Preparation and crystal structure of tungstogallate acid H5GaW12O40

The heteropoly tungstogallate acid H5GaW12O40 has been synthesized and characterized. Colorless octahedral crystals of the title compound were crystallized from acetonitrile with formula H5GaW12O40. The single crystal X-ray structure analysis of the title compound revealed that it crystallized in monoclinic system, space group Cm with a = 17.691 (4) A, b = 25.065 (5) A, c = 15.315 (3) A, β = 125.21 (3)°, V= 5548.5 (19) A3, and Z = 2. The crystal consists of the heteropolyanion GaW12O 40 5− and H+ cations. The heteropolyanion GaW12O 40 5− is an independent unit and assumed to have the Keggin structure.