Penta­kis(tetra­ethyl­ammonium) diaqua-μ₄-malonato-tetra­malonatodi-μ₃-oxo-di-μ-oxo-tetra­oxo­potassium­tetramolybdenum acetonitrile disolvate

The title compound, (C₈H₂₀N)₅[KMo₄O₈(C₃H₂O₄)₅]·2CH₃CN·2H₂O, was obtained from a ligand substitution reaction of [Et₄N]₃[Mo₃(CO)₉(OMe)₃] with malonic acid and subsequent reaction with oxygen and water. The structure contains two Mo⁵⁺ dimers bridged by a malonate group. Each Mo atom is ligated by an additional chelating malonate group, a terminal oxide and two bridging oxides. A potassium ion occupies the cavity formed by the bridging malonate group.

Tris(tetra­ethyl­ammonium) μ-3-hydroxy­propanolato-di-μ-methoxo-bis­[tricarbonyl­tungsten(0)]

In the crystal structure of the title compound, (C₈H₂₀N)₃[W₂(CH₃O)₂(C₃H₇O₂)(CO)₆], obtained from a ligand substitution reaction of (Et₄N)₃[W₂(OMe)₃(CO)₆], the trianion sits across a mirror plane such that one W(CO)₃ group is unique and the two meth­oxy groups and all but the middle C atom of the 3-hydroxy­propanolate ligand lie on the mirror plane. One and a half mol­ecules of the tetra­ethyl­ammonium cation are present to balance the charge in the asymmetric unit. The half mol­ecule is situated with its N atom on a mirror plane and is disordered.