Heat capacities and standard molar enthalpy of formation of pyrimethanil maleic salt and pyrimethanil fumaric salt

IMR OpenIR

	Heat capacities and standard molar enthalpy of formation of pyrimethanil maleic salt and pyrimethanil fumaric salt
	M. H. Wang; H. Lei; Z. X. Hou; S. H. Wang
	2013
发表期刊	Journal of Thermal Analysis and Calorimetry
ISSN	1388-6150
卷号	114 期号:1 页码:313-319
摘要	Novel anilino-pyrimidine fungicides, pyrimethanil maleic salt, and pyrimethanil fumaric salt (C28H30N6O4) were synthesized by a chemical reaction of pyrimethanil with maleic acid/fumaric acid. The low-temperature heat capacities of the two compounds were measured with an adiabatic calorimeter from 80 to 350 K. The heat capacities of pyrimethanil fumaric salt are bigger than that of pyrimethanil maleic salt in the measurement temperature range. The thermodynamic function data relative to 298.15 K were calculated based on the heat capacity-fitted curves. The melting points, the molar enthalpies (Delta(fus) H (m)), and entropies (Delta(fus) S (m)) of fusion of pyrimethanil maleic salt and pyrimethanil fumaric salt were determined from their DSC curves. The values indicate that pyrimethanil fumaric salt was more thermostable than pyrimethanil maleic salt. The constant-volume energies of combustion (Delta(c) U (m) (o) ) of pyrimethanil maleic salt and pyrimethanil fumaric salt were measured using an isoperibol oxygen bomb combustion calorimeter at T = (298.15 +/- A 0.001) K. From the Hess thermochemical cycle, the standard molar enthalpies of formation of the two compounds were derived and determined to be Delta(f) H (m) (o) (pyrimethanil maleic salt) = -459.3 +/- A 4.9 kJ mol(-1) and Delta(f) H (m) (o) (pyrimethanil fumaric salt) = -557.2 +/- A 4.8 kJ mol(-1), respectively. The results suggest that pyrimethanil fumaric salt is more chemically stable than pyrimethanil maleic salt.
部门归属	[wang, meihan ; hou, zhaoxia ; wang, shaohong] shenyang univ, ctr sci res, shenyang 110044, peoples r china. [lei, hao] chinese acad sci, inst met res, state key lab corros & protect, surface engn mat div, shenyang 110016, peoples r china. ; wang, mh (reprint author), shenyang univ, ctr sci res, shenyang 110044, peoples r china. ; wangmhdicp@yahoo.com.cn
关键词	Pyrimethanil Maleic Salt Pyrimethanil Fumaric Salt Heat Capacity Thermodynamic Functions Standard Molar Enthalpy Of Formation Thermodynamic Properties Adiabatic Calorimeter Crystalline
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/71544
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	M. H. Wang,H. Lei,Z. X. Hou,et al. Heat capacities and standard molar enthalpy of formation of pyrimethanil maleic salt and pyrimethanil fumaric salt[J]. Journal of Thermal Analysis and Calorimetry,2013,114(1):313-319.
APA	M. H. Wang,H. Lei,Z. X. Hou,&S. H. Wang.(2013).Heat capacities and standard molar enthalpy of formation of pyrimethanil maleic salt and pyrimethanil fumaric salt.Journal of Thermal Analysis and Calorimetry,114(1),313-319.
MLA	M. H. Wang,et al."Heat capacities and standard molar enthalpy of formation of pyrimethanil maleic salt and pyrimethanil fumaric salt".Journal of Thermal Analysis and Calorimetry 114.1(2013):313-319.