Acta Cryst. (2012). E68, i93
[ doi:10.1107/S1600536812048167 ]

Na₂MoO₂As₂O₇

R. Jouini, M. F. Zid and A. Driss

Abstract: Disodium molybdenum dioxide diarsenate, Na₂MoO₂As₂O₇, has been synthesized by a solid-state reaction. The structure is built up from MoAs₂O₁₂ linear units sharing corners to form a three-dimensional framework containing tunnels running along the a-axis direction in which the Na⁺ cations are located. In this framework, the As^V atoms are tetrahedrally coordinated and form an As₂O₇ group. The Mo^VI atom is displaced from the center of an octahedron of O atoms. Two Na⁺ cations are disordered about inversion centres. Structural relationships between different compounds: A₂MoO₂As₂O₇ (A = K, Rb), AMOP₂O₇ (A = Na, K, Rb; M = Mo, Nb) and MoP₂O₇ are discussed.

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