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Abstract <p>Ionic liquids were synthesized: 1-alkylpyridinium bromotrichloroferrates(III) [C<sub>5</sub>H<sub>5</sub>N–R]FeCl<sub>3</sub>Br, where R = H, C<sub>2</sub>H<sub>5</sub>, C<sub>4</sub>H<sub>9</sub>, C<sub>6</sub>H<sub>13</sub>, C<sub>8</sub>H<sub>17</sub>, C<sub>10</sub>H<sub>21</sub>, C<sub>12</sub>H<sub>25</sub>, or C<sub>16</sub>H<sub>33</sub>. All compounds were characterized by IR and visible spectroscopy data. Their thermal stability in air was studied in the temperature range of 25–600°C, as well as the thermal stability of 1-alkylpyridinium bromides. The influence of the alkyl chain length in the cation and the nature of the anion on the thermal stability of ionic liquids was established. A comparative analysis of the thermal stability of 1-alkylpyridinium bromides and bromotrichloroferrates was carried out. For ionic liquids with long-chain radicals, the critical micelle concentration was determined by conductometry. Surface tension isotherms were obtained and the main colloid-chemical properties were calculated.</p>

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Synthesis, Thermal Stability, and Colloid-Chemical Properties of Pyridinium Ionic Liquids with the Bromotrichloroferrate Anion

  • 期刊论文

  • 发表日期：

    2025年5月21日

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  • O. E. Zhuravlev,
  • A. D. Kaftanov,
  • L. I. Voronchikhina

摘要

Abstract

Ionic liquids were synthesized: 1-alkylpyridinium bromotrichloroferrates(III) [C5H5N–R]FeCl3Br, where R = H, C2H5, C4H9, C6H13, C8H17, C10H21, C12H25, or C16H33. All compounds were characterized by IR and visible spectroscopy data. Their thermal stability in air was studied in the temperature range of 25–600°C, as well as the thermal stability of 1-alkylpyridinium bromides. The influence of the alkyl chain length in the cation and the nature of the anion on the thermal stability of ionic liquids was established. A comparative analysis of the thermal stability of 1-alkylpyridinium bromides and bromotrichloroferrates was carried out. For ionic liquids with long-chain radicals, the critical micelle concentration was determined by conductometry. Surface tension isotherms were obtained and the main colloid-chemical properties were calculated.