Calorimetric and structural studies of organic compound of tris(pentafluorophenyl)-4-pyridylethylgermane
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In the present research, the temperature dependence of heat capacity of tris(pentafluorophenyl)-4-pyridylethylgermane (C6F5)3Ge–CH2–CH2–C5H4N was studied by precise adiabatic vacuum calorimetry and differential scanning calorimetry over the temperature range from 6 to 450 K. The temperature and enthalpy of fusion of tris(pentafluorophenyl)-4-pyridylethylgermane and the total mole fraction of impurities have been determined. The thermal stability of the sample was investigated by thermogravimetric analysis. The experimental data were used to calculate the standard thermodynamic functions: heat capacity, enthalpy, entropy, and the Gibbs energy over the range from T → 0 to 420 K for crystalline and liquid states. For the compound under study, the standard entropy of formation in the crystalline state was calculated at T = 298.15 K. In addition, the structure of the investigated compound was established, and corresponding structural parameters were determined.
KeywordsTris(pentafluorophenyl)-4-pyridylethylgermane Adiabatic vacuum calorimetry DSC Thermogravimetric analysis Heat capacity Thermodynamic functions
This work was performed with the financial support of the Ministry of Education and Science of the Russian Federation (Contracts Nos. 4.6138.2017/6.7 and 4.5706.2017/8.9) and the Russian State Assignment (Theme No. 44.2, Reg. No. AAAA-A16-116122110053-1). The elemental analysis was conducted based on equipment of the Common Use Center « New Materials and Resource-saving Technologies» of the Research Institute for Chemistry of National Research Lobachevsky State University of Nizhny Novgorod.
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