Details

Autor(en) / Beteiligte

• Schustereit, Tanja
• Schleid, Thomas
• Hartenbach, Ingo

Titel

Ce2[MoO5][MoO4] and Ce5[MoO4]8: Two New Cerium Oxomolybdates, Each Exhibiting a Special Structural Feature

Ist Teil von

• Zeitschrift für Naturforschung. B, A journal of chemical sciences, 2011-08, Vol.66 (8), p.763-770

Ort / Verlag

Verlag der Zeitschrift für Naturforschung

Erscheinungsjahr

2011

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ce [MoO ][MoO ] crystallizes monoclinically in space group P2 (a = 2241.98(9), b = 712.95(3), c = 2044.19(8) pm, β = 116.936(2), Z = 16). Besides eight crystallographically different Ce cations with coordination numbers ranging from seven plus one to ten, its structure contains two isolated oxomolybdate(VI) species, namely [MoO tetrahedra and [MoO trigonal bipyramids and square pyramids. The oxygen polyhedra around the Ce cations build up a three-dimensional {[Ce } network by vertex-, edge-, and face-connections with the Mo cations residing in tetrahedral, square-pyramidal, and trigonal-bipyramidal voids therein. Ce5[MoO4]8 also crystallizes monoclinically in space group P2 (a = 1133.14(5), b = 1704.96(7), c = 1406.21(6) pm, β = 90.749(2)° Z = 4). In its structure eight isolated [MoO tetrahedra are present, which display an overall negative charge of −16. To maintain electroneutrality, mixed-valency of the five crystallographically independent cerium cations must be considered. A thorough bond-valence analysis reveals cerium at the Ce1 site as tetravalent, while the other four cerium cations prove to be trivalent. The polyhedra around all cerium cations form chains with a V-shaped profile along [100] via vertex-, edge-, and face-connections to result in a sawblade pattern. These chains are interlocked into sheets parallel to the (001) plane and linked by the Mo cations to form a three-dimensional network.