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题名: Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)
作者: Di, YY;  Tan, ZC;  Yu, HG;  Gao, SL;  Liu, Y;  Sun, LX
关键词: Zn(HiOSO(4)center dot H2O(s) ;  adiabatic calorimetry ;  isoperibol solution-reaction calorimetry ;  standard molar enthalpy of formation ;  UV/Vis spectroscopy
刊名: THERMOCHIMICA ACTA
发表日期: 2004-03-23
DOI: 10.1016/j.tca.2003.09.022
卷: 412, 期:1-2, 页:171-177
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: Low-temperature heat capacities of the solid coordination compound Zn(His)SO4.H2O(S) were precisely measured by a precision automated adiabatic calorimeter over the temperature range between T = 78 and 373K. The initial dehydration temperature of the coordination compound was determined to be, T-d = 324.20 K, by analysis of the heat-capacity curve. The experimental values of molar heat capacities were fitted to a polynomial equation of heat capacities (C-p,C-m) with the reduced temperatures, x (x = f(T)), by least square method. Enthalpies of dissolution of the ZnSO4 . 7H(2)O(s) + His(s) (Delta(d)Hm,1degrees) and the Zn(His)SO4 . H2O(s) (Delta(d)H(m,2)degrees) in 100.00 ml of 2 mol l(-3) HCl(aq) at T = 298.15 K were determined to be, Delta(d)H(m,1)degrees = -(13.129 +/- 0.013) kJ mol(-1) and Delta(d)H(m,2)degrees = -(11.271 +/- 0.012) kJ mol(-1), by means of a homemade isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the compound was determined as: Delta(f)H(m)degrees (Zn(His)SO4 . H2O, s, 298.15 K) = - (1827.61 +/- 12.3 1) kJ mol(-1) from the enthalpies of dissolution and other auxiliary thermodynamic data through a Hess thermochemical cycle by using the homemade isoperibol calorimeter. Furthermore, the reliability of the designed Hess thermochemical cycle was verified by comparing between UV/Vis spectra and the refractive indexes of Solution A (from dissolution of the [ZnSO4 . 7H(2)O(S) + His(s)] mixture in 2 mol l(-3) hydrochloric acid) and Solution A' (from dissolution of the complex Zn(His)SO4 . H2O(S) in 2 mol l(-3) hydrochloric acid). (C) 2003 Published by Elsevier B.V.
关键词[WOS]: CALORIMETER
语种: 英语
WOS记录号: WOS:000220132200022
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139358
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,Tan, ZC,Yu, HG,et al. Low-temperature heat capacities and standard molar enthalpy of formation of the coordination compound Zn(His)SO4 center dot H2O(s) (His = L-alpha-histidine)[J]. THERMOCHIMICA ACTA,2004,412(1-2):171-177.
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