Glycine-phthalic acid (1/1)

Abstract

In the title compound, C2H5NO2·C8H6O4, the glycine mol-ecule exists as a zwitterion (2-aza-niumyl-ethano-ate) with a positively charged amino group and a negatively charged carboxyl-ate group. In the crystal, N-H⋯O and O-H⋯O hydrogen bonds link the components into layers parallel to the ab plane. The central part of each layer is composed of hydrogen-bonded glycine zwitterions, while phthalic acid mol-ecules inter-act with the zwitterions in such a way that benzene rings protrude up and down from the layer.

Fig. 1.

A content of asymmetric unit of (I) showing the atomic-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level.

Fig. 2.

Basic aggregation pattern in (I) viewed in [100]. Dashed lines denote hydrogen bonds. H atoms have been omitted for clarity.

Fig. 3.

Head-to-tail sequences of zwitterionic glycine molecules in (I) viewed in [001]. Dashed lines denote hydrogen bonds. H atoms not involved in H-bonding were omitted for clarity.