Crystal structure of ammonium (3,5-dichlorophenoxy)acetate hemihydrate

Abstract

In the structure of the title hydrated salt, NH4+·C8H5Cl2O3−·0.5H2O, where the anion derives from (3,5-dichlorophenoxy)acetic acid, the ammonium cation is involved in extensive N—H...O hydrogen bonding with both carboxylate and ether O-atom acceptors giving sheet structures lying parallel to (100). The water molecule of solvation lies on a crystallographic twofold rotation axis and is involved in intra-sheet O—H...Ocarboxylatehydrogen-bonding interactions. In the anion, the oxoacetate side chain assumes anantiperiplanarconformation with the defining C—O—C—C torsion angle = −171.33 (15)°.