Acta Crystallographica Section C

Crystal Structure Communications

Volume 61, Part 11 (November 2005)

inorganic compounds

Acta Cryst. (2005). C61, i111-i112 [doi:10.1107/S0108270105025242]

The K_2nCoMo_2+nO_7+4n family of structures, with n = 2, 3 or 5

J. M. Engel, H. Ehrenberg and H. Fuess

Abstract: The compounds K₄CoMo₄O₁₅ (tetrapotassium cobalt tetramolybdate), K₆CoMo₅O₁₉ (hexapotassium cobalt pentamolybdate) and K₁₀CoMo₇O₂₇ (decapotassium cobalt heptamolybdate) belong to a series of compounds with closely related crystal structures. In K₄CoMo₄O₁₅, the Co atom and one of the two unique Mo atoms are at sites with threefold symmetry; two of the three unique K atoms lie at sites with $\overline{3}$ symmetry. K₆CoMo₅O₁₉ crystallizes in a new monoclinic structure type. Each [CoO₆] octahedron is surrounded by one face-sharing [MoO₆] octahedron and six corner-sharing [MoO₄] tetrahedra. All three compounds have this structural unit in common, but differ in the degree of connectivity between these units. They form layers in K₄CoMo₄O₁₅ and zigzag chains in K₆CoMo₅O₁₉, both by sharing [MoO₄] tetrahedra. In K₁₀CoMo₇O₂₇, the structural units are isolated from each other.

Formula: K₄CoMo₄O₁₅ and K₆CoMo₅O₁₉


	Structure factor file (CIF format) (65.1 kbytes) Contains datablock I

	Structure factor file (CIF format) (270.4 kbytes) Contains datablock II

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