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The crystal and molecular structure of bis(tetramethylammonium) pentachlorooxomolybdate(V)‐acetonitrile(1:1)

The crystal structure of the title compound, C10H27Cl5MoN3O was determined by single crystal X‐ray diffraction technique. The crystals are monoclinic, space group C 2/m, with a= 29.075(8) Å, b= 11.843(4) Å, c= 13.252(4) Å, β=117.049(7)°, V = 4064(2) Å3, Z=8. The structure was solved by direct methods and refined by least‐squares methods to a final R = 0.0307 for 5095 observed reflections with I>2σ(I). In the pentachlorooxomolybdate anion, the planar chlorines are bent away from the axial oxygen ligand. The Mo‐O bond length is 1.6620(18) Å that indicates significant double bond character. The oxygen trans Mo‐Cl bond is significantly longer than all of the planar Mo‐Cl bonds. These differences can be attributed to a trans influence of the oxygen atom. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)