Crystal structure of di­methyl­ammonium hydrogen oxalate hemi(oxalic acid)

Acta Crystallographica Section E: Crystallographic Communications

Cattey, H.¹  Plasseraud, L.³  Diallo, W.⁷  Crochet, A.⁹  Gueye, N.^1,10 

[1] Cheikh Anta Diop, Dakar, Senegal;de Bourgogne, Facultédes Sciences et Techniques, Universitédes Sciences, 9 avenue Alain Savary, 21000 Dijon, France;Department of Chemistry, University of Fribourg, Chemin des MuséICMUB UMR 6302, UniversitéLaboratoire de Chimie Minée 9, CH-1700 Fribourg, Switzerland;partement de Chimie, Facultérale et Analytique (LACHIMIA), Dé

关键词: CRYSTAL STRUCTURE;    ORGANIC SALT;    HYDROGEN BONDING;    HYDROGENOXALATE;    DIALKYAMMONIUM;    OXALIC ACID.;   

DOI  :  10.1107/S2056989015005964

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

Single crystals of the title salt, Me2NH2+·HC2O4−·0.5H2C2O4, were isolated as a side product from the reaction involving Me2NH, H2C2O4 and Sn(n-Bu)3Cl in a 1:2 ratio in methanol or by the reaction of the (Me2NH2)2C2O4 salt and Sn(CH3)3Cl in a 2:1 ratio in ethanol. The asymmetric unit comprises a di­methyl­ammonium cation (Me2NH2+), an hydrogenoxalate anion (HC2O4−), and half a mol­ecule of oxalic acid (H2C2O4) situated about an inversion center. From a supra­molecular point of view, the three components inter­act together via hydrogen bonding. The Me2NH2+ cations and the HC2O4− anions are in close proximity through bifurcated N—H⋯(O,O) hydrogen bonds, while the HC2O4− anions are organized into infinite chains via O—H⋯O hydrogen bonds, propagating along the a-axis direction. In addition, the oxalic acid (H2C2O4) mol­ecules play the role of connectors between these chains. Both the carbonyl and hydroxyl groups of each diacid are involved in four inter­molecular inter­actions with two Me2NH2+ and two HC2O4− ions of four distinct polymeric chains, via two N—H⋯O and two O—H⋯O hydrogen bonds, respectively. The resulting mol­ecular assembly can be viewed as a two-dimensional bilayer-like arrangement lying parallel to (010), and reinforced by a C—H⋯O hydrogen bond.

【 授权许可】

CC BY