Low-temperature Heat Capacities and Thermodynamic Properties of Solid State Coordination Compound Zn(nicotinate)_2·H_2O(s)

作     者：CHEN Jing-tao DI You-ying DAN Wen-yan HONG Yuan-ping YANG Wei-wei KONG Yu-xia HE Dong-hua TAN Zhi-cheng 

作者机构：College of Chemistry and Chemical Engineering Liaocheng University Liaocheng 252059 P. R. China Department of Chemistry Shaanxi Educational College Xi ＇an 710061 P. R. China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2009年第25卷第4期

页      面：526-531页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：Supported by the National Natural Science Foundation of China(No.20673050) Key Project of Science Foundation from Shaanxi Educational College of China(No.08KJ017) 

主　　题：Zinc nicotinate Adiabatic calorimeter Heat capacity Phase transition Thermodynamic function 

摘      要：A novel compound-monohydrated zinc nicotinate was prepared via room temperature solid phase synthesis and ball ***,chemical and elemental analyses and X-ray powder diffraction technique were applied to characterizing the structure and composition of the ***-temperature heat capacities of the solid coordination compound were measured by a precision automated adiabatic calorimeter over a temperature range from 77 to 400 K.A solid-solid phase transition process occurred in a temperature range of 321―342 K inferred according to the heat capacity curve,and the peak temperature,molar enthalpy and entropy of the phase transition of monohydrated zinc nicotinate were determined to be Ttrs=（340.584±0.829） K,ΔtrsHm=（12.682±0.041） kJ/mol and ΔtrsSm=（37.235±0.101） KJ/mol）.The experimental values of the molar heat capacities in the temperature regions of 77―321 K and 342―400 K were,respectively,fitted to two polynomial *** addition,the polynomial fitted values of the molar heat capacities and fundamental thermodynamic functions of the sample relative to the standard reference temperature 298.15 K were calculated and tabulated at intervals of 5 K.