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Kinetic analysis of thermogravimetric data XIX. Study of the thermal decomposition of some hexathiocyanatochromates

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Abstract

Ammonium and metal salts of the acid H3[Cr(NCS)6] have been obtained and characterized. Their thermal decomposition has been studied with a derivatograph. The thermal decomposition of the ammonium salts begins with an endothermic stage, leading to the formation of the intermediate Cr(NCS)3, which in exothermic processes finally yields Cr2O3. The decomposition of the metal salts is exothermal and the polarizing effect of the cation plays an important part in this. Kinetic parameters have been derived by means of the nomogram method.

Zusammenfassung

Ammonium- und Metallsalze der Säure H3[Cr(NCS)6] wurden hergestellt und charakterisiert. Ihre thermische Zersetzung wurde mit einem Derivatographen verfolgt. Sie beginnt beiden Ammoniumsalzen mit einer endothermen Phase, welche zur Bildung des Zwischenprodukts Cr(NCS)3 führt, das in exothermen Vorgängen als Endprodukt Cr2O3 ergibt. Die Zersetzung der Metallsalze ist exotherm und der Polarisationseffekt des Kations spielt hierbei eine wichtige Rolle. Kinetische Parameter wurden nach der Nomogramm-Methode abgeleitet.

Резюме

Получены и охарактер изованы аммониевые с оли и соли металлов кислот ы H3[Cr(NCS)6]. С помощью дериват ографа изучено их термическое разложе ние. Разложение аммониевых солей нач инается с эндотермич еской стадии, приводящей к о бразованию промежуточного прод укта Cr(NCS)6, который в экзотермическом про цессе дает Сг2О3. Разложение других со лей протекает по экзотермическому пр оцессу и главную роль при этом играет поляриза ционное влияние кати она.

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Authors and Affiliations

  1. Department of Inorganic Chemistry, Technical University, H-1521, Budapest, Hungary

    G. Liptay & E. Brandt-Petrik

  2. Faculty of Chemical Technology, “Babes-Bolyai” University, Cluj-Napoca, Romania

    Cs. Várhelyi & J. Zsakó

Authors
  1. G. Liptay
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  2. Cs. Várhelyi
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  3. E. Brandt-Petrik
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  4. J. Zsakó
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Liptay, G., Várhelyi, C., Brandt-Petrik, E. et al. Kinetic analysis of thermogravimetric data XIX. Study of the thermal decomposition of some hexathiocyanatochromates. Journal of Thermal Analysis 22, 205–211 (1981). https://doi.org/10.1007/BF01915266

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  • DOI: https://doi.org/10.1007/BF01915266

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