4-二甲氨基吡啶类离子液体的合成、表征及性质研究

The Synthesis, Characterization and Study on Behavior of 4-Dimethylamiopryidinium Ionic Liquids

以4-二甲氨基吡啶为原料,经烷基化后得到2种吡啶盐中间体,通过阴离子交换法制备了6种吡啶类离子化合物,其中5种为离子液体,用1H NMR、IR、TG、DSC进行分析和表征,同时考察了6种物质的吸水性和溶解性.结果表明,离子液体的热分解温度均在300℃以上,置于空气中会微量吸水,极易溶于极性溶剂,不溶或微溶于极性小的溶剂.

Six kinds of pyridine ionic compounds were prepared after anion exchange methods from two intermediates, which were obtained by alkylation of 4-dimethylaminopyridine, among which five were ionic liquids.The synthesized compounds were characterized by 1HNMR, IR, TG and DSC analysis meanwhile water absorption and solubility were also studied. The results showed that the thermal decomposition temperature of ionic liquidswere all above 300℃, absorbing trace water when placed in air, easily soluble in polar solvents, insoluble or slightly soluble in small polar solvents.