Date Published: March 01, 2012
Publisher: International Union of Crystallography
Author(s): Patrick Gougeon, Philippe Gall.
The structure of lithium nonacerium hexadecamolybdenum pentatridecaoxide, LiCe9Mo16O35, is isotypic with LiNd9Mo16O35 [Gougeon Gall, Cuny, Gautier, Le Polles, Delevoye & Trebosc (2011 ▶). Chem. Eur. J.17, 13806–13813]. It is characterized by Mo16O26iO10a units (where i = inner and a = apical) containing Mo16 clusters that share some of their O atoms to form infinite molybdenum cluster chains running parallel to the b axis and separated by Li+ and Ce3+ cations. The Mo16 cluster units are centred at Wyckoff positions 2c and have point-group symmetry 2/m. The Li+ atom, in a flattened octahedron of O atoms, is in a 2a Wyckoff position with 2/m symmetry. The Ce3+ cations have coordination numbers to the O atoms of 6, 9 or 10. Two Ce, two Mo and five O atoms lie on sites with m symmetry (Wyckoff site 4i), and one Ce and one O atom on sites with 2/m symmetry (Wyckoff sites 2b and 2d, respectively).
For the crystal structure of the LiNd9Mo16O35 compound, see: Gougeon et al. (2011 ▶). For details of the i- and a-type ligand notation, see: Schäfer & von Schnering (1964 ▶). For compounds containing Mo10 clusters, see: Hibble et al. (1988 ▶); Dronskowski & Simon (1989 ▶); Gougeon et al. (1990 ▶, 1991 ▶, 2003 ▶, 2007 ▶); Dronskowski et al. (1991 ▶); Gall et al. (1993 ▶, 1995 ▶, 1999 ▶); Gall & Gougeon (1993 ▶, 1994a ▶,b ▶, 1998 ▶); Gougeon & Gall (2002 ▶). The oxidation states of the Mo, Ce and Li atoms were estimated using the data given by Brown & Wu (1976 ▶).