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Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt

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Abstract

A noval anilino-pyrimidine fungicide, pyrimethanil butanedioic salt (C28H32N6O4), 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 (Δfus H m), and entropy (Δfus S m) of fusion were determined from its DSC curves. The constant-volume energy of combustion (Δc U m) 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 Δf H om (pyrimethanil butanedioic salt)=−285.4 ± 5.5 kJ mol−1.

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Acknowledgements

The authors gratefully acknowledge the National Natural Science Foundation of China for financial support to this work under the NSFC Grant No. 51302175.

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Authors and Affiliations

  1. School of Mechanical Engineering, Shenyang University, Shenyang, 110044, China

    Meihan Wang, Jun Zhang, Zhaoxia Hou & Shaohong Wang

  2. State Key Laboratory for Corrosion and Protection, Surface Engineering of Materials Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Hao Lei

  3. Center for Hyper Media Research, Tokyo Polytechnic University, 1583 Iiyama, Atsugi, Kanagawa, 243-0297, Japan

    Yoshiyuki Seki & Yutaka Sawada

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  1. Meihan Wang
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  2. Hao Lei
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  3. Jun Zhang
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  7. Shaohong Wang
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Correspondence to Meihan Wang.

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Wang, M., Lei, H., Zhang, J. et al. Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt. J Therm Anal Calorim 117, 1335–1340 (2014). https://doi.org/10.1007/s10973-014-3871-7

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  • DOI: https://doi.org/10.1007/s10973-014-3871-7

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