Synthesis and characterization of the Anderson–Evans tungsto­anti­monate [Na(5)(H(2)O)(18){(HOCH(2))(2)CHNH(3)}(2)][SbW(6)O(24)]

A novel tungsto­anti­monate, [Na(5)(H(2)O)(18){(HOCH(2))(2)CHNH(3)}(2)][Sb(V)W(VI) (6)O(24)] (SbW(6) ), was synthesized from an aqueous solution and structurally characterized by single-crystal X-ray diffraction, which revealed C2/c symmetry. The structure contains two serinol [(HOCH(2))(2)CHNH(3)](+) and five Na(+) cations, which are octa­hedrally surrounded by 18 water mol­ecules, and one [Sb(V)W(VI) (6)O(24)](7−) anion. The serinol mol­ecules also play a critical role in the synthesis by acting as a mild buffering agent. Each of the W(VI) and Sb(V) ions is six-coordinated and displays a distorted octa­hedral motif. A three-dimensional supra­molecular framework is formed via hydrogen-bonding inter­actions between the tungsto­anti­monates and cations. Powder X-ray diffraction, elemental analysis, thermogravimetric analy­sis and IR spectroscopy were performed on SbW(6) to prove the purity, to identify the water content and to characterize the vibrational modes of the crystallized phase.