l-Glutamic acid hydrochloride at 153 K

Abstract

The title compound [systematic name: (S)-1,3-dicarboxypropanaminium chloride], C5H10NO4+·Cl−, has been investigated previously by Dawson [Acta Cryst. (1953). 6, 81–83], with R = 0.106 and without the location of H atoms, and then by Sequeira, Rajagopal & Chidambaram [Acta Cryst. (1972). B28, 2514–2519] using neutron diffraction with R = 0.043. The present determination at 153 K has R = 0.017 and all the H atoms are located. There are obvious differences in some C—C bond lengths between the present and previous studies. In the present structure, l-glutamic acid is protonated and is linked to the Cl− anion by an O—H...Cl hydrogen bond. The crystal structure is established by a three-dimensional network of O—H...O, N—H...O and N—H...Cl hydrogen bonds.