The features of iodine loss at high temperatures

The case study of crystalline thiazoloquinolinium polyiodides

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A series of crystalline thiazoloquinolinium iodides has been studied using a combination of thermal analysis, mass and Raman spectroscopy techniques. The influence of composition and polyiodide anion stoichiometry on the features of iodine loss has been revealed. It has been shown that the existence of a bound diiodine molecule in a polyiodide chain leads to significant decrease in melting point and decomposition temperatures in comparison with corresponding mono- and triiodide salts. The loss of the diiodine molecule from the complex polyiodide proceeds independently, without decomposition of the organic cation, while the release of diiodine from the triiodide anion goes simultaneously with thermal decomposition of the cation. In addition, the decomposition processes on the surface of the thiazoloquinolinium polyiodide crystal have been investigated during sample storage. Iodine loss and formation of more stable triiodide have been proved using Raman spectroscopy data.

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This work was supported by grant of Ministry of Education and Science of the Russian Federation (Award No 4.1157.2017/4.6) and by the Government of the Russian Federation, Act 211, contract No. 02.A03.21.0011.

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Correspondence to Irina D. Yushina.

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Yushina, I.D., Pikhulya, D.G. & Bartashevich, E.V. The features of iodine loss at high temperatures. J Therm Anal Calorim 139, 1017–1023 (2020).

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  • Thermal analysis
  • Evolved gas analysis
  • Thermal decomposition
  • Thiazoloquinolinium polyiodides
  • Halogen bonding