Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (09): 2074.doi: 10.3969/j.issn.0251-0790.2012.09.035

• Physical Chemistry • Previous Articles     Next Articles

Synthesis, Structure Characterization and Thermochemistry of Pyridine-2,6-dicarboxylic Acid Potassium Hydrogen

ZHONG Wen-Wen, DI Ming-Zhe, DI You-Ying   

  1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China
  • Received:2011-10-08 Online:2012-09-10 Published:2012-08-14
  • Contact: You-Ying Di E-mail:diyouying@lcu.edu.cn; diyouying@126.com

Abstract:

Pyridine-2,6-dicarboxylic acid potassium hydrogen(KHDPC) was synthesized and its crystal structure was determined by single crystal X-ray diffraction. Low-temperature heat capacities of the compound were measured with an automated adiabatic calorimeter over the temperature range from 78 K to 360 K. Experimental heat capacities were fitted by least-squares method and a polynomial equation of heat capacities vs. reduced temperature was obtained. The smoothed molar heat capacities and thermodynamic functions of the compound relative to the standard reference temperature 298.15 K were calculated based on the fitted polynomial equation. A reasonable thermochemical cycle was designed on the basis of a designed reaction of the substance, and standard molar enthalpies of dissolution for the reactants and products of the supposed reaction in the selected solvents were measured by an isoperibol solution-reaction calorimeter, respectively. Eventually, standard molar enthalpy of formation of the compound was derived to be -(1052.69±1.52) kJ/mol by Hess thermochemical cycle.

Key words: Pyridine-2,6-dicarboxylic acid potassium hydrogen(KHDPC), Crystal structure, Low-temperature heat capacity, Standard molar enthalpy of formation

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