Abstract
A new Mo(V) monophosphate BaMo4O8(PO4)2, with a layer structure, has been isolated. It crystallizes in the space group I4̄m , with a = 7.475(1) Å and c = 11.156(1) Å. The close relationships between the structure of this phase and that of the mixed-valent Mo(III)-Mo(IV) phosphate Cs3(MoO)4(PO4)3 are remarkable. Both phosphates are characterized by Mo4O16 octahedral units built up from Mo4O6+4 cubes, forming identical [Mo4P2O16]∞ layers parallel to (001). The layer structure of the present Mo(V) monophosphate derives from the intersecting tunnel framework of the intermediate valent Mo monophosphate by just suppressing the PO4 tetrahedra along one direction and by translating two successive [Mo4P2O16]∞ layers by (a + b)/2.
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