Abstract
For the first time, the fluoridotantalates(V) with the mono- and diprotonated 4-amino-1,2,4-triazolium cation of the heterocyclic base (C2H5N4)2TaF7 and (C2H6N4)TaF7•H2O, are synthesized and their crystal structures are determined. The orthorhombic crystals of (C2H5N4)2TaF7 (space group Cmc21) are formed of complex [TaF7]2– anions with the configuration of monocap trigonal prism and the monoprotonated (C2H5N4)+ cations, one of which is statistically disordered. The crystal structure of (C2H6N4)TaF7•H2O (space group Pna21) consists of the pentagonal bipyramidal complex [TaF7]2– anions, the diprotonated (C2H6N4)2+ cations, and the molecules of crystallization H2O. In the structure of I, the (C2H5N4)+ cations simultaneously exist as cis- and trans-conformers. The formation of the diprotonated 4-amino-1,2,4-triazolium cation (C2H6N4)2+ was revealed for the first time. Via ionic interactions and N–H•••F, N–H•••N, and O–H•••F hydrogen bonds, the units in I and II are arranged in a three-dimensional structure.
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Original Russian Text © 2015 A. A. Udovenko, R. L. Davidovich, V. B. Logvinova.
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Translated from Zhurnal Strukturnoi Khimii, Vol. 56, No. 8, pp. 1685-1690, December, 2015.
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Udovenko, A.A., Davidovich, R.L. & Logvinova, V.B. Crystal structures of heptafluoridotantalates(V) with mono- and diprotonated cation of 4-amino-1,2,4-triazolium. J Struct Chem 56, 1623–1628 (2015). https://doi.org/10.1134/S0022476615080260
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DOI: https://doi.org/10.1134/S0022476615080260