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Use of emanation thermal analysis and evolved gas analysis in thermal study of zinc(II) benzoate complex compounds

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Abstract

Thermal behaviours of three zinc(II) benzoate complex compounds (two new with caffeine and urea), namely Zn(C6H5COO)2, Zn(C6H5COO)2·caf2, Zn(C6H5COO)2·u2, were characterized by using thermogravimetry (TG/DTG), differential thermal analysis (DTA), evolved gas analysis (EGA) with mass spectrometry (MS) detection and emanation thermal analysis (ETA). Temperature intervals of the stability of the compounds as well as the mechanisms of their thermal degradation were determined. From TG and DTA results it followed that the oxidative degradation of urea with CO2 or caffeine with CO2 from the investigated Zn(II) benzoate complex compounds takes place as the first step of their thermal degradation. In the second step of thermal degradation diphenylketone was release. The evolved gas analysis has been used to determine intermediate products of thermal degradation and temperature ranges of their evolution from the samples. From the emanation thermal analysis results it followed that changes in the surface area and microstructure accompanied the thermal degradation of the compounds studied and that no microstructure changes can be supposed in the resulting zinc oxide on heating from 650 up to 850 °C.

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Acknowledgements

This work was supported by the Ministry of Education of the Slovak Republic (Project VEGA No. 1/0122/08) and by the Ministry of Education, Youth and Sports of the Czech Republic (Project INGO No. LA-292). This financial support is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, P. J. Šafarik University, Moyzesova 11, 041-54, Košice, Slovak Republic

    Lenka Findoráková & Katarína Győryová

  2. Institute of Inorganic Chemistry ASCR, 250 68, Řež, Czech Republic

    Eva Večerníková

  3. Nuclear Research Institute Řež plc, 250 68, Řež, Czech Republic

    Vladimír Balek

Authors
  1. Lenka Findoráková
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  2. Katarína Győryová
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  3. Eva Večerníková
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  4. Vladimír Balek
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Correspondence to Lenka Findoráková.

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Findoráková, L., Győryová, K., Večerníková, E. et al. Use of emanation thermal analysis and evolved gas analysis in thermal study of zinc(II) benzoate complex compounds. J Therm Anal Calorim 98, 765–769 (2009). https://doi.org/10.1007/s10973-009-0393-9

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  • DOI: https://doi.org/10.1007/s10973-009-0393-9

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