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题名: Low-temperature heat capacities and thermochemistry of the complex of praseodymium perchlorate with L-alpha-glutamic acid: [Pr-2(Glu)(2)(ClO4)(H2O)(7)](ClO4)(3)center dot 4H(2)O
作者: Di You-Yong;  Tan Zhi-Cheng;  Li Yan-Sheng
通讯作者: 谭志诚
关键词: rare earth perchlorate salt ;  L-alpha-glutamic acid ;  adiabatic calorimetry ;  low-temperature heat capacity ;  isoperibol solution-reaction calorimetry ;  standard molar enthalpy of formation
刊名: ACTA CHIMICA SINICA
发表日期: 2006-07-14
卷: 64, 期:13, 页:1393-1401
收录类别: SCI
文章类型: Article
部门归属: 15
项目归属: 1504
产权排名: 2;2
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: A complex of praseodymium perchlorate with L-alpha-glutamic acid, [Pr-2(Glu)(2)(ClO4)(4)(H2O)(7)](ClO4)(3)center dot 4H(2)O, was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTG, and comparison with relevant literatures, its chemical composition and structure were established. The purity was found to be >99.0%, without melting point. Low-temperature heat capacities were measured by a,precision automated adiabatic calorimeter over the temperature range from 78 to 370 K. An obvious endothermic peak in the heat capacity curve was observed over the temperature region of 285 similar to 306 K, which was ascribed to a solid-to-solid phase transition according to the results of TG/DTG analysis and melting point measurement. The temperature T-tr, the enthalpy Delta H-tr(m) and the entropy Delta S-tr(m) of the phase transition for the compound were determined to be: (297.158 +/- 0.280) K, (12.338 +/- 0.016) kJ.mol(-1) and (41.520 +/- 0.156) J.K-1.mol(-1), respectively through three repeated heat capacity measurements in the phase transition region with different amounts of the sample. Two polynomial equations of heat capacities as a function of the temperature in the regions of 78 similar to 285 K and 306 similar to 370 K were fitted by the least square method, respectively. Based on the two fitted polynomials, the smoothed heat capacities and thermodynamic functions of the complex relative to the standard reference temperature 273.15 K were calculated with the interval of 5 K. The mechanism about thermal decomposition of the complex was deduced on the basis of the TG/DTG analysis. In accordance with Hess law the standard molar enthalpy of formation for the complex was determined as Delta H-f(m)Theta = (-7223.1 +/- 2.4) kJ.mol(-1), by application of an isoperibol solution-reaction calorimeter and choice of 1 mol.L-1 HCl as calorimetric solvent.
关键词[WOS]: CALORIMETER
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000239181500018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/97883
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.Liaocheng Univ, Coll Chem & Chem Engn, Liaocheng 252059, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
3.Dalian Jiaotong Univ, Coll Environm Sci & Engn, Dalian 116028, Peoples R China

Recommended Citation:
Di You-Yong,Tan Zhi-Cheng,Li Yan-Sheng. Low-temperature heat capacities and thermochemistry of the complex of praseodymium perchlorate with L-alpha-glutamic acid: [Pr-2(Glu)(2)(ClO4)(H2O)(7)](ClO4)(3)center dot 4H(2)O[J]. ACTA CHIMICA SINICA,2006,64(13):1393-1401.
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