Novel Tungsten, Molybdenum, and Vanadium Oxides Containing Surfactant Ions

TLDR: In this paper, a combination of tungstic acid, molybdenum and vanadium pentoxide with the surfactant template dodecyltrimethylammonium bromide (DTABr) yielded one compound with a Keggin type structure, [C12H25N(CH3)3]6(H2W12O40)·xH2O, and two new layered compounds.

Abstract: Hydrothermal reaction of tungstic acid, molybdic acid, and vanadium pentoxide with the surfactant template dodecyltrimethylammonium bromide (DTABr) yielded one compound with a Keggin type structure, [C12H25N(CH3)3]6(H2W12O40)·xH2O, and two new layered compounds, [C12H25N(CH3)3]0.5(MoO3.25) and [C12H25N(CH3)3]2/3V2O5.33·H2O. The tungsten salt produced needlelike crystals of a hexagonal shape while the molybdenum and vanadium salts formed layered structures. FTIR analysis of the tungsten salt was consistent with materials containing Keggin anions. The X-ray powder diffraction data of this material were indexed to a monoclinic cell with a = 50.56(4) A, b = 54.41(4) A, c = 13.12(1) A, and β = 99.21°. The observed reflections are consistent with space group C2/m. Diffraction data obtained from the molybdenum salt showed a between layer d spacing of ca. 22 A. The vanadium salt was indexed to a triclinic cell with a = 9.813(3) A, b = 11.512(3) A, c = 21.725(5) A, α = 95.30(1)°, β = 93.82(6)°, and γ = 101.12(8)°,...