Abstract
Acid pyridine-3-carboxylic acid dodecatungstenphosphate (C6NO2H5)2H[PW12O40]·2H2O is synthesized. The compound is studied by chemical analysis, IR spectroscopy, X-ray crystallography, and thermogravimetry. The compound is found to crystallize at 290 K in a hexagonal crystal system (space group \(R\bar 3\)) (I) with the unit cell parameters: a = 33.015(6) Å, c = 12.010(2) Å, γ = 120°, V = 11337(4) Å3, Z = 9. When the temperature decreases to 100 K, a phase transition is observed leading to an increase in symmetry to \(R\bar 3m\) (II), with the unit cell parameters: a = 33.072(1) Å, c = 24.234(1) Å, γ = 120°, V = 22955(2) Å3, Z = 18.
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Original Russian Text © 2014 G. Z. Kaziev, O. A. Kirichenko, A. I. Stash, Saul H. Quinones, E. A. Solov’eva, Y. S. Chen.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 55, No. 4, pp. 708–715, July–August, 2014.
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Kaziev, G.Z., Kirichenko, O.A., Stash, A.I. et al. Study of acid pyridine-3-carboxylic acid dodecatungstenphosphate of the composition (C6NO2H5)2H[PW12O40]·2H2O. J Struct Chem 55, 674–681 (2014). https://doi.org/10.1134/S002247661404012X
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DOI: https://doi.org/10.1134/S002247661404012X