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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·H₂O(s)[J]. Acta Physico-Chimica Sinica, ;2007, 23(09): 1437-1441. doi: 10.3866/PKU.WHXB20070924 shu

Low-temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Complex Zn(Phe)(NO₃)₂·H₂O(s)

1.
College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, Shandong Province, P. R. China; Department of Chemistry, Northwest University, Xi’an 710069, P. R. China; Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China

Received Date: 12 March 2007
Available Online: 21 June 2007

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 (T0=(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 (Cp, m) 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 {ZnSO4·7H2O(s)+2NaNO3(s)+L-Phe(s)} and {Zn(Phe)(NO3)2·H2O(s)+Na2SO4(s)} in 2 mol·L-1 HCl were measured to be: ⊿dH0m,1=(69.42±0.05) kJ·mol-1 and ⊿dH0m,2 =(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, ⊿fH0m =-(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.
- Zn(Phe)(NO3)2·H2O(s); Adiabatic calorimetry; Low-temperature heat capacity; Solution-reaction calorimetry; Standard molar enthalpy of formation
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Low-temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Complex Zn(Phe)(NO3)2·H2O(s)

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通讯作者: 陈斌, bchen63@163.com

Low-temperature Heat Capacities and Standard Molar Enthalpy of Formation of the Complex Zn(Phe)(NO₃)₂·H₂O(s)