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题名: Thermochemistry of Alkyl Pyridinium Bromide Ionic Liquids: Calorimetric Measurements and Calculations
作者: Tong, Bo3;  Liu, Qing-Shan1;  Tan, Zhi-Cheng1, 2;  Welz-Biermann, Urs1
刊名: JOURNAL OF PHYSICAL CHEMISTRY A
发表日期: 2010-03-25
DOI: 10.1021/jp9047538
卷: 114, 期:11, 页:3782-3787
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Two ionic liquids, 1-ethylpyridinium bromide (EPBr) and 1-propylpyridinium bromide (PPBr), were prepared and the structures were characterized by (1)H NMR. The thermodynamic properties of EPBr and PPBr were studied with adiabatic calorimetry (AC) and thermogravimatric analysis (TG-DTG). The beat capacity was precisely Measured ill the temperature range from 78 to 410 K by Means of a fully automated adiabatic calorimeter. For EPBr, the melting temperature, enthalpy, and entropy of solid-liquid phase transition were determined to be 391.31 +/- 0.28 K, 12.77 +/- 0.09 kJ.mol(-1), and 32.63 +/- 0.22 J.K(-1).mol(-1), respectively, and for PPBr they were 342.83 +/- 0.69 K, 10.97 +/- 0.05 kJ.mol(-1), and 32.00 +/- 0.10 J.K(-1).mol(-1), respectively. The thermodynamic functions (H(T)(0)-H(298.15)(0)) and (S(T)(0)-S(298.15)(0)) were derived from the heat capacity data in the experimental temperature range with an interval of 5 K. The thermostablility of the compounds Was further studied by TGA measurements. The phase change behavior and thermodynamic properties were compared and estimated in it series of alkyl pyridinium bromide ionic liquids. Results indicate that EPBr has higher melting and decomposition temperature. as well as phase transition enthalpy and entropy but lower heat capacity than PPBr due to their different molecular structures.
关键词[WOS]: PHYSICOCHEMICAL PROPERTIES ;  THERMODYNAMIC PROPERTIES ;  DIRECT ELECTROCHEMISTRY ;  CARBON NANOTUBES ;  NATURAL POLYOLS ;  HEAT-CAPACITIES ;  SURFACE-TENSION ;  IDENTIFICATION ;  CATALYSIS ;  DENSITY
语种: 英语
WOS记录号: WOS:000275707800007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142098
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, China Ion Liquid Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
3.Dalian Univ Technol, Sch Chem Engn, Dept Chem, Dalian 116023, Peoples R China

Recommended Citation:
Tong, Bo,Liu, Qing-Shan,Tan, Zhi-Cheng,et al. Thermochemistry of Alkyl Pyridinium Bromide Ionic Liquids: Calorimetric Measurements and Calculations[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2010,114(11):3782-3787.
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