The title compound, Na 6 H 3 [SmW 10 O 36 ].28H 2 O, coexists of a decatungstosamarate anion, six fivefold- or sixfold-coordinated Na + cation and water molecules of crystallization. The decatungstosamarate anion is comprised of two [W 5 O 18 ] 6- moieties chelating to a central Sm 3+ cation, which has tetragonal antiprismatic coordination with D 4 symmetry and Sm-O distances of 2.41-2.46 A
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Ozeki et al. (1994) studied this question.