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题名: Low-temperature heat-capacity and standard molar enthalpy of formation of the coordination compound Zn(Phe)(3)(NO3)(2) center dot H2O(s) [Phe = L-alpha-phenylalanine]
作者: Di, YY;  Yu, HG;  Tan, ZC;  Gao, SL;  Liu, Y;  Sun, LX
关键词: Zn(Phe)(3)(NO3)(2) ;  H2O(s) ;  low-temperature heat capacity ;  adiabatic calorimetry ;  isoperibol solution calorimetry ;  standard molar enthalpy of formation
刊名: JOURNAL OF CHEMICAL THERMODYNAMICS
发表日期: 2003-06-01
DOI: 10.1016/S0021-9614(03)00019-3
卷: 35, 期:6, 页:885-896
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Thermodynamics ;  Chemistry, Physical
研究领域[WOS]: Thermodynamics ;  Chemistry
英文摘要: Low-temperature heat capacities of the coordination compound Zn(Phe)(3)(NO3)(2) . H2O(s) have been precisely measured over the temperature range between T = 78 K and T = 373 K through a small sample precision automated adiabatic calorimeter. Experimental heat capacities have been fitted into a polynomial equation of heat capacities (C-p,C-m) with the reduced temperatures (x), [x = f(T)]. The initial dehydration temperature of the complex (T-d) has been given from analysis of the heat-capacity curve, T-d = 327.25 K. Dissolution enthalpies of [ZnSO4 . 7H(2)O(s) + 2NaNO(3)(s) + 3L-Phe(s)] (Delta(d)H(m,l)(0)) and [Zn(Phe)(3)(NO3)(2) . H2O(s) + Na2SO4(s)] (Delta(d)H(m,2)(0)) in 100 mL of 2 molar HCl at T = 298.15 K have been measured by means of an isoperibol solution calorimeter: Delta(d)H(m,l)(0) = (115.430 +/- 2.797)kJ . mol(-1), Delta(d)H(m,2)(0) = (67.211 +/- 2.147)kJ . mol(-1). The standard molar enthalpy of formation of the complex has been determined to be: Delta(f)H(m)(0) = -(2292.44 +/- 11.12)kJ . mol(-1), through a Hess thermochemical cycle from the results of molar dissolution enthalpies and other auxiliary thermodynamic data. (C) 2003 Elsevier Science Ltd. All rights reserved.
关键词[WOS]: 3 AMINO-ACIDS ;  ZINC NITRATE ;  CALORIMETER
语种: 英语
WOS记录号: WOS:000183357200003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138300
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.Wuhan Univ, Coll Chem & Mol Sci, Wuhan 430072, Peoples R China
3.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China

Recommended Citation:
Di, YY,Yu, HG,Tan, ZC,et al. Low-temperature heat-capacity and standard molar enthalpy of formation of the coordination compound Zn(Phe)(3)(NO3)(2) center dot H2O(s) [Phe = L-alpha-phenylalanine][J]. JOURNAL OF CHEMICAL THERMODYNAMICS,2003,35(6):885-896.
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