Tetrakis(triethylammonium) Octamolybdate(VI) Dihydrate

The X-ray structure analysis of the title compound, (C₆H₁₆N)₄[Mo₈O₂₆].2H₂O, has confirmed the presence of the [Mo₈O₂₆]⁴⁻ anion. Eight edge- and corner-sharing MoO₆ octahedra constitute the anion, which has short terminal Mo—O bonds [1.684 (3)–1.711 (3) Å], bonds of intermediate length [1.749 (3)–1.990 (3) Å] and long bonds [2.140 (2)–2.472 (3) Å]. The structure consists of β-Mo₈O₂₆ polyanions, triethylammonium cations and water molecules of crystallization. The water molecules and triethylammonium cations are linked to the terminal and bridging O atoms of the anion by hydrogen bonds. Hydrogen bonds also exist between the water molecules and the triethylammonium cations.

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