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题名: Low-temperature heat capacities and standard molar enthalpy of formation of the complex Zn(Phe)(NO3)(2)center dot H2O(s)
作者: Di You-Ying;  Gao Sheng-Li;  Tan Zhi-Cheng
关键词: Zn(Phe)(NO3)(2)center dot H2O(s) ;  adiabatic calorimetry ;  low-temperature heat capacity ;  solution-reaction calorimetry ;  standard molar enthalpy of formation
刊名: ACTA PHYSICO-CHIMICA SINICA
发表日期: 2007-09-01
DOI: 10.3866/PKU.WHXB20070924
卷: 23, 期:9, 页:1437-1441
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: Low-temperature heat capacities of the complex Zn(Phe)(NO3)(2) . H2O(s) (Phe: phenylalanine) have been precisely measured with a small sample precision automated adiabatic calorimeter over the temperature range from 78 to 370 K. The initial dehydration temperature of the complex (T-0=(324.27 +/- 0.37) K) has been obtained by means of the analysis of the heat capacity curve. The experimental values of molar heat capacities have been fitted to a polynomial equation of heat capacities (C,,,) vs the temperature (T) with the least square method. The smoothed heat capacities and the thermodynamic functions of the complex have been calculated on the basis of the equation. In accordance with Hess law, dissolution enthalpies of the mixtures {ZnSO4 . 7H(2)O(s)+2NaNO(3)(s)+L-Phe(s)} and {Zn(Phe)(NO3)(2) . H2O(s)+ Na2SO4(s)} in 2 mol . L-1 HCl were measured to be: Delta dH(m.1)(0) = -(69.42 +/- 0.05) kJ . mol(-1) and Delta dH(m.2)(0) =(48.14 +/- 0.04) kJ . mol(-1), by using an isoperibol solution-reaction calorimeter. Furthermore, the standard molar enthalpy of formation for the complex was determined as, Delta H-f(m)0=-(1363.10 +/- 3.52) kJ . mol(-1), by designing a thermochemical cycle. In addition, the reliability of the designed thermochemical cycle has been verified by UV-Vis spectroscopy and the data of the refractive indices.
关键词[WOS]: AMINO-ACIDS ;  CALORIMETER
语种: 英语
WOS记录号: WOS:000249570000024
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140491
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.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Liaoning Provin, Peoples R China

Recommended Citation:
Di You-Ying,Gao Sheng-Li,Tan Zhi-Cheng. Low-temperature heat capacities and standard molar enthalpy of formation of the complex Zn(Phe)(NO3)(2)center dot H2O(s)[J]. ACTA PHYSICO-CHIMICA SINICA,2007,23(9):1437-1441.
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