Tetraethylammonium L-malate 1.36-hydrate

Abstract

The asymmetric unit of the title compound, C8H20N+·C4H5O5 -·1.36H2O, contains two independent ion pairs, with similar conformations, and three water mol-ecules of crystallization, one water mol-ecule haing a site-occupancy factor of 0.721 (5). Intra-molecular O - H⋯O hydrogen bonds, involving the hydr-oxy groups and an O atom of each carboxyl-ate anion, generate five-membered rings involving S(5) ring motifs. In the crystal structure, mol-ecules are linked together by water mol-ecules through four-membered O - H⋯O - H⋯O - H inter-actions to form one-dimensional infinite chains along the a axis. Since the mol-ecules are also linked into one-dimensional infinite chains along the b axis, mol-ecular sheets parallel to the (001) plane are created. Overall, the crystal structure is stabilized by two intra-molecular O - H⋯O hydrogen bonds, nine inter-molecular O - H⋯O and ten C - H⋯O hydrogen bonds.