Abstract
The crystal structure of the title compound {systematic name: octa-μ3-hydroxido-μ6-oxido-hexa-kis-[tetra-aqua-yttrium(III)] octa-iodide octa-hydrate}, is characterized by the presence of the centrosymmetric mol-ecular entity [Y6(μ6-O)(μ3-OH)8(H2O)24](8+), in which the six Y(3+) cations are arranged octa-hedrally around a μ6-O atom at the centre of the cationic complex. Each of the eight faces of the Y6 octa-hedron is capped by an μ3-OH group in the form of a distorted cube. In the hexa-nuclear entity, the Y(3+) cations are coordinated by the central μ6-O atom, the O atoms of four μ3-OH and of four water mol-ecules. The resulting coordination sphere of the metal ions is a capped square-anti-prism. The crystal packing is quite similar to that of the ortho-rhom-bic [Ln 6(μ6-O)(μ3-OH)8(H2O)24]I8·8H2O structures with Ln = La-Nd, Eu-Tb, Dy, except that the title compound exhibits a slight monoclinic distortion. The proximity of the cationic complexes and the lattice water mol-ecules leads to the formation of a three-dimensional hydrogen-bonded network of medium strength.
Highlights
INSA, UMR 6226, Institut des Sciences Chimiques de Rennes, 35 708 Rennes, France. *Correspondence e-mail: The crystal structure of the title compound {systematic name: octa-3hydroxido-6-oxido-hexakis[tetraaquayttrium(III)] octaiodide octahydrate}, is characterized by the presence of the centrosymmetric molecular entity [Y6(6O)(3-OH)8(H2O)24]8+, in which the six Y3+ cations are arranged octahedrally around a 6-O atom at the centre of the cationic complex
The Y3+ cations are coordinated by the central 6-O atom, the O atoms of four 3-OH and of four water molecules
The proximity of the cationic complexes and the lattice water molecules leads to the formation of a three-dimensional hydrogen-bonded network of medium strength
Summary
Rare-earth-based oxido-hydroxido polynuclear complexes are of interest because of their unique luminescence (Chen et al., 2010; Le Natur et al, 2013; Petit et al, 2009), magnetic properties (Abbas et al, 2010; Xu et al, 2011) or structural characteristics (Zheng, 2001; Andrews et al, 2013). Since the pioneering work of Zak et al (1994), we have developed a systematic synthetic procedure for the nitrate counter-anion complex with most of the rare earth elements (Calvez et al, 2008, 2010). In this context, we have undertaken the study of a series of complexes based on the iodide counteranion which have never been obtained with heavier rare earth ions. We report here the synthesis and crystal structure of the yttrium derivative
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