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The title compound, {[Ba 7 (C 3 H 5 O 2 ) 14 ]·0.946C 3 H 6 O 2 ·4H 2 O}  n  , is represented by a metal-organic framework structure that is held together by Ba-O-Ba bonds, as well as by O-H⋯O hydrogen bonds of moderate strength. The structure comprises of four independent Ba 2+ cations (one of which is situated on a twofold rotation axis), seven independent propionate and two independent water mol-ecules. The bond-valence sums of all the cations indicate a slight overbonding. There is also an occupationally, as well as a positionally disordered propionic acid mol-ecule present in the structure. Its occupation is slightly lower than the full occupation while the disordered mol-ecules occupy two positions related by a rotation about a twofold rotation axis. In addition, the methyl group in the symmetry-independent propionic acid mol-ecule is also disordered, and occupies two positions. Each propionic acid mol-ecule coordinates to just one cation from a pair of symmetry-equivalent Ba 2+ sites and is simultaneously bonded by an O-H⋯O propionate hydrogen bond. This means that on a microscopic scale, the coordination number of the corresponding Ba 2+ site is either 9 or 10. The methyl as well as hy-droxy hydrogen atoms of the disordered propionic acid mol-ecule were not determined.

Poly[[tetradecakis(μ-propionato)heptabarium] propionic acid monosolvate tetrahydrate]