Acta Cryst. (2002). E58, i62-i64  [ doi:10.1107/S1600536802010334 ]

Gd₄Mo₇O₂₇, a novel phase in the Gd₂O₃-MoO₃ system

H. Naruke and T. Yamase

Abstract: The title compound, heptamolybdenum(VI) tetragadolinate(III), a novel phase in the the Gd₂O₃-MoO₃ system, has been prepared by pyrolysis of [Gd₂(H₂O)₁₂Mo₈O₂₇]·8H₂O at 1023  K for 2  h in air. The compound can be described as a layer structure consisting of {MoO₄}-, {Mo₃O₁₁}- and {Gd}-containing layers, which are stacked along the a direction. The {Mo₃O₁₁} group is composed of trigonal bipyramidal MoO₅ connected to two MoO₄ tetrahedra, with corner-sharing. The coordination polyhedra of square-antiprismatic GdO₈ and monocapped trigonal prismatic GdO₇ are dimerized to give {Gd₂O_n} (n = 12 and 13) groups which possess short GdGd separations [3.6345  (4)-3.6404  (4)  Å].

Online 21 June 2002

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