LiNa₅Mo₉O₃₀

The tite compound, lithium penta­sodium nona­molybdate, LiNa₅Mo₉O₃₀, was synthesized by solid-state reaction. The three-dimensional [Mo₉O₃₀]^6- framework is built up from MoO₆ octa­hedra and MoO₅ bipyramids, linked together by edges and corners. The framework delimits two types of inter­secting tunnels running along [100] and [010] in which the Na⁺ and Li⁺ ions are located. The asymmetric unit contains one Mo, one Na and one Li site located on a twofold rotation axis. The crystal studied was a racemic twin with site a twin ratio of 0.51 (10):0.49 (10). Relationships between the structures of K₂Mo₃O₁₀, K₂Mo₄O₁₃, Cs₂Mo₇O₂₂, Na₆Mo₁₀O₃₃ and Na₆Mo₁₁O₃₆ compounds are discussed.

Li_0.17Na_5.83Mo₁₁O₃₆

The title mixed-alkali-metal molybdenium oxide, hexa­kis­(lithium/sodium) undeca­molybdate, was synthesized by solid-state reaction at 793 K. Its [Mo₁₁O₃₆]^6- framework is built up from MoO₆ octa­hedra and MoO₅ pyramids linked together by edges and vertices. The framework delimits two types of inter­secting tunnels running along [100] and [001], where the sodium and lithium ions are located. Two of the sodium ions and the lithium ion have fractional site occupancies. One of the Mo atoms has site symmetry 2, one sodium ion has site symmetry 2 and one has site symmetry -1, and the Li⁺ ion has site symmetry 2. Structural relationships between the title compound and the anatase and Na₆Mo₁₁O₃₆ structures are discussed.