Synthesis and Characterization of Task-specific Schiff-base Ionic Liquid

Task-specific Schiff-base ionic liquid with double reactivity centers was prepared by step synthesis. Firstly, Fe-based ionic liquid with the functional group of -NH2 was synthesized by the reaction of 1-propylamine-3-methylimdazolium chloride and FeCl3. Secondly, Schiff-base ligand H2L was prepared by the reaction of 1,3-diamino-2-hydroxypropane and 3,5-di-tert-butylsalicylaldehyde, and its cobalt complex CoL was also prepared. Complex CH2Cl-CoL with the functional group of -CH2Cl was synthesized by the reaction of 4-chlorobutyryl chloride and complex CoL. Finally, task-specific Schiff-base ionic liquid was prepared by the reaction between -NH2 and -CH2Cl of the above two compounds. The compounds synthesized were characterized by elemental analysis, infrared spectrometry (IR), UV-Visible spectroscopy (UV-Vis), H-1 nuclear magnetic resonance spectra (H-1 NMR), Mass spectrometry(MS), inductively coupled plasma mass spectrometry(ICP-MS) and Raman spectrometry. Task-specific Schiff-base ionic liquid was confirmed to be prepared successfully and to be composed by Schiff-base Co complex cation and Fe complex anion.