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题名: Synthesis, characterization and thermochemistry of anhydrous potassium nicotinate
作者: Kong Yu-Xia2;  Li Yue-Bao2;  Yang Wei-Wei2;  Di You-Ying2;  Shi Quan1;  Tan Zhi-Cheng1
关键词: anhydrous potassium nicotinate ;  adiabatic calorimetry ;  low-temperature heat capacity ;  isoperibol solution-reaction calorimetry ;  standard molar enthalpy of formation
刊名: ACTA CHIMICA SINICA
发表日期: 2008-03-28
卷: 66, 期:6, 页:609-616
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Nicotinic acid and anhydrous potassium acetate were chosen as the reactants, and a novel compound-anhydrous potassium nicotinate was synthesized by the method of room temperature solid phase synthesis. FTIR and X-ray powder diffraction techniques were applied to characterize its structure. Low-temperature heat capacities of the K(C(6)H(4)NO(2))(S) were measured with a small sample precision automated adiabatic calorimeter over the temperature range from 77 to 400 K. A polynomial equation of the heat capacities as a function of the temperature was fitted by the least square method. Based on the fitted polynomial, the smoothed heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated and tabulated at the interval of 5 K. A reasonable thermochemical cycle was designed, and the standard molar enthalpies of dissolution for the reactants and products of the solid phase reaction in the selected solvent were measured by an isoperibol solution-reaction calorimeter, respectively. In addition, the enthalpy change of the solid phase reaction was calculated to be Delta(r)H(m)(circle minus)= (25.87 +/- 0.47) kJ.mol(-1) from the data of the above standard molar enthalpies of dissolution. Finally, the standard molar enthalpy of formation of anhydrous potassium nicotinate K(C(6)H(4)NO(2))(S) was determinedtobe Delta(f)H(m)(circle minus)[K(C(6)H(4)NO(2)),s] = -(560.57 +/- 1.09) kJ.mol(-1) in accordance with Hess law.
关键词[WOS]: STANDARD MOLAR ENTHALPY
语种: 英语
WOS记录号: WOS:000255103800004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140803
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, Thermochem Lab, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Peoples R China

Recommended Citation:
Kong Yu-Xia,Li Yue-Bao,Yang Wei-Wei,et al. Synthesis, characterization and thermochemistry of anhydrous potassium nicotinate[J]. ACTA CHIMICA SINICA,2008,66(6):609-616.
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