Disodium tris(dioxidomolybdenum) bis(diarsenate)

Abstract

The asymmetric unit of the title compound, Na2(MoO2)3(As2O7)2, is composed of two cyclic MoAs2O11units and an MoO6corner-sharing octahedron. The anionic framework can be decomposed into two types of layers,viz.MoO2As2O7and Mo2As2O14, which use mixed Mo—O—As and As—O—Mo bridges to achieve a new three-dimensional structure with two types of large channels in which the Na+cations are located. Two O atoms are disordered and are located in two positions close to their initial positions with occupancy ratios of 0.612 (17):0.388 (17) and 0.703 (12):0.298 (12).