Abstract
The title compound, lithium/sodium iron(III) bis[orthomolybdate(VI)], was obtained by a solid-state reaction. The main structure units are an FeO6 octahedron, a distorted MoO6 octahedron and an MoO4 tetrahedron sharing corners. The crystal structure is composed of infinite double MoFeO11 chains along the b-axis direction linked by corner-sharing to MoO4 tetrahedra so as to form Fe2Mo3O19 ribbons. The cohesion between ribbons via mixed Mo—O—Fe bridges leads to layers arranged parallel to the bc plane. Adjacent layers are linked by corners shared between MoO4 tetrahedra of one layer and FeO6 octahedra of the other layer. The Na+ and Li+ ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made with AFe(MoO4)2 (A = Li, Na, K and Cs) structures.
Highlights
The title compound, lithium/sodium iron(III) bis[orthomolybdate(VI)], was obtained by a solid-state reaction
The crystal structure is composed of infinite double MoFeO11 chains along the b-axis direction linked by corner-sharing to MoO4 tetrahedra so as to form Fe2Mo3O19 ribbons
The cohesion between ribbons via mixed Mo—O—Fe bridges leads to layers arranged parallel to the bc plane
Summary
Key indicators: single-crystal X-ray study; T = 298 K; mean (Mo–O) = 0.003 A; disorder in main residue; R factor = 0.020; wR factor = 0.051; data-to-parameter ratio = 12.8. The main structure units are an FeO6 octahedron, a distorted MoO6 octahedron and an MoO4 tetrahedron sharing corners. The crystal structure is composed of infinite double MoFeO11 chains along the b-axis direction linked by corner-sharing to MoO4 tetrahedra so as to form Fe2Mo3O19 ribbons. Adjacent layers are linked by corners shared between MoO4 tetrahedra of one layer and FeO6 octahedra of the other layer. The Na+ and Li+ ions partially occupy the same general position, with a site-occupancy ratio of 0.631 (9):0.369 (1). A comparison is made with AFe(MoO4) (A = Li, Na, K and Cs) structures
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