| 摘要 |
Ionic liquid and a preparation method thereof are provided, which ionic liquid has the imidazole salt structure containing sulfur atom which enables to easily form a self-assembled monolayer on the surface of gold, and makes it easy to modify properties of the metal surface by exchange of ion. The ionic liquid having the imidazole salt structure containing sulfur atom represented by formula (1) is provided, wherein n is an integer of 1 to 20; R1 is C1-C16 alkyl, aryl or substituted aryl; R2, R3 and R4 are independently hydrogen, C1-C6 alkyl, C3-C8 cyclic alkyl, aryl or substituted aryl in which the substitutent is halogen, C1-C6 alkyl or C1-C6 alkoxy; and X is Cl, Br, I, BF4, PF6, SbF6, NO3, ClO4, OTf or N(Tf)2. The method for preparing the ionic comprises the steps of: (1) reacting imidazol wherein R1, R2, R3 and R4 are substituted at sites 1, 2, 4, 5 with Y-(CH2)n-Z to prepare a compound (II) in which Y and Z are independently Cl, Br or I; (2) reacting the compound (II) with MSC(O)R5 to prepare a compound (III) wherein R5 is C1-C10 alkyl or aryl, and M is an alkali metal; (3) hydrolyzing the compound (III) to prepare a compound (IV); and (4) reacting the compound (IV) with MX.
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