Abstract
In the structure of the title complex, [Cs(C7H4NO2)(H2O)2] n , the caesium salt of 4-nitro-benzoic acid, the irregular CsO9 coordination sphere comprises three bridging nitro O-atom donors, a bidentate carboxyl-ate O,O'-chelate inter-action, a triple-bridging water mol-ecule and a monodentate water mol-ecule. A three-dimensional framework polymer is generated, within which there are water-carboxyl-ate O-H⋯O and water-water O-H⋯O hydrogen-bonding inter-actions.