Low temperature heat capacity of the coordination compound
| Autor: | Yu. A. Kovalevskaya, I. E. Paukov, L. G. Lavrenova, V G Bessergenev |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
chemistry.chemical_classification
Nickel(II) nitrate Chemistry Stereochemistry Enthalpy Analytical chemistry chemistry.chemical_element Atmospheric temperature range Condensed Matter Physics Heat capacity Gibbs free energy Coordination complex symbols.namesake Nickel chemistry.chemical_compound symbols Physical and Theoretical Chemistry Adiabatic process |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 75:331-336 |
| ISSN: | 1388-6150 |
| DOI: | 10.1023/b:jtan.0000017353.24441.25 |
| Popis: | Low-temperature heat capacity of the coordination compound of nickel(II) nitrate with 4-amine-1,2,4-triazole was measured in the temperature range from 11 to 317 K using a computerized vacuum adiabatic calorimeter. The thermodynamic functions have been derived from the smoothed experimental data over the whole temperature interval covered and at standard conditions. At 298.15 K, the heat capacity is 574.7±1.2 J K-1 mol-1, the entropy is 599.2±1.2 J K-1 mol-1, the enthalpy is 91070±200 J mol-1, and the reduced Gibbs energy is 293.7±1.2 J K-1 mol-1. The results on Cp(T) were compared with those for Cu(NH2trz)3(NO3)2·0.5H2O. It was revealed that the slope of the curve dCp/dT (T) changes essentially for both compounds at 110-120 K. It implies that additional degrees of freedom appear in the heat capacity at these temperatures. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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