Owing to their unique chemical and physical properties, ionic liquids have caught attention for applications in diverse areas ranging from synthetic and catalytic chemistry to biotechnology, electrochemistry and mater...Owing to their unique chemical and physical properties, ionic liquids have caught attention for applications in diverse areas ranging from synthetic and catalytic chemistry to biotechnology, electrochemistry and material science. For fully using it in reaction, understanding of the physical and chemical properties of the ionic liquids is very important.The ionic liquid 1-butyl-3-methyl imidazolium tetraphenylborate （（[BMIm][BPh4]）） was synthesized in this study.Its structure and stability were determined by （）1H NMR,UV and DSC. The melting point,solubilities and conductivities in different solvents and under different conditions were studied as well.The results showed that 1-butyl-3-methyl imidazolium tetraphenylborate was stable and was characterized as a strong electrolyte. The limiting molar conductivity values of the compound in acetone,acetonitrile,DMF, ethanol and ethyl acetate were 157.53, 171.38, 58.87, 42.04 and 15.02 S·cm2·mol-1, respectively.（[BMIm][BPh4]） had definite catalytic activity in the synthesis of isopentyl acetate.展开更多
A high performance liquid chromatography(HPLC) method was proposed to monitor the synthesis and purification of the 1-alkyl-3-methylimidazolium ionic liquid precursors from alkylation of 1-methylimidazole with alkyl h...A high performance liquid chromatography(HPLC) method was proposed to monitor the synthesis and purification of the 1-alkyl-3-methylimidazolium ionic liquid precursors from alkylation of 1-methylimidazole with alkyl halides and determine the purity of final products.The results showed that separation of 1-methylimidazole from the precursors could be obtained under the HPLC performance conditions such as cation exchange column,acetonitrile/KH2PO4 aqueous solution and 209 nm wavelength.The content of unreacted 1-methylimidazole in the precursors could be easily calculated from their corresponding HPLC peak areas with the calibration curve of 1-methylimidazole.The retention times of the 1-alkyl-3-methylimidazolium ionic liquid precursors decreased with their increasing alkyls,and the ionic liquids with the same cation and different anions had almost the same retention times.展开更多
文摘Owing to their unique chemical and physical properties, ionic liquids have caught attention for applications in diverse areas ranging from synthetic and catalytic chemistry to biotechnology, electrochemistry and material science. For fully using it in reaction, understanding of the physical and chemical properties of the ionic liquids is very important.The ionic liquid 1-butyl-3-methyl imidazolium tetraphenylborate （（[BMIm][BPh4]）） was synthesized in this study.Its structure and stability were determined by （）1H NMR,UV and DSC. The melting point,solubilities and conductivities in different solvents and under different conditions were studied as well.The results showed that 1-butyl-3-methyl imidazolium tetraphenylborate was stable and was characterized as a strong electrolyte. The limiting molar conductivity values of the compound in acetone,acetonitrile,DMF, ethanol and ethyl acetate were 157.53, 171.38, 58.87, 42.04 and 15.02 S·cm2·mol-1, respectively.（[BMIm][BPh4]） had definite catalytic activity in the synthesis of isopentyl acetate.
文摘A high performance liquid chromatography(HPLC) method was proposed to monitor the synthesis and purification of the 1-alkyl-3-methylimidazolium ionic liquid precursors from alkylation of 1-methylimidazole with alkyl halides and determine the purity of final products.The results showed that separation of 1-methylimidazole from the precursors could be obtained under the HPLC performance conditions such as cation exchange column,acetonitrile/KH2PO4 aqueous solution and 209 nm wavelength.The content of unreacted 1-methylimidazole in the precursors could be easily calculated from their corresponding HPLC peak areas with the calibration curve of 1-methylimidazole.The retention times of the 1-alkyl-3-methylimidazolium ionic liquid precursors decreased with their increasing alkyls,and the ionic liquids with the same cation and different anions had almost the same retention times.
