The structure of 18-molybdodisulphate(VI)(4–) ion in (NEt4)4S2Mo18O62·CH3CN

Abstract

The structure of (NEt₄)₄S₂Mo₁₈,O₆₂·CH₃CN has been determined by the single-crystal X-ray method. The crystals are triclinic, space group P, with cell parameters a= 15.062(4), b= 23.296(4), c= 13.813(4)Å, and α= 97.66(4), β= 115.98(2), γ= 84.63(4)°, and Z= 2. The structure model was refined by full-matrix least squares to R′= 0.063 for 1 1 700 reflections with F_o > 3σ(F). The existence of the [S₂Mo₁₈O₆₂]^4– heteropolyanion in the crystals has been confirmed. It is composed of two SO₄ tetrahedra and eighteen MoO₆ octahedra linked to give the Dawson α-[P₂W₁₈O₆₂]^6– structure. The anions are separated by NEt₄⁺ cations and CH₃CN solvate molecules.