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题名: Low-temperature heat capacities and standard molar enthalpy of formation of the solid-state coordination compound trans-Cu(Ala)(2)(s) (Ala = L-alpha-alanine)
作者: Di, You-Ying1;  Chen, Jing-Tao2;  Tan, Zhi-Cheng3
关键词: trans-Cu(Ala)(2)(s) ;  adiabatic calorimetry ;  heat-capacity ;  isoperibol solution-reaction calorimetry ;  standard molar enthalpy of formation ;  UV-vis spectroscopy
刊名: THERMOCHIMICA ACTA
发表日期: 2008-05-30
DOI: 10.1016/j.tca.2008.02.024
卷: 471, 期:1-2, 页:70-73
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 trans-Cu(Ala)(2)(s) have been measured by a precision automated adiabatic calorimeter over the temperature range from T = 78 K to 390 K. The experimental values of the molar heat capacities in the temperature region were fitted to a polynomial equation of heat capacities (C-p,C-m) with the reduced temperatures (X), [X=f(T)], by a least square method. The smoothed molar heat capacities and thermodynamic functions of the complex trans-Cu(Ala)(2)(s) were calculated based on the fitted polynomial. The smoothed values of the molar heat capacities and fundamental thermodynamic functions of the sample relative to the standard reference temperature 298.15 K were tabulated with an interval of 5 K. Enthalpies of dissolution of {Cu(Ac)(2)center dot H2O(s) + 2Ala (s)} and 2:1 HAc (aq) in 100 ml of 2 mol dm(-3) HCl, respectively, and trans-Cu(Ala)(2)(s) in the solvent [2:1 HAc (aq) + 2 mol dm(-3) HCl] at T = 298.15 K were determined to be Delta H-s(m)degrees[Cu(Ac)(2)center dot H2O(s) + 2Ala(s)] = (6.75 +/- 0.04) kJ mol(-1), Delta H-s(m)degrees[2 : 1 HAc(aq)] = -(1.63 +/- 0.01) kJ mol(-1), and Delta H-s(m)degrees[trans-Cu(Ala)(2)(s)] = -(10.24 +/- 0.08) kJ mol(-1) by means of an isoperibol solution-reaction calorimeter. The standard molar enthalpy of formation of the compound was determined as Delta H-f(m)degrees(trans-Cu(Ala)(2)(s), 298.15 K) = -(1038.6 +/- 3.5) kJ mol(-1) from the enthalpies of dissolution and other auxiliary thermodynamic data using a Hess thermochemical cycle. (C) 2008 Elsevier B.V. All rights reserved.
关键词[WOS]: CALORIMETER
语种: 英语
WOS记录号: WOS:000256558400011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141201
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.Shaannxi Educ Coll, Dept Chem, Xian 710061, Peoples R China
3.Chinese Acad Sci, Dalian Inst Chem Phys, Thermochem Lab, Dalian 116023, Peoples R China

Recommended Citation:
Di, You-Ying,Chen, Jing-Tao,Tan, Zhi-Cheng. Low-temperature heat capacities and standard molar enthalpy of formation of the solid-state coordination compound trans-Cu(Ala)(2)(s) (Ala = L-alpha-alanine)[J]. THERMOCHIMICA ACTA,2008,471(1-2):70-73.
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