Butane-1,4-diammonium diphospho­pentamolybdate: a new inorganic-organic hybrid solid

A new inorganic-organic hybrid, bis(utane-1,4-diammonium) bis(hydrogenphosphato)­penta­molybdate monohydrate, (C₄H₁₄N₂)₂[Mo₅O₁₅(H₂PO₄)₂]·H₂O, has been determined. The structure contains the molecular ion [Mo₅O₁₅(HPO₄)₂]^4- built of an Mo₅ oxo-anion ring capped by two protonated PO₄ tetrahedra linked by means of edge and corner sharing. A complex hydrogen-bonding network involving interactions between the organic counter-cation sand inorganic anions is observed.