K₂MoO₂As₂O₇

The dipotassium molybdyl diarsenate(4-) structure is built up from MoO₆ octahedra and As₂O₇ groups sharing corners to form layers. The two O atoms of the molybdyl group remain unshared with short Mo-O distances (average 1.704 Å). The K⁺ ions are located in the interlayer space. A relationship is found between the two-dimensional structure of the title compound and the three-dimensional melilite structure.

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