A lanthanum(III) complex with a lacunary polyoxotungstate: Na-2(NH4)(7)[La(W5O18)(2)]center dot 16H(2)O

abstract

The crystal structure of a lanthanum polyoxotungstate complex, viz. heptaammonium disodium decatungstolanthanate hexadecahydrate, Na-2(NH4)(7)[La5O(18))(2)].16H(2)O, 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.

keywords

CRYSTAL-STRUCTURE; HETEROPOLYTUNGSTATE COMPLEXES; ANIONS; HETEROPOLYOXOTUNGSTATE; ELEMENTS

subject category

Crystallography

authors

Paz, FAA; Balula, MSS; Cavaleiro, AMV; Klinowski, J; Nogueira, HIS

our authors

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