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题名: Low-temperature heat capacities and thermochemistry on the complex of erbium perchlorate with L-alpha-glycine [Er-2(L-Gly)(2)(H2O)(12)](ClO4)(6) center dot 4H(2)O(s)
作者: Di, You-Ying1;  Tan, Zhi-Cheng2
关键词: complex of erbium perchlorate with L-alpha-glycine ;  adiabatic calorimetry ;  low-temperature heat capacity ;  isoperibol solution-reaction calorimetry ;  Standard molar enthalpy of formation
刊名: ACTA CHIMICA SLOVENICA
发表日期: 2007
卷: 54, 期:4, 页:761-768
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: A coordination compound of erbium perchlorate with L-alpha-glycine, [Er-2(L-Gly)(2)(H2O)(12)](ClO4)(6) center dot 4H(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 over the temperature range from 78 to 372 K. An obvious endothermic peak in the heat capacity curve was observed over the temperature region of 275-296 K, which was ascribed to a solid-to-solid phase transition according to the results of TG/DTG analysis. 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, T-trs = ( 283.315 +/- 0.061) K, ( 11.026 +/- 0.059) kJ mol(-1) and ( 38.918 +/- 0.206) J K-1 mol(-1). Two polynomial equations of heat capacities as a function of the temperature in the regions of 78-275 K and 296-372 K were fitted by the least square method, respectively. 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)o= -( 7794.40 +/- 1.01) kJ mol(-1), by an isoperibol solution-reaction calorimeter.
关键词[WOS]: CALORIMETER
语种: 英语
WOS记录号: WOS:000252091300014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140719
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,Tan, Zhi-Cheng. Low-temperature heat capacities and thermochemistry on the complex of erbium perchlorate with L-alpha-glycine [Er-2(L-Gly)(2)(H2O)(12)](ClO4)(6) center dot 4H(2)O(s)[J]. ACTA CHIMICA SLOVENICA,2007,54(4):761-768.
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