title: 8-Hy-droxy-quinolinium 2-carb-oxy-acetate.
abstract: In the title compound, C(9)H(8)NO(+)·C(3)H(3)O(4) (-), the cation and anion are each essentially planar, with maximum deviations of 0.043 (1) and 0.060 (1) Å, respectively. The dihedral angle between these two planes is 2.20 (4)°. The conformation of the anion is stabilized by an intra-molecular O-H⋯O hydrogen bond, which forms an S(6) ring motif. The hy-droxy group of the oxine unit makes a hydrogen bond with the one of the O atoms of the carboxyl-ate group of the 2-carb-oxy-acetate anion. Two other carboxyl-ate O atoms form R(2) (2)(7) ring motifs via inter-molecular C-H⋯O and N-H⋯O hydrogen bonds. The crystal structure is consolidated by weak inter-molecular C-H⋯O inter-actions, which link the cations and anions into a three-dimensional network.
authors: X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia.
authors: Ching Kheng
authors: CK
authors: Quah
authors: Wan-Sin
authors: WS
authors: Loh
authors: Madhukar
authors: M
authors: Hemamalini
authors: Hoong-Kun
authors: HK
authors: Fun
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