|Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt|
|M. H. Wang; H. Lei; J. Zhang; Z. X. Hou; Y. Seki; Y. Sawada; S. H. Wang
|Source Publication||Journal of Thermal Analysis and Calorimetry
|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 (Delta(fus) H (m)), and entropy (Delta(fus) S (m)) of fusion were determined from its DSC curves. The constant-volume energy of combustion (Delta(c) U (m)) of pyrimethanil butanedioic salt was measured by an isoperibol oxygen-bomb combustion calorimeter at T = (298.15 +/- A 0.001) K. From the Hess thermochemical cycle, the standard molar enthalpy of formation was derived and determined to be Delta(f) H (m) (o) (pyrimethanil butanedioic salt)=-285.4 +/- A 5.5 kJ mol(-1).|
; zhang, jun
; hou, zhaoxia
; wang, shaohong] shenyang univ, sch mech engn, shenyang 110044, peoples r china. [lei, hao] chinese acad sci, inst met res, surface engn mat div, state key lab corros & protect, shenyang 110016, peoples r china. [seki, yoshiyuki
; sawada, yutaka] tokyo polytech univ, ctr hyper media res, atsugi, kanagawa 2430297, japan.
; wang, mh (reprint author), shenyang univ, sch mech engn, shenyang 110044, peoples r china.
|Keyword||Pyrimethanil Butanedioic Salt
Standard Molar Enthalpy Of Formation
M. H. Wang,H. Lei,J. Zhang,et al. Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt[J]. Journal of Thermal Analysis and Calorimetry,2014,117(3):1335-1340.
M. H. Wang.,H. Lei.,J. Zhang.,Z. X. Hou.,Y. Seki.,...&S. H. Wang.(2014).Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt.Journal of Thermal Analysis and Calorimetry,117(3),1335-1340.
M. H. Wang,et al."Molar heat capacities and standard molar enthalpy of formation of pyrimethanil butanedioic salt".Journal of Thermal Analysis and Calorimetry 117.3(2014):1335-1340.
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