title: Crystal structure of ammonium (3,5-di-chloro-phen-oxy)acetate hemihydrate.
abstract: In the structure of the title hydrated salt, NH4 (+)·C8H5Cl2O3 (-)·0.5H2O, where the anion derives from (3,5-di-chloro-phen-oxy)acetic acid, the ammonium cation is involved in extensive N-H⋯O hydrogen bonding with both carboxyl-ate and ether O-atom acceptors giving sheet structures lying parallel to (100). The water mol-ecule of solvation lies on a crystallographic twofold rotation axis and is involved in intra-sheet O-H⋯Ocarboxyl-ate hydrogen-bonding inter-actions. In the anion, the oxoacetate side chain assumes an antiperiplanar conformation with the defining C-O-C-C torsion angle = -171.33 (15)°.
authors.affiliation: Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors.forename: Graham
authors.initials: G
authors.lastname: Smith
keywords: (3,5-di­chloro­phen­oxy)acetic acid; crystal structure; hydrated salt; hydrogen bonding; phen­oxy­acetic acid herbicides; tryptaminium salt