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Thermodynamics of the bis-(η6-m-xylene)molybdenum fulleride [(η6-(m-xylene))2Mo]•+[C60]•−

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Abstract

In this study, the temperature dependence of heat capacity C p° = f(T) of crystalline bis-(η6-m-xylene)molybdenum fulleride between T = (8 and 320) K was measured by precision adiabatic vacuum calorimetry. Also the temperature dependence of EPR signal parameters of bis-(η6-m-xylene)molybdenum fulleride in the range from 120 to 300 K was investigated by electron paramagnetic resonance. In the interval 175–220 K the reversible endothermic transformation was detected and its thermodynamic characteristics were estimated. This transformation was caused by the dissociation of the (C60 −)2 dimer in the [(η6-(m-xylene))2Mo]•+[C60]•− fulleride during heating. Based on the experimental data, the standard (p° = 0.1 MPa) thermodynamic functions, namely, the heat capacity, enthalpy, entropy, and Gibbs function were calculated for dimeric fulleride in the interval from T → 0 to 175 K as well as for monomeric [(η6-(m-xylene))2Mo]•+[C60]•− complex between 220 and 320 K. The standard thermodynamic properties of tested fulleride and previously studied C60 fullerite and neutral dimer (C60)2 were compared.

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Acknowledgements

This study was performed with the financial support of the Russian Foundation of Basic Research (Projects No. 08-03-00214a, 09–03–97034-p-povol-a, 09-03-97045-p-povol-a, and 10-03-00968a), and the Ministry of Science and Education (Contract No P-337).

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Authors and Affiliations

  1. Chemistry Institute, Nizhny Novgorod State University, Gagarin Pr. 23/5, 603950, Nizhny, Novgorod, Russian Federation

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

  2. Razuvaev Institute of Organometallic Chemistry of Russian Academy of Sciences, Tropinin Str. 49, 603950, Nizhny, Novgorod, Russian Federation

    G. V. Markin, S. Yu. Ketkov, V. A. Kuropatov, V. K. Cherkasov, G. A. Abakumov & G. A. Domrachev

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  1. A. V. Markin
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  2. V. A. Ruchenin
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  3. N. N. Smirnova
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  4. G. V. Markin
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  6. V. A. Kuropatov
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  8. G. A. Abakumov
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  9. G. A. Domrachev
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Correspondence to A. V. Markin.

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Markin, A.V., Ruchenin, V.A., Smirnova, N.N. et al. Thermodynamics of the bis-(η6-m-xylene)molybdenum fulleride [(η6-(m-xylene))2Mo]•+[C60]•− . J Therm Anal Calorim 105, 635–643 (2011). https://doi.org/10.1007/s10973-010-1195-9

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