title: 4-Nitro-anilinium p-toluene-sulfonate.
abstract: In the cation of the title salt, C(6)H(7)N(2)O(2) (+)·C(7)H(7)O(3)S(-), the benzene ring makes a dihedral angle of 10.2 (2)° with the nitro group. In the crystal, the cations and anions are linked by weak N-H⋯O hydrogen bonds, forming a layer parallel to the ac plane. A weak C-H⋯O inter-action and π-π inter-actions [centroid-centroid distances of 3.738 (3) and 3.748 (3) Å] also observed within the layer.
authors.affiliation: Department of Physics, MNM Jain Engineering College, Chennai 600 097,  India.
authors.forename: P K
authors.initials: PK
authors.lastname: Sivakumar
authors.forename: M
authors.initials: M
authors.lastname: Krishnakumar
authors.forename: R
authors.initials: R
authors.lastname: Kanagadurai
authors.forename: G
authors.initials: G
authors.lastname: Chakkaravarthi
authors.forename: R
authors.initials: R
authors.lastname: Mohankumar