Low-Temperature Heat Capacity and Thermodynamic Functions of Tetrameric Cobalt(II) Acetylacetonate

Abstract

Low-temperature heat capacity of tetrameric cobalt(II) acetylacetonate (tetrakis[bis(2,4-pentanedionato)cobalt(II)], [Co(C 5 H 7 O 2 ) 2 ] 4 ) was measured by an adiabatic method in a temperature range from 13.49 to 310.31 K. No phase transition-associated anomalies in the functional behavior of the heat capacity were detected in the entire tested temperature range. The obtained data were used to calculate the Debye characteristic temperature and integral thermodynamic functions (entropy, enthalpy, and reduced Gibbs energy) in a temperature range of 0 to 310 K. The absolute entropy values were used to calculate the formation entropy of [Co(C 5 H 7 O 2 ) 2 ] 4 at T = 298.15 K. A correlation was found between the unit cell volume, normalized to the number of molecules in this cell, and the heat capacity at T = 298.15 K.

Lanthanide-Aromatic Iminodiacetate Frameworks with Helical Tubes: Structure, Properties, and Low-Temperature Heat Capacity

“…From heat capacity, researchers can derive thermodynamic functions of materials, such as entropy, enthalpy, and Gibbs free energy, and further investigate and understand lattice vibrations, metals, superconductivity, electronic and nuclear magnetism, dilute magnetic systems, and structural transitions. 54 − 58 …”

“…As a useful tool of thermodynamic methods, heat capacity measurement has been utilized to investigate thermal properties of materials at low temperature. From heat capacity, researchers can derive thermodynamic functions of materials, such as entropy, enthalpy, and Gibbs free energy, and further investigate and understand lattice vibrations, metals, superconductivity, electronic and nuclear magnetism, dilute magnetic systems, and structural transitions. − …”

Heat Capacity and Thermodynamic Functions of Crystalline β-Cytidine from 0 to 300 K

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“…Temperatures of the calorimetric ampoule were measured with a capsule-type platinum resistance thermometer ( R 100 / R 0 = 1.3925) calibrated above 13 K on the ITS-90 scale. The standard uncertainty for the temperature was u ( T ) = 0.01 K. Previously, the heat capacity of a standard sample of benzoic acid (NIST SRM 39j) was measured in the range of 13.83 to 302.07 K to verify the accuracy of the calorimeter. It is shown that the relative deviations of the measured heat capacity of benzoic acid from the reference , were less than 0.9% at T /K ≤ 20 and less than 0.23% at T /K > 20.…”

The low temperature heat capacity of Li2Mo0.05W0.95O4

“…A vacuum adiabatic calorimeter assembled at the NIIC SB RAS [14] was used to measure the heat capacity. The obtained data reliability is confirmed by heat capacity measurements of a standard substance (benzoic acid), characterizing the uncertainty of setup calibration.…”