An Experimental

R factor = 0.031; wR factor = 0.081; data-to-parameter ratio = 15.0. In the title compound, [K2(C7H3Cl2O2)2(H2O)]n, the potas-sium salt of 2,4-dichlorobenzoic acid, the repeating unit in the polymeric structure consists of two identical irregular KO6Cl units related by twofold rotational symmetry, linked by a bridging water molecule lying on the twofold axis. The coordination polyhedron about the K+ ion comprises a carboxylate O atom and a Cl-atom donor from a bidentate chelate ligand interaction, four O-atom donors from a doubly bridging bidentate carboxylate O,O0-chelate interaction and the water molecule. A two-dimensional polymeric structure lying parallel to (100) is generated through a series of conjoined cyclic bridges between K+ ions and is stabilized by water–carboxylate O—H O hydrogen-bonding interactions. Related literature For the structures of potassium salts with coordinating carbon-bound Cl ligands, see: Gowda et al. (2007); Molčanov et al. (2011). For an analogous complex with a Cs—Cl bond in