Acta Cryst. (2005). E61, i28-i31  [ doi:10.1107/S1600536805003557 ]

A lanthanum(III) complex with a lacunary polyoxotungstate: Na₂(NH₄)₇[La(W₅O₁₈)₂]·16H₂O

F. A. Almeida Paz, M. S. S. Balula, A. M. V. Cavaleiro, J. Klinowski and H. I. S. Nogueira

Abstract: The crystal structure of a lanthanum polyoxotungstate complex, viz. heptaammonium disodium decatungstolanthanate hexadecahydrate, Na₂(NH₄)₇[La<(W₅O₁₈)₂]·16H₂O, has been determined by single-crystal X-ray diffraction at 100  (2)  K in the space group C2/c. The [La(W₅O₁₈)₂]^9- polyoxoanion has the central La³⁺ cation located on a twofold rotation axis. The close packing of the polyoxoanion-supported lanthanum(III) complexes with Na⁺ and NH₄⁺ cations leads to the formation of several intersecting undulating channels, where the water molecules of crystallization are located and involved in strong hydrogen bonds.

Online 12 February 2005

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