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Simulating the synthesis and thermodynamic characteristics of the desolvation of lanthanide borohydride tris-Tetrahydrofuranates

  • Chemical Thermodynamics and Thermochemistry
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Abstract

Lanthanide borohydride tris-tetrahydrofuranates (Ln(BH4) · 3THF, where THF is tetrahydrofuran and Ln is La, Nd, Sm, Gd, Er, Yb, and Lu) is synthesized via the exchange reaction of lanthanide(III) chloride and sodium borohydride in THF. It is found that synthesis proceeds according to a stepwise mechanism and the product of the reaction (lanthanide borohydride) initiates the process. The two-step character of the desolvation of Ln(BH4)3 · 3THF under steady-state conditions in the temperature range of 300 to 400 K is determined through X-ray phase and chemical analyses, tensiometry, and gas volumetry. It is established that one mole and then two moles of THF are removed from the initial sample at the first and second steps, respectively. Equations for barograms are obtained and the thermodynamic characteristics of desolvation of Ln(BH4)3 · 3THF under study are calculated. Gibbs energy values of the stages of process are determined semi-empirically. The law of its change for the entire series of Ln(BH4)3 · 3THF is determined with the emergence of the tetrad effect.

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Authors and Affiliations

  1. Sino Tajik State Medical University, Dushanbe, 734003, Tajikistan

    B. A. Gafurov

  2. Agency of Nuclear and Radiation Safety, Academy of Sciences of the Republic of Tajikistan, Dushanbe, 734025, Tajikistan

    I. U. Mirsaidov & D. Kh. Nasrulloeva

  3. Osimi Tajik Technical University, Dushanbe, 734042, Tajikistan

    A. Badalov

Authors
  1. B. A. Gafurov
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  2. I. U. Mirsaidov
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  3. D. Kh. Nasrulloeva
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  4. A. Badalov
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Correspondence to B. A. Gafurov.

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Original Russian Text © B.A. Gafurov, I.U. Mirsaidov, D.Kh. Nasrulloeva, A. Badalov, 2013, published in Zhurnal Fizicheskoi Khimii, 2013, Vol. 87, No. 10, pp. 1630–1635.

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Gafurov, B.A., Mirsaidov, I.U., Nasrulloeva, D.K. et al. Simulating the synthesis and thermodynamic characteristics of the desolvation of lanthanide borohydride tris-Tetrahydrofuranates. Russ. J. Phys. Chem. 87, 1601–1606 (2013). https://doi.org/10.1134/S0036024413100075

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  • DOI: https://doi.org/10.1134/S0036024413100075

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