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- Title
Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt.
- Authors
Wang, Meihan; Lei, Hao; Zhang, Jun; Hou, Zhaoxia; Seki, Yoshiyuki; Sawada, Yutaka; Wang, Shaohong
- Abstract
A noval anilino-pyrimidine fungicide, pyrimethanil butanedioic salt (CHNO), was synthesized by a chemical reaction of pyrimethanil and butanedioic acid. The low-temperature heat capacities of the compound were measured with an adiabatic calorimeter from 80 to 380 K. The thermodynamic function data relative to 298.15 K were calculated based on the heat capacity fitted curve. The thermal stability of the compound was investigated by TG and DSC. The TG curve shows that pyrimethanil butanedioic salt starts to sublimate at 455.1 K and totally changes into vapor when the temperature reaches 542.5 K with the maximal speed of weight loss at 536.8 K. The melting point, the molar enthalpy (Δ H), and entropy (Δ S) of fusion were determined from its DSC curves. The constant-volume energy of combustion (Δ U) of pyrimethanil butanedioic salt was measured by an isoperibol oxygen-bomb combustion calorimeter at T = (298.15 ± 0.001) K. From the Hess thermochemical cycle, the standard molar enthalpy of formation was derived and determined to be Δ H (pyrimethanil butanedioic salt)=−285.4 ± 5.5 kJ mol.
- Subjects
HEAT capacity; ENTHALPY; PYRIMETHANIL; SODIUM succinate; THERMODYNAMIC functions; DIFFERENTIAL scanning calorimetry; THERMAL stability
- Publication
Journal of Thermal Analysis & Calorimetry, 2014, Vol 117, Issue 3, p1335
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-014-3871-7