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Low-Temperature Behavior of the Heat Capacity and Photoluminescence of the Binuclear Pivalate Complex [Eu2(Bаth)2(Piv)6]

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Abstract

The low-temperature behavior of the heat capacity and photoluminescence of the earlier structurally characterized binuclear pivalate complex [Eu2(Bath)2(Piv)6] (monoclinic crystal system, I2/a) (I), where Bath = 4,7-diphenyl-1,10-phenanthroline, Piv = \({{{\text{(C}}{{{\text{H}}}_{{\text{3}}}}{\text{)}}}_{{\text{3}}}}{\text{CCO}}_{2}^{ - }\), is studied. The temperature dependence of the heat capacity in a temperature range of 5.96–302.88 K is measured by adiabatic calorimetry, and the thermodynamic functions \(C_{p}^{^\circ }\)(T), S°(T), Ф°(Т), and Н°(Т) – Н°(0) are calculated. The absence of low-temperature phase transitions in complex I is shown. In a temperature range of 98–295 K, complex I demonstrates a high temperature stability of the integral photoluminescence intensity of the 5D0–7Fj (j = 0–6) transitions of the Eu3+ ion.

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ACKNOWLEDGMENTS

This work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the State Assignment of the Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences. This research was performed using the equipment of the JRC PMR IGIC RAS.

Funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation as a part of the state assignment of the Kurnakov Institute of General and Inorganic Chemistry Russian Academy of Sciences.

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Authors and Affiliations

  1. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russia

    I. G. Fomina, A. V. Tyurin & I. L. Eremenko

  2. Skobeltsyn Institute of Nuclear Physics, M.V. Lomonosov Moscow State University, Moscow, Russia

    Yu. S. Zavorotnyi

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  1. I. G. Fomina
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  2. A. V. Tyurin
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  3. Yu. S. Zavorotnyi
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  4. I. L. Eremenko
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Correspondence to I. G. Fomina.

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Translated by E. Yablonskaya

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Fomina, I.G., Tyurin, A.V., Zavorotnyi, Y.S. et al. Low-Temperature Behavior of the Heat Capacity and Photoluminescence of the Binuclear Pivalate Complex [Eu2(Bаth)2(Piv)6]. Russ J Coord Chem 49, 822–829 (2023). https://doi.org/10.1134/S107032842360105X

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