title: Bis(tetra-methyl-ammonium) oxalate monohydrate.
abstract: In the crystal structure of the title hydrated salt, 2C(4)H(12)N(+)·C(2)O(4) (2-)·H(2)O, the two independent cations, the anion and the water mol-ecule all lie on special positions of m site symmetry. In both cations, the mirror plane passes through the nitrogen atom and two methyl groups; in the anion, the mirror plane passes through two carbon and two oxygen atoms. The anions and water mol-ecules inter-act by O-H⋯O hydrogen bonding, forming a chain running along the b axis.
authors.forename: Yun-Xia
authors.initials: YX
authors.lastname: Yang
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.forename: Seik Weng
authors.initials: SW
authors.lastname: Ng