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题名: Heat capacity and thermodynamical properties of the crystal of [RE2(Glu)(2)(H2O)(8)](ClO4)(4)center dot H2O (RE = Nd, Eu, Dy)
作者: Wu XinMin1;  Li Wei1;  Tan ZhiCheng2;  Qu SongSheng3
关键词: complex of rare earth ;  [RE2(Glu)(2)(H2O)(8)](ClO4)(4)center dot H2O (RE= Nd, Eu, Dy ;  low-temperature heat capacity ;  standard enthalpy of formation ;  Glu = glutamic acid)
刊名: SCIENCE IN CHINA SERIES B-CHEMISTRY
发表日期: 2009-07-01
DOI: 10.1007/s11426-009-0065-4
卷: 52, 期:7, 页:862-867
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: Thermodynamical data of rare earth complexes with amino acid are important for engineering chemistry and fundamental chemistry. However, they have rarely been reported. In this work, a series of crystalline complexes of rare earth perchlorate coordinated with glutamic acid have been synthesized in water medium, and their thermodynamical data, including the heat capacity in low temperature range and the standard enthalpy of formation, were determined. These complexes were identified to be [RE2(Glu)(2)(H2O)(8)](ClO4)(4)center dot H2O (RE = Nd, Eu, Dy) by using thermogravimetric analysis (TG), differential thermal analysis (DTA), and chemical and elementary analyses. Their purity has been determined. No melting points were observed for all the three complexes. The heat capacity of the complexes was measured by an adiabatic calorimeter from 79 to 370 K. Abnormal heat capacity values were detected for two of the complexes and the decomposition range of one complex was found. The temperature, enthalpy change and entropy change of the decomposition processes of the three complexes were calculated. The polynomial equations of heat capacity in the experimental temperature range have been obtained by least squares fitting. The standard enthalpy of formation was determined by an isoperibol reaction calorimeter at 298.15 K.
关键词[WOS]: RARE-EARTH ;  AMINO-ACIDS ;  THERMOCHEMISTRY
语种: 英语
WOS记录号: WOS:000267396300002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141557
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.Beijing Inst Petrochem Technol, Dept Chem Engn, Beijing 102617, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
3.Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China

Recommended Citation:
Wu XinMin,Li Wei,Tan ZhiCheng,et al. Heat capacity and thermodynamical properties of the crystal of [RE2(Glu)(2)(H2O)(8)](ClO4)(4)center dot H2O (RE = Nd, Eu, Dy)[J]. SCIENCE IN CHINA SERIES B-CHEMISTRY,2009,52(7):862-867.
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