Crystal structure of (S)-sec-butylammonium L-tartrate monohydrate

Abstract

The title hydrated molecular salt, C4H12N+·C4H5O6 −·H2O, was prepared by deprotonation of enantiopure L-tartaric acid with racemic sec-butylamine in water. Only one enantiomer was observed crystallographically, resulting from the combination of (S)-sec-butylamine with L-tartaric acid. The sec-butylammonium moiety is disordered over two conformations related by rotation around the CH–CH2 bond; the refined occupancy ratio is 0.68 (1):0.32 (1). In the crystal, molecules are linked through a network of O—H...O and N—H...O hydrogen-bonding interactions, between the ammonium H atoms, the tartrate hydroxy H atoms, and the interstitial water, forming a three-dimensional supramolecular structure.