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题名: Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6)
作者: Liu, BP;  Tan, ZC;  Nan, ZD;  Liu, P;  Sun, LX;  Xu, F
关键词: [Ho-2(Ala)(4)(H2O)(8)]Cl-6 ;  [ErY(Ala)(4)(H2O)(8)](ClO4)(6) ;  adiabatic calorimetry ;  heat capacity ;  thermal decomposition
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2002-06-01
DOI: 10.3866/PKU.WHXB20020601
卷: 18, 期:6, 页:481-485
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Two solid complexes of rare-earth compounds with alanine, [HO2(Ala)(4)(H2O)(8)] Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6) (Ala = alanine) were synthesized, and a calorimetric study and thermal analysis for the two complexes were performed through adiabatic calorimetry and thermogravimetry. The low-temperature heat capacities of [HO2(Ala)(4)(H2O)(8)] Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6) were measured with an automated adiabatic precision calorimeter over the temperature range from 78 to 377 K. Solid-solid phase transitions were found between 214 K and 255 K with a peak temperature of 235.09 K for [HO2(Ala)(4)(H2O)(8)] Cl-6, between 99 K and 121 K with a peak temperature of 115. 78 K for [ErY (Ala)(4) (H2O)(8)] (ClO4)(6). The enthalpies and entropies of the phase transitions were determined to be 3.02 kJ . mol(-1), 12.83 J . K-1 . mol(-1) for [HO2(Ala)(4)(H2O)(8)] Cl-6; 1.96 kJ . mol(-1), 16.90 J . K-1 . mol(-1) for [ErY(Ala)(4)(H2O)(8)] (ClO4)(6), respectively. Thermal decomposition of the two complexes were investigated in the temperature range of 40 similar to 800 degreesC by using the thermogravimetric and differential thermogravimetric (TG/DTG) analysis techniques. The TG/DTG curves showed that the decomposition started from 80 degreesC and ended at 479 degreesC, completed in two steps for [HO2 (Ala)(4) (H2O)(8)]Cl-6, and started from 120 degreesC and ended at 430 degreesC, completed in three steps for [ErY(Ala)(4) (H2O)(8)] (ClO4)(6), respectively. The possible mechanisms of the thermal decompositions were elucidated.
关键词[WOS]: HEAT-CAPACITY ;  THERMODYNAMIC PROPERTIES
语种: 英语
WOS记录号: WOS:000176546800001
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139193
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

Recommended Citation:
Liu, BP,Tan, ZC,Nan, ZD,et al. Calorimetric study and thermal analysis of [Ho-2(Ala)(4)(H2O)(8)]Cl-6 and [ErY(Ala)(4)(H2O)(8)] (ClO4)(6)[J]. ACTA PHYSICO-CHIMICA SINICA,2002,18(6):481-485.
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