| Ionic liquids have been applied successfully in synthesis of organometallic compounds, catalysis, electrochemistry and material chemistry due to their unique properties, such as nonvolatile, nonflamble, high thermal stability and wider electrochemical potential window etc. With the development of ionic liquids, more and more ionic liquids with special function are required to satisfy the various demands and enrich the fundamental theory of ionic liquids. In order to keep up with the trend, thirty-three novel ionic liquids, which haven't been reported, were prepared in the paper. The main contents are as follows:1 Twelve novel ionic liquids based on benzotriazolium were prepared. The cations mainly consist of 1 -ethyl-3-butylbenzotriazolium, 1,3-dibutylbenzotriazolium and two cations with functional group l-(2-hydroxy-ethyl)-3-butylbenzotriazolium, 1-(2-carboxyl-methyl)-3-butylbenzotriazolium. The anions mainly consist of Br",Cl",BF4" and PF6-.They were characterized by FT-IR, 1HNMR, DSC, elemental analysis and their structure and composition were confirmed accordingly. The melting point of them and other physical properties, such as conductivity, solubility, water content and thermal stability were determined. Synchronously, electrochemical potential windows were determined by cyclic voltammogram. Electroredox of ferrocene and naphthalene were also investigated in some ionic liquids with lower melting point. The results show that the ionic liquids exhibit high purity, high conductivity, excellent thermal stability and wider electrochemical potential window. They have potential usage as alternatives to conventional organic solvents in electrochemistry due to their special solubility.2 Twelve novel ionic liquids based on benzimidazolium were prepared. The cationsmainly consist of 1-ethyl-3-butylbenzimidazolium, 1-ethyl-3-pentylbenzimidazolium, and two cations with functional group 1-ethyl-3-(2-hydroxy-ethyl)benzimidazolium, 1-ethyl-3-(2- carboxyl-methyl) benzimidazolium. The anions mainly consist of Br-,C1-,BF4- and PF6-.They were characterized by FT-IR, 1HNMR, DSC, elemental analysis and their structure and composition were confirmed accordingly. Their physical properties such as melting point, conductivity, solubility, water content and thermal stability were determined. Synchronously, electrochemical stability of them was determined by cyclic voltammogram. The results show that these ionic liquids exhibit high conductivity, excellent thermal stability and wider electrochemical potential window.3 Five new compounds were prepared by combining the phthalimide anion with some common cations. Their structures and compositions were confirmed by the characterization of FT-IR, 1HNMR. Synchronously, their melting point, solubility and thermal stability were determined. The results show that the melting points of them are high. To the cations of large volume like imidazolium, if the volume of anions exceeds the bound, the melting points of the compounds will increase. So, only the combination of proper cations and anions will produce the compounds of low melting points.4 Three new binary room-temperature ionic liquids based on imidazole and quaternization salts including (Bu)4NBr/imidazole, (Et)4NBr/imidazole and Choline chloride/imidazole were prepared. Their phase diagrams were obtained by determination of STDA. Their physical properties such as conductivity and viscosity were determined. Synchronously, electrochemical stability of them was determined by cyclic voltammogram. The results show that quaternization salts and imidazole can form the homogenous liquids at low temperature. When the molar ratio of (Bu)4NBr/imidazole is 1:4, the deep melting point is 10℃; The molar ratio of (Et)4NBr/imidazole is 1:4, the deep melting point is 45℃ ; The molar ratio of Choline chloride /imidazole is 3:7, the deep melting point is 53℃. The ionic liquids exhibithigher conductivity and lower viscosity. Both the conductivity and viscosity of ionic liquids fit to the Arrhenius equation. Excell...
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