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题名: Standard enthalpy of formation and heat capacities of 3,5-di-tert-butylsalicylic acid
作者: Yu, HG;  Tan, ZC;  Liu, Y;  Lan, XZ;  Xu, F;  Huang, XM;  Sun, LX
关键词: 3,5-di-tert-butylsalicylic acid ;  standard enthalpy of formation ;  heat capacity ;  enthalpy of fusion ;  enthalpy of evaporation
刊名: THERMOCHIMICA ACTA
发表日期: 2003-09-04
DOI: 10.1016/S0040-6031(03)00084-4
卷: 404, 期:1-2, 页:89-95
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: The constant volume energy of combustion of crystalline 3,5-di-tert-butylsalicylic acid (t-BSA) in oxygen at 298.15 K was determined using combustion calorimeter to be -8292.57 +/- 2.51 kJ mol(-1). The standard molar enthalpies of combustion and formation of 3,5-di-tert-butylsalicylic acid were derived, at T = 298.15 K, Delta(c)H(m)(Theta) = -8302.48 +/- 2.51 kJ mol(-1) and Delta(f)H(m)(Theta) = -744.30 +/- 3.21 kJ mol(-1), respectively. The heat capacities of the compound were measured with an adiabatic calorimeter over the temperature range from 79 to 351 K. No indication of any phase transition or thermal anomaly was observed in this temperature range. The fusion and evaporation behavior of the compound were examined by thermogravimetry (TG). differential thermal analysis (DTA) and differential scanning calorimetry (DSC). The molar enthalpy and entropy of fusion. Delta(fus)H(m)(Theta) and Delta(fus)S(m)(Theta), at T = 437.5 K, were determined to be 22.92 +/- 0.55 kJ mol(-1) and 139.4 +/- 3.3 J mol(-1) K-1, respectively: and the molar enthalpy and entropy of evaporation, Delta(vap)H(m)(Theta) and Delta(vap)S(m)(Theta), at T = 477.5 K, were obtained as 83.88 +/- 2.1 kJ mol(-1) and 341.7 +/- 8.4 J mol(-1) K-1, respectively. (C) 2003 Elsevier Science B.V. All rights reserved.
关键词[WOS]: THERMOCHEMICAL PROPERTIES ;  SMALL SAMPLES ;  COMBUSTION ;  CALORIMETER
语种: 英语
WOS记录号: WOS:000185448300011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138213
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Wuhan Univ, Dept Chem, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China

Recommended Citation:
Yu, HG,Tan, ZC,Liu, Y,et al. Standard enthalpy of formation and heat capacities of 3,5-di-tert-butylsalicylic acid[J]. THERMOCHIMICA ACTA,2003,404(1-2):89-95.
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