Glycine–phthalic acid (1/1)

In the title compound, C₂H₅NO₂·C₈H₆O₄, the glycine mol­ecule exists as a zwitterion (2-aza­niumyl­ethano­ate) with a positively charged amino group and a negatively charged carboxyl­ate 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 mol­ecules inter­act with the zwitterions in such a way that benzene rings protrude up and down from the layer.

catena-Poly[[[aqua­(glycine-κO)lithium]-μ-glycine-κ²O:O′] bromide]

In the title coordination polymer, {[Li(C₂H₅NO₂)₂(H₂O)]Br}_n, the Li⁺ cation is coordinated by three carboxyl­ate O atoms of zwitterionic glycine mol­ecules and by a water mol­ecule, forming a distorted tetra­hedral geometry. One of the two glycine mol­ecules bridges neighbouring complexes, forming an infinite chain parallel to the c axis. Polymeric chains are further linked by extensive hydrogen bonds involving the Br⁻ anions and glycine and water mol­ecules, producing a three-dimensional network.