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题名: Low temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)(NO3)(2)center dot 1/2H(2)O(s) (His = L-alpha- Histidine)
作者: Yang, Wei-Wei1;  Di, You-Ying1;  Kong, Yu-Xia1;  Tan, Zhi-Cheng2;  Gao, Sheng-Li3
关键词: Adiabatic calorimetry ;  Heat capacity ;  Standard molar enthalpy of formation ;  Zinc ;  Amino acids ;  Isoperibol solution-reaction calorimetry
刊名: INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY
发表日期: 2010-03-10
卷: 49, 期:3, 页:295-301
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: Low temperature heat capacities of the solid coordination compound Zn(His)(NO3)(2)center dot 1/2H(2)O(s) have been measured by a precision automated adiabatic calorimeter over the temperature range 78 - 371 K. The initial dehydration temperature of the coordination compound is determined to be, T-D = 326.75 K, by analysis of the heat-capacity curve. The experimental values of the molar heat capacities in the temperature region have been fitted to a polynomal equation of heat capacities with the reduced temperature (X), [X = f (T)], by least squares method. Enthalpies of dissolution of {ZnSO4 center dot 7H(2)O(s) + 2NaNO(3)(s) L-His(s)} and {Zn(His)(NO3)(2)center dot 1/2H(2)O(s) + Na2SO4(s)} in 100 ml of 2 mol dm(-3) HCl(aq) at T = 298.15 K have been determined to be Delta H-4(m,1)0 = 79.830 +/- 0.058 kJ mol(-1) and Delta H-d(m,2)0 = 51.146 +/- 0:041. kJmol(-1) respectively, with a isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the compound is determined as Delta H-f(m)0(Zn(His)(NO3)(2)center dot 1/2H(2)O, s, 298.15 K) = - 1207.19 +/- 2.82 kJ mol(-1) from the enthalpies of dissolution of the reactants and products and other thermodynamic data by a Hess thermochemical cycle. Furthermore, the reliability of the Hess thermochemical cycle has been verified by comparing UV/vis spectra and the refractive indices of solutions obtained from dissolution of the {ZnSP4 center dot 7H(2)O(s) + 2NaNO(3)(s) + L-His(s)} and from dissolution of the {Zn(His)(NO3)(2)center dot 1/2H(2)O(s) + Na2SO4(s)} mixtures.
关键词[WOS]: ZINC-SULFATE ;  AMINO-ACIDS ;  CALORIMETER
语种: 英语
WOS记录号: WOS:000275972000003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/142014
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, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China
3.NW Univ Xian, Dept Chem, Xian 710069, Peoples R China

Recommended Citation:
Yang, Wei-Wei,Di, You-Ying,Kong, Yu-Xia,et al. Low temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)(NO3)(2)center dot 1/2H(2)O(s) (His = L-alpha- Histidine)[J]. INDIAN JOURNAL OF CHEMISTRY SECTION A-INORGANIC BIO-INORGANIC PHYSICAL THEORETICAL & ANALYTICAL CHEMISTRY,2010,49(3):295-301.
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