4-(Methyl-amino)benzoic acid

Abstract

The asymmetric unit of the title compound, C8H 9NO2, contains three crystallographically independent mol-ecules, which are essentially planar, the carboxyl O atoms deviating by 0.091 (3), 0.101 (2) and 0.164 (3) Å from the mean plane through the non-H atoms. In the crystal, all three mol-ecules form O- H⋯O hydrogen-bonded about inversion centers, forming eight-membered rings with graph-set notation R 2 2(8). In addition, N- H⋯O hydrogen bonding and C- H⋯π inter-actions reinforce the packing.