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The crystal structure of PrMosO~4 contains a mixture of cis-edge-sharing and trans bi-face-capped octahedral Mo8 clusters in the ratio 2

The crystal structure of cerium octamolybdate, CeMo8Ol4, contains a mixture of cis-edge-sharing and trans bicapped octahedral Mo8 clusters in equal proportions. The Mo8 clusters and the O atoms form layers parallel to the bc plane of the orthorhombic unit cell. The arrangement of the O atoms derives from a close packing with the layer sequence ABAC... The Mo--Mo distances range from 2.5825 (9) to 2.778 (1)/~ and from 2.5958 (8) to 2.886 (2)/~ in the trans and cisedge-sharing isomeric clusters, respectively. The shortest Mo---Mo distance between Mo8 clusters within the same layer is 3.0790 (9)/~, and that between clusters of adjacent layers is 3.635 (1)/~. The Mo---4) distances are between 2.027(6) and 2.110(7)A in the trans isomer and between 1.944 (5) and 2.169 (5)/~ in the cis-edgesharing isomer. The environment of each of the two crystallographically independent Ce 3+ ions is constituted by 12 O atoms forming a distorted cuboctahedron. The Ce--O distances lie between 2.569 ~6) and 2.920 (5)/~ and between 2.442 (7) and 2.943 (6) A for the Ce(1) and Ce(2) sites, respectively.

structure structure (solids and liquids) D 2000 -007LaMo8O14.-Single crystals of the title compound are prepared by reaction of a stoichiometric mixture of La2O3, MoO3 and Mo at 2220 K (Mo crucible, 15 min). LaMo8O14 crystallizes in the orthorhombic space group Pbcn with Z = 8. The structure is characterized by layers in which trans biface-capped and cis-edge-sharing bi-face-capped Mo8 octahedra are present in equal amounts. -(KERIHUEL, G.; TORTELIER, J.; GOUGEON, P.; Acta Crystallogr., Sect. C: Cryst.

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