SODIUM HETEROPOLYHEXAMOLYBDENUMNICKELATE (II) Na4[Ni(OH)6Mo6O18]·16H2O WITH AN ANDERSON ANION: SYNTHESIS AND CRYSTAL STRUCTURE
N. I. Gumerova1, N. A. Melnik1, G. M. Rozantsev1, V. N. Baumer2,3, S. V. Radio1
1Donetsk National University, Vinnytsia, Ukraine
2Institute for Single Crystals, National Academy of Sciences of Ukraine, Kharkiv, Ukraine
3Karazin Kharkiv National University, Kharkiv, Ukraine
Keywords: гетерополисоединение, молибдат, структура Андерсона, кристаллическая структура, рентгеноструктурный анализ, heteropolycompound, molybdate, Anderson structure, crystal structure, single crystal X-ray diffraction
Abstract
Conditions are determined for the formation of sodium heteropolyhexamolybdenumnickelate(II) Na
4[Ni(OH)
6Мо
6O
18]·16H
2O (I) in a Ni(NO
3)
2-Na
2МоO
4-HNO
3-H
2O solution acidified to
Z = ν(H
+)/ν(МоO ) = 1.00. Synthesized salt I is investigated by chemical analysis, single crystal XRD, powder XRD, thermal analysis, and IR spectroscopy. The heteropolyanion is shown to belong to the Anderson type. Compound I is analyzed by single crystal XRD (
M
r = 1404.61, triclinic, space group
P ,
a = 8.0586(4) Å,
b = 10.5445(6) Å,
c = 12.1374(5) Å, α= 69.557(5)Å, β = 70.604(4)Å, γ = 84.123(4)Å,
V = 911.45(8) Å
3) to find that it is isostructural to Na
4[Ni(OH)
6W
6O
18]·16H
2O. All metal atoms in the structure of I are in an octahedral environment: the coordination sphere of the Ni heteroatom consists of OH groups; that of Mo consists of O atoms and OH groups; Na atoms are linked to the heteropolyanion via the terminal O atoms of the polyanion and surrounded by water molecules. In the crystal packing, the [Ni(OH)
6Mo
6O
18]
4- anions lie in planes parallel to (1 0) and the polyanion layers alternate with those formed by the paired octahedra [Na
2(μ-H
2O)
2(H
2O)
6(O)
2] in the direction of the
y axis.
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