Abstract
A new mixed valent molybdenum monophosphate, Cs3Mo8O11(PO4)8, with a tunnel structure, has been synthesized. It crystallizes in the space group C2/m with a=20.203 (2) Å, b=6.370 (1) Å, c=14.379 (1) Å and β=99.827 (7)°. Its [Mo8P8O43]∞ 3D-framework consists of single phosphate groups, single MoO6 octahedra, and bioctahedral units of corner-sharing octahedra Mo2O11 and of edge-sharing octahedra Mo2O10. The entire host lattice can be described by the association of [MoPO8]∞ chains running along b, through the corners of their octahedra and tetrahedra, and through the edges of their octahedra, forming large tunnels running along b where the Cs+ cations are located. Bond valence calculations show that in the bioctahedral units, the electrons are delocalized between the two Mo atoms.
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