Abstract: | The title compound, {Ba3(CHCl2O6P2)2(H2O)4]·H2O}n or {Ba3(Cl2CP2O6H)(H2O)4]·H2O}n, is two‐dimensional. The asymmetric unit contains three independent Ba2+ atoms, two chelating and bridging Cl2CP2O6H3− ligands and four aqua ligands, connected in layers parallel to the (100) plane. There are pores between the layers in the direction of the b axis filled with lattice water molecules. |