| 102 kinds of new benzimidazolium ionic liquids were synthesized and the structures were characterized by IR spectroscopy and elemental analysis, and 17 single crystals of the ionic liquids were obtained and characterized by single crystal X-ray diffraction. The melting points, conductivities, liquid crystals and magnetic properties were studied and the relationships of the structures and properties were infered.1. A series of ionic liquids of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)2-bim]X (bim= benzimidazole) [n=4, 6, 8, 10, 12, 14; X = F-, Cl-, Br-, NO3-, BF4-, ClO4-, HSO4-, H2PO4- and SiF62-] were synthesized and the structures were characterized by IR spectroscopy and elemental analysis. Seven crystal structures such as [(C10H21)2-bim]BF4 and [(C12H25)2-bim]2SiF6 were characterized by single crystal X-ray diffraction. The liquid crystalline behaviors of those compounds were examined by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Particularly, the ionic liquids [(C12H25)2-bim]HSO4 and [(C12H25)2-bim]H2PO4 displayed liquid crystal smectic A phase (SmA).2. A series of copper-containing ionic liquids of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)2-bim]2[CuCl4] (n = 4, 6, 8, 10, 12, 14) were synthesized and the structures were characterized by IR spectroscopy and elemental analysis. Crystal [(C8H17)2-bim]2[CuCl4], [(C10H21)2-bim]2[CuCl4] and [(C12H25)2-bim]2[CuCl4] were characterized by single crystal X-ray diffraction. Thermal analysis and conductivity of the series of ionic liquids were studies.3. A series of cobalt-containing liquid crystals of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)-bim]2[CoCl2] and [(CnH2n+1)2-bim]2[Co(SCN)4] (n = 4, 6, 8, 10, 12, 14) were synthesized and the structures were characterized by IR spectroscopy and elemental analysis. Four crystal structures such as [(C8H17)-bim]2[CoCl2] and [(C12H25)2-bim]2[Co(SCN)4] were characterized by single crystal X-ray diffraction. The liquid crystalline behaviors and thermal stability of those complex were examined by DSC, TG/DTG and POM. Particularly, some ionic liquids such as [[(C8H17)-bim]2[CoCl2] and [(C12H25)2-bim]2[Co(SCN)4] displayed liquid crystal smectic A phase (SmA). The electrical conductivity of [(C12H25)2-bim]2[Co(SCN)4] in different solvents and the magnetic properties of [(C12H25)-bim]2[CoCl2] and [(C12H25)2-bim]2[Co(SCN)4] were studied.4. A series of iron-, manganese- and zinc-containing ionic liquids of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)2-bim]MCl4 (n = 4, 6, 8, 10, 12, 14, M for iron, manganese, zinc) were synthesized and the structures were characterized by IR spectroscopy and elemental analysis. Crystal [(C4H9)2-bim]FeCl4 was characterized by single crystal X-ray diffraction, and thermal stability and conductivity of the complex were examined. The electrochemical properties of [(C4H9)2-bim]FeCl4 bulk-modified carbon paste electrode had been studied, and the results indicated that it had good electrocatalytic activities toward the hydrogen peroxide and bromate.5. A series of cadmium-containing ionic liquids of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)2-bim]2[Cd2Cl6] (n = 4, 6, 8, 10, 12, 14) were synthesized and the structures were characterized by IR spectrum and elemental analysis. Crystal [(C10H21)2-bim]2[Cd2Cl6] was characterized by single crystal X-ray diffraction, and thermal stability and conductivity of the complex were examined. The electrochemical properties of [(C10H21)2-bim]2[Cd2Cl6] bulk-modified carbon paste electrode had been studied, and the results indicated that it had good electrocatalytic activities toward the reduction of the hydrogen peroxide, nitrite, bromate and trichloroacetic acid.6. A series of Ln-containing ionic liquids of N,N'-dialkylbenzimidazolium salts of [(CnH2n+1)2-bim]3[Ln(NO3)6] (n = 4, 6, 8, 10, 12, 14, Ln for La and Y) were synthesized and the structures were characterized by IR spectroscopy and elemental analysis. Crystal [(C4H9)2-bim]3[La(NO3)6] were characterized by single crystal X-ray diffraction, and thermal stability and conductivity of the complex were examined. The electrochemical properties of [(C4H9)2-bim]3[La(NO3)6] bulk-modified carbon paste electrode had been studied, and the results indicated that it had good electrocatalytic activities toward the reduction of the hydrogen peroxide, nitrite, bromate and trichloroacetic acid.7. The ionic liquid [(C12H25)2-bim]Br was used as catalyst in the reaction of synthesizing the derivatives of benzil from aromatic aldehydes, which showed better catalytic effect, mild reaction conditions and higher yield.
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