title: Crystal structure of quinolinium 2-carboxy-6-nitro-benzoate monohydrate.
abstract: In the anion of the title hydrated mol-ecular salt, C9H8N(+)·C8H4NO6 (-)·H2O, the protonated carboxyl and nitro groups makes dihedral angles of 27.56 (5) and 6.86 (8)°, respectively, with the attached benzene ring, whereas the deprotonated carb-oxy group is almost orthogonal to it with a dihedral angle of 80.21 (1)°. In the crystal, the components are linked by O-H⋯O and N-H⋯O hydrogen bonds, generating [001] chains. The packing is consolidated by weak C-H⋯N and C-H⋯O inter-actions as well as aromatic π-π stacking [centroid-to-centroid distances: 3.7023 (8) & 3.6590 (9)Å] inter-actions, resulting in a three-dimensional network.
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: J
authors.initials: J
authors.lastname: Mohana
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: M
authors.initials: M
authors.lastname: Divya Bharathi
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: G
authors.initials: G
authors.lastname: Ahila
authors.affiliation: Department of Physics, CPCL Polytechnic College, Chennai 600 068, India.
authors.forename: G
authors.initials: G
authors.lastname: Chakkaravarthi
authors.affiliation: Department of Physics, Presidency College, Chennai 600 005, India.
authors.forename: G
authors.initials: G
authors.lastname: Anbalagan
keywords: 2-carboxy-6-nitro­benzoate; crystal structure; hydrogen bonding; mol­ecular salt; quinolinium; π–π stacking inter­actions