Acta Cryst. (2008). E64, m1280-m1281  [ doi:10.1107/S1600536808029243 ]

Tricaesium tris(pyridine-2,6-dicarboxylato-³O²,N,O⁶)lutetium(III) octahydrate

V. Legrand, F. Aubert, A. D'Aléo, P. Rabiller and O. Maury

Abstract: Colourless block crystals of the title compound, Cs₃[Lu(dipic)₃]·8H₂O [dipic is dipicolinate or pyridine-2,6-dicarboxylate, C₇H₃NO₄] were synthesized by slow evaporation of the solvent. The crystal structure of this Lu^III-complex, isostructural with the Dy^III and Eu^III complexes, was determined from a crystal twinned by inversion and consists of discrete [Lu(dipic)₃]^3- anions, Cs⁺ cations and water molecules involving hydrogen bonding. The Lu atom lies on a twofold rotation axis and is coordinated by six O atoms and three N atoms of three dipicolinate ligands. One Cs atom is also on a twofold axis. The unit cell can be regarded as successive layers along the crystallographic c-axis formed by [Lu(dipic)₃]^3- anionic planes and [Cs⁺, H₂O] cationic planes. In the crystal structure, although the H atoms attached to water molecules could not be located, short O-O contacts clearly indicate the occurrence of an intricate hydrogen-bonded network through contacts with other water molecules, Cs cations or with the O atoms of the dipicolinate ligands.

Online 20 September 2008

Copyright © International Union of Crystallography
IUCr Webmaster