Synthesis, crystal structure and infrared and Raman spectra of a sodium barium orthoarsenate (V) nonahydrate NaBaAsO4(H2O)9

Crystals of a sodium barium orthoarsenate (V) nonahydrate were synthesized by slow evaporation from aqueous solutions. The crystal structure was solved and refined by single-crystal X-ray diffraction. The crystal is cubic, space group P213, a = 10.838(2) Å; Z = 4 and V = 1273.1(2) Å3. Its structure is composed of BaO9 and NaO6 polyhedra and AsO4 tetrahedral units. The short hydrogen bond length O4H42⋯O2B of 2.496 Å was confirmed by infrared spectroscopy. In addition, Raman spectrum was recorded in order to study the arsenate group and the cation motion (lattice modes) in the title compound.