Preparation of 1-butyl-3-methylimidazolium salts and study of their phase behavior and intramolecular intractions

Seven organic salts of 1-butyl-3-methylimidazolium with anions Br⁻, BF₄ ⁻, NO₃ ⁻, SO₄ ²⁻, HSO₄ ⁻, SCN⁻, PO₄³⁻ were prepared. Structure of these compounds is elucidated and purity is confirmed. The products are characterized by melting point, thin layer chromatography, data of elemental analysis, cromatomass-, NMR and IR spectroscopy. All these compounds are ionic liquids, five are low temperature ones. Principal thermal characteristics are found that allow accounting for the phase behavior of the prepared compounds at their application. Existence of intramolecular and intermolecular interactions between the heterocyclic anion and inorganic cation in by means of the formation of hydrogen bond is established.