Properties and structural features of ionic liquids on a base of 1,2,4-triazoles

Анотація

Potassium salts of 3-mercaptotriazoles with long chain substituents were considered as prospective heterocyclic ionic liquids. Triazoles 1–8 were obtained via early elaborated technique from corresponding fatty acid hydrazides and methyl isothiocyanate (Fig. 1). It should be noted, that desired salts 1–4 have melting temperature below 100 °C and are soluble in water. But! … they are very hygroscopic, difficult to isolate and cannot be stored in air under normal conditions. Therefore, the salts 1–4 were converted into the corresponding ionic forms – triazole precursors 5–8. 5-Alkyl-1,2,4-triazole-3-thiones 5–8 were isolated as white crystalline powders. The crystalline materials were filtered, washed, recrystallized from ethanol, and stored without noticeable decomposition. This synthesis was carried out in ethyl alcohol and water medium without using of complex equipment or special conditions with moderate shortterm heating, which allows to attribute the developed technique to energy-saving technologies.