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Features of the ion mobility and phase transitions in hexafluoro complex compounds of tantalum(V), niobium(V), and titanium(IV) with the tetramethylammonium cation

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Abstract

19F, 1H NMR and DSC methods are used to study the ion mobility and phase transitions in hexafluoro complex compounds of tantalum(V), niobium(V), and titanium(IV) with the tetramethylammonium cation. A transformation of the NMR spectra observed in a temperature range 77(130)-450 K is found to be associated with a change in the type of ion motions in the anion and cation sublattices of the studied compounds. In a temperature range 170-450 K the main types of ion motions are isotropic reorientations of TaF6, NbF6, TiF6 octahedra and tetramethylammonium ions. Two endothermic effects with the maxima at 232.5 K and 256.5 K for [N(CH3)4]TaF6 and 235 K and 250 K for [N(CH3)4]NbF6, which are observed in the DSC curve in the range 170-400 K correspond to phase transitions that have almost no effect on the NMR spectral parameters the a temperature range 230-260 K. For the [N(CH3)4]2TiF6 compound, an endothermic effect at 422 K is observed, corresponding to the phase transition from the rhombohedral to the cubic modification.

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Authors and Affiliations

  1. Institute of Chemistry, Far East Branch, Russian Academy of Sciences, Vladivostok, Russia

    V. Ya. Kavun, A. B. Slobodyuk, N. A. Didenko & R. L. Davidovich

Authors
  1. V. Ya. Kavun
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  2. A. B. Slobodyuk
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  3. N. A. Didenko
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  4. R. L. Davidovich
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Correspondence to V. Ya. Kavun.

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Devoted to the 80th anniversary of Professor S. P. Gabuda

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Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 5, pp. 966-974, June-July, 2016.

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Kavun, V.Y., Slobodyuk, A.B., Didenko, N.A. et al. Features of the ion mobility and phase transitions in hexafluoro complex compounds of tantalum(V), niobium(V), and titanium(IV) with the tetramethylammonium cation. J Struct Chem 57, 917–925 (2016). https://doi.org/10.1134/S0022476616050103

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  • DOI: https://doi.org/10.1134/S0022476616050103

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