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The thermodynamic properties of the [(Me3Si)7C60]2 fullerene complex

  • Chemical Thermodynamics and Thermochemistry
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Abstract

The temperature dependence of the heat capacity C o p of the [(Me3Si)7C60]2 fullerene complex was measured for the first time using precision adiabatic vacuum calorimetry over the temperature range 6.7–340 K and high-accuracy differential scanning calorimetry at 320–635 K. For the most part, the error in the C o p values was about ±0.5%. An irreversible endothermic effect caused by the splitting of the dimeric bond between fullerene fragments and the thermal decomposition of the complex was observed at 448–570 K. The thermodynamic characteristics of this transformation were calculated and analyzed. Multifractal analysis of the low-temperature (T < 50 K) heat capacity was performed, and conclusions were drawn concerning the character of the heterodynamicity of the structure. The experimental data obtained were used to calculate the standard thermodynamic functions C o p (T), H o(T) − H o(0), S o(T) − S o(0), and G o(T) − H o(0) over the temperature range from T → 0 to 445 K and estimate the standard entropy of formation of the compound from simple substances at 298.15 K. The standard thermodynamic properties of [(Me3Si)7C60]2 are compared with those of the (C60)2 dimer, the [(η6-Ph2)2Cr]+[C60]•̄ fulleride, and the initial C60 fullerene.

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Authors and Affiliations

  1. Research Institute of Chemistry, Nizhni Novgorod State University, pr. Gagarina 23/5, Nizhni Novgorod, 603950, Russia

    N. N. Smirnova, A. V. Markin & V. A. Ruchenin

  2. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, ul. Tropinina 49, Nizhni Novgorod, 603950, Russia

    S. N. Titova, E. A. Gorina, L. V. Kalakutskaya, G. A. Domrachev, A. M. Ob”edkov & S. Yu. Ketkov

Authors
  1. N. N. Smirnova
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  2. A. V. Markin
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  3. V. A. Ruchenin
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  4. S. N. Titova
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  5. E. A. Gorina
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  6. L. V. Kalakutskaya
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  7. G. A. Domrachev
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  8. A. M. Ob”edkov
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  9. S. Yu. Ketkov
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Additional information

Original Russian Text © N.N. Smirnova, A.V. Markin, V.A. Ruchenin, S.N. Titova, E.A. Gorina, L.V. Kalakutskaya, G.A. Domrachev, A.M. Ob”edkov, S.Yu. Ketkov, 2007, published in Zhurnal Fizicheskoi Khimii, 2007, Vol. 81, No. 6, pp. 985–992.

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Smirnova, N.N., Markin, A.V., Ruchenin, V.A. et al. The thermodynamic properties of the [(Me3Si)7C60]2 fullerene complex. Russ. J. Phys. Chem. 81, 854–860 (2007). https://doi.org/10.1134/S0036024407060040

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  • DOI: https://doi.org/10.1134/S0036024407060040

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