title: Crystal structure of 2-methyl-1H-imidazol-3-ium hydrogen oxalate dihydrate.
abstract: Single crystals of the title mol-ecular salt, C4H7N2 (+)·HC2O4 (-)·2H2O, were isolated from the reaction of 2-methyl-1H-imidazole and oxalic acid in a 1:1 molar ratio in water. In the crystal, the cations and anions are positioned alternately along an infinite [010] ribbon and linked together through bifurcated N-H⋯(O,O) hydrogen bonds. The water mol-ecules of crystallization link the chains into (10-1) bilayers, with the methyl groups of the cations organized in an isotactic manner.
authors.affiliation: Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal.
authors.forename: Mouhamadou Birame
authors.initials: MB
authors.lastname: Diop
authors.affiliation: Laboratoire de Chimie Minérale et Analytique (LACHIMIA), Département de Chimie, Faculté des Sciences et Techniques, Université Cheikh Anta Diop, Dakar, Senegal.
authors.forename: Libasse
authors.initials: L
authors.lastname: Diop
authors.affiliation: ICMUB UMR 6302, Université de Bourgogne, Faculté des Sciences, 9 avenue Alain Savary, 21000 Dijon, France.
authors.forename: Laurent
authors.initials: L
authors.lastname: Plasseraud
authors.affiliation: ICMUB UMR 6302, Université de Bourgogne, Faculté des Sciences, 9 avenue Alain Savary, 21000 Dijon, France.
authors.forename: Hélène
authors.initials: H
authors.lastname: Cattey
keywords: crystal structure; hydrogen bonds; hydrogen oxalate; monosubstituted imidazolium; organic salt