Mg(2)Na(2)V(10)O(28).20H(2)O and Mg(3)V(10)O(28).28H(2)O.
The crystal structures of dimagnesium disodium decavanadate icosahydrate, Mg(2)Na(2)V(10)O(28).20H(2)O, (I), and trimagnesium decavanadate octacosahydrate, Mg(3)V(10)O(28).28H(2)O, (II), have been determined by single-crystal X-ray diffraction. They crystallize with monoclinic (C2/c) and triclinic (P-1) symmetry, respectively. All the Mg(2+) cations in (I) and (II) are octahedrally coordinated by six water molecules. The Na(+) cations in (I) are coordinated by three water molecules and three O atoms of the decavanadate anions, and link the latter into a three-dimensional network. The decavanadate anions in (II) are not linked to one another.
Iida
Akifumi
A
Department of Chemistry and Materials Science, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8551, Japan.
Ozeki
Tomoji
T