Acta Crystallographica Section E

Structure Reports Online

Volume 61, Part 3 (March 2005)

inorganic compounds


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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.

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