. Confirmation of the existence of polar chains; Description of the structure as non-polar layers with chains interlinked by centrosymmetric dimers; Implication that a relationship between molecular recognition patterns and crystal structures should not be assumed.