The Structure of Ammonium,D,L—Tartrate

1 INTRODUCTION The enantiomers separated by a co- crystallization method using an appropriate chiral as separating reagent has attracted many attentions in the past years1]. Recently we are interested in enantiomeric discrimination by chiral amino acid. When racemic D,L-tartaric acid was tried to be separated by the L-glutamine in a hot aqueous solution, the well shaped crystals were obtained. The determination of melting point (220℃) and density (1.66 g穋m－3) showed it is…

The Structure of Ammonium D,L-Tartrate

The single crystals of the title compound NH4+C4H5O6- (C4H9NO6, Mr = 167.1) were obtained from a hot aqueous solution containing L-glutamine and D,L-tartaric acid in mole ratio1:1.5. The crystal belongs to monoclinic space group P21/c with a = 7.646(2), b = 7.804(2), c = 11.502(3)? ?= 102.26(2)o, V = 670.7(3)?, Z = 4, F(000) = 352, Dc = 1.655 g.cm-3, m(MoKa) = 0.16 mm-1, R = 0.035, wR = 0.094 for 1028 observed reflections (I>2s(I)). The enatiomeric anions of the tartrate with both (2S,3S)- and (2R,3R)-configuration co-exist in the unit cell. The carbon skeleton assumes a coplanar arrangement with a torsion angle of 181.5o. The three- dimensional H-bonding network exists in the crystal. While tartrate groups link each other by H-bonds between carboxyl and hydroxyl groups, the ammonium cations insert between the tartrate groups to form a sandwich-like crystal structure.