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Synthesis, Structural Characterization, and Thermochemistry of Zinc Hydrogen Pyridine 2,6-Dicarboxylate

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Abstract

Zinc hydrogen pyridine 2,6-dicarboxylate trihydrate (Zn(HDPC)2 · 3H2O) was synthesized. The composition and crystal structure of the complex were determined by chemical analysis, elemental analysis, and X-ray crystallography. Low-temperature heat capacities of the complex were measured with a small sample automated adiabatic calorimeter over the temperature range from 78 K to 379 K. The experimental heat capacities of the complex were fitted by the least-squares method, and a polynomial equation of experimental molar heat capacities versus reduced temperature was obtained. The smoothed molar heat capacities and thermodynamic functions of the complex relative to the standard reference temperature 298.15 K were calculated based on the fitted polynomial equation. A reasonable thermochemical cycle was designed, and the standard molar enthalpies of dissolution for the reactants and products of the synthesis reaction in a selected solvent were measured by an isoperibol solution-reaction calorimeter. The enthalpy change of the synthesis reaction of the titled compound was calculated to be −(15.95 ± 0.43) kJ · mol−1. Eventually, the standard molar enthalpy of formation of the title complex was derived to be −(2582.60 ± 3.02) kJ · mol−1 by the Hess thermochemical cycle. In addition, the reliability of the designed thermochemical cycle was verified by UV–Vis spectroscopy.

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Authors and Affiliations

  1. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, Shandong, People’s Republic of China

    Wen-Wen Zhong, You-Ying Di & Wei-Wei Yang

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  1. Wen-Wen Zhong
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  2. You-Ying Di
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  3. Wei-Wei Yang
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Correspondence to You-Ying Di.

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Zhong, WW., Di, YY. & Yang, WW. Synthesis, Structural Characterization, and Thermochemistry of Zinc Hydrogen Pyridine 2,6-Dicarboxylate. Int J Thermophys 33, 2323–2338 (2012). https://doi.org/10.1007/s10765-012-1339-1

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  • DOI: https://doi.org/10.1007/s10765-012-1339-1

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