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题名: Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)
作者: Di You-Ying;  Zhang Jian;  Tan Zhi-Cheng
通讯作者: 邸友莹
关键词: [Er-2(Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(s) ;  adiabatic calorimetry ;  heat capacity ;  isoperibol solution-reaction calorimetry ;  standard molar enthalpy of formation
刊名: CHINESE JOURNAL OF CHEMISTRY
发表日期: 2007-10-01
卷: 25, 期:10, 页:1423-1429
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 coordination compound of erbium perchlorate with L-alpha-glutamic acid, [Er-2(GIU)(2)((HO)-O-2)(6)](C1O(4))(4)center dot 6H(2)O(s), was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTQ and comparison with relevant literatures, its chemical composition and structure were established. The mechanism of thermal decomposition of the complex was deduced on the basis of the TG/DTG analysis. Low-temperature heat capacities were measured by a precision automated adiabatic calorimeter from 78 to 318 K. An endothermic peak in the heat capacity curve was observed over the temperature region of 290-318 K, which was ascribed to a solid-to-solid phase transition. The temperature T-trans, the enthalpy Delta H-trans(m) and the entropy Delta S-trans(m) of the phase transition for the compound were determined to be: (308.73 +/- 0.45) K, (10.49 +/- 0.05) kJ center dot mol(-1) and (33.9 +/- 0.2) J center dot K-1 center dot mol(-1). Polynomial equation of heat capacities as a function of the temperature in the region of 78-290 K was fitted by the least square method. Standard molar enthalpies of dissolution of the mixture [2ErCl(3)center dot 6H(2)O(s)+2L-Glu(s)+6NaC1O(4)center dot H2O(s)] and the mixture { [Er-2(Glu)(2)(H2O)(6)](C1O(4))(4 center dot)6H(2)O(s) + 6NaC1(s)} in 100 mL of 2 mol center dot dm(-3) HC1O(4) as calorimetric solvent, and 12HC104(l)) in the solution A at T=298.15 K were measured to be, Delta H-d(m,1)=(31.552 +/- 0.026) kJ center dot mol(-1), Delta H-d(m,2)=(41.302 +/- 0.034) kJ center dot mol(-1), and Delta dH(m,3) = (14.986 +/- 0.064) kJ center dot mol(-1), respectively. In accordance with Hess law, the standard molar enthalpy of formation of the complex was determined as Delta H-f Theta(m)=-(7551.0 +/- 2.4)kJ center dot mol by using an isoperibol solution-reaction calorimeter and designing a thermochemical cycle.
关键词[WOS]: CALORIMETER
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000250356900005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/99677
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 252029, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning, Peoples R China

Recommended Citation:
Di You-Ying,Zhang Jian,Tan Zhi-Cheng. Thermochemistry on the complex of erbium perchlorate with L-alpha-glutamic acid [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)[J]. CHINESE JOURNAL OF CHEMISTRY,2007,25(10):1423-1429.
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