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题名: Low-temperature heat capacities of [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
关键词: [Er-2(Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O ;  adiabatic calorimetry ;  low-temperature heat capacity ;  phase transition
刊名: THERMOCHIMICA ACTA
发表日期: 2007-10-25
DOI: 10.1016/j.tca.2007.05.002
卷: 463, 期:1-2, 页:10-12
收录类别: ISTP ;  SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: A coordination compound of erbium perchlorate With L-alpha-glutamic acid, [Er-2(L-Glu)2(H2O)(6)](ClO4)(4).6H(2)O(S), was synthesized. By chemical analysis, elemental analysis, FTIR, TG/DTG and comparison with relevant literature, 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 from 78 to 318 K. An endothermic peak in the heat-capacity curve was observed over the temperature region of 290-316 K, which was ascribed to a solid-to-solid phase transition. The temperature T 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 U mol(-1) and 33.9 +/- 0.2 J K-1 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. (C) 2007 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000250353500004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140511
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, Shandong, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Di, You-Ying,Zhang, Jian,Tan, Zhi-Cheng. Low-temperature heat capacities of [Er-2(L-Glu)(2)(H2O)(6)](ClO4)(4)center dot 6H(2)O(S)[J]. THERMOCHIMICA ACTA,2007,463(1-2):10-12.
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