Thermochemical study of two N-benzoyl-N′,N′-dialkylureas

被引：9
|
作者：
da Silva, MAVR
da Silva, MDMCR
Silva, LCM
Dietze, F
Hoyer, E
机构：
[1] Univ Porto, Fac Ciencias, Dept Quim, Ctr Invest Quim, P-4169007 Porto, Portugal
[2] Univ Leipzig, Fak Chem & Mineral, Inst Anorgan Chem, D-04103 Leipzig, Germany
来源：
JOURNAL OF CHEMICAL THERMODYNAMICS | 2000年 / 32卷 / 09期
关键词：
N-benzoyl-N; N; '-diethylurea; '-diisobutylurea; enthalpy of combustion; enthalpy of sublimation;
D O I：
10.1006/jcht.1000.0527
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The standard (p(o) = 0.1 MPa) molar enthalpies of combustion in oxygen of crystalline N-benzoyl-N',N'-diethylurea, PhCONHCON(Et)(2) (HBETU) and N-benzoyl-N',N'- diisobutylurea, PhCONHCON(iBu)(2) (HBIBU), were measured at T = 298.15 K by static bomb combustion calorimetry. The standard molar enthalpies of sublimation of both compounds were measured using microcalorimetry. These values were used to derive the standard molar enthalpies of formation of the compounds in their crystalline and gaseous phases, respectively. -Delta (c)u(o)(cr)/(J . g(-1)) Delta H-g(cr)m(o)(kJ . mol(-1)) N-benzoyl-N',N'-diethylurea 29756.9 +/- 9.6 132.2 +/- 1.4 N-benzoyl-N',N'-diisobutylurea 33047.0 +/- 9.3 137.5 +/- 2.9 (C) 2000 Academic Press.
引用
收藏
页码：1113 / 1119
页数：7
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