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题名: Low-temperature heat capacity and thermodynamic properties of crystalline [Re-2(Ala)(4)(H2O)(8)](ClO4)(6) (Re = Eu, Er; Ala = alanine)
作者: Liu, BP;  Tan, ZC;  Zhang, DS;  Nan, ZD;  Sun, LX;  Xu, F;  Lan, XZ;  Liang, P;  Yu, XM
关键词: alanine rare earth compounds ;  heat capacity ;  thermal decomposition ;  adiabatic calorimeter ;  TG analysis
刊名: THERMOCHIMICA ACTA
发表日期: 2002-07-15
卷: 390, 期:1-2, 页:31-37
收录类别: 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: [Re-2(Ala)(4)(H2O)(8)](CLO4)(6) (Re = Eu, Er; Ala = alanine) were synthesized, and the low-temperature heat capacities of the two complexes were measured with a high-precision adiabatic calorimeter over the temperature range from 80 to 370 K. For [Eu-2(Ala)(4)(H2O)(8)](ClO4)(6), two solid-solid phase transitions were found, one in the temperature range from 234.403 to 249.960 K, with peak temperature 243.050 K, the other in the range from 249.960 to 278.881 K, with peak temperature 270.155 K. For [Er-2(Ala)(4)(H2O)(8)](ClO4)(6), one solid-solid phase transition was observed in the range from 270.696 to 282.156 K, with peak temperature 278.970 K. The molar enthalpy increments, DeltaH(m), and entropy increments,AS,, of these phase transitions, were determined to be 455.6 J mol(-1), 1.87 J K-1 mol(-1) at 243.050 K; 2277 J mol-1, 8.43 J K-1 mol-1 at 270.155 K for [Eu-2(Ala)(4)(H2O)(8)](ClO4)(6); and 4442 J mol(-1), 15.92 J K-1 mol(-1) at 278.970 K for [Er-2(Ala)(4)(H2O)(8)](ClO4)(6). Thermal decompositions of the two complexes were investigated by use of the thermogravimetric (TG) analysis. A possible mechanism for the thermal decomposition is suggested. (C) 2002 Elsevier Science B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000176793300004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139230
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.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
2.Changde Normal Coll, Dept Chem, Changde 415000, Peoples R China
3.Dalian Univ Technol, State Key Lab Fine Chem, Dalian 116012, Peoples R China

Recommended Citation:
Liu, BP,Tan, ZC,Zhang, DS,et al. Low-temperature heat capacity and thermodynamic properties of crystalline [Re-2(Ala)(4)(H2O)(8)](ClO4)(6) (Re = Eu, Er; Ala = alanine)[J]. THERMOCHIMICA ACTA,2002,390(1-2):31-37.
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