Low-temperature heat capacity and thermodynamic properties of crystalline carboxin (C12H13NO2S) |
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Authors: | Mei-Han Wang Xiao-Hong Sun Li-Guo Kong Tao Zhang |
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Affiliation: | a Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhoushan Road, Dalian 116023, China b College of Chemical Engineering, Northwest University, Xi’an 710069, China |
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Abstract: | Carboxin was synthesized and its heat capacities were measured with an automated adiabatic calorimeter over the temperature range from 79 to 380 K. The melting point, molar enthalpy (ΔfusHm) and entropy (ΔfusSm) of fusion of this compound were determined to be 365.29±0.06 K, 28.193±0.09 kJ mol−1 and 77.180±0.02 J mol−1 K−1, respectively. The purity of the compound was determined to be 99.55 mol% by using the fractional melting technique. The thermodynamic functions relative to the reference temperature (298.15 K) were calculated based on the heat capacity measurements in the temperature range between 80 and 360 K. The thermal stability of the compound was further investigated by differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. The DSC curve indicates that the sample starts to decompose at ca. 290 °C with the peak temperature at 292.7 °C. The TG-DTG results demonstrate the maximum mass loss rate occurs at 293 °C corresponding to the maximum decomposition rate. |
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Keywords: | Carboxin Heat capacity Thermodynamic functions Adiabatic calorimetry TG DSC |
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