【摘要】 应用线性扫描循环伏安法、方波循环伏安法和计时电量法测定苯甲醛在3种离子液体C4M IMBF4、C6M IMBF4和C8M IMBF4中的电化学行为.实验表明,在C4M IIVIBF4离子液体中苯甲醛于GC电极上的还原包含两个连续、不可逆单电子过程,对应的方波I~E曲线峰电位Ep为-1.39 V和-1.69 V,估算的扩散系数分别为D1=1.5×10-8cm2/s和D2=1.3×10-8cm2/s.而在C6M IMBF4和C8M IMBF4离子液体中,则苯甲醛于GC电极仅显示一个电流峰,这可能是因为C4M IMBF4的碱性较C6M IMBF4和C8M IMBF4弱的缘故;而电流的衰减时间亦依C4M IMBF4,C6M IMBF4,C8M IMBF4,次序增长,并会导致更慢的异相动力学过程.更多还原

【Abstract】 In this paper,the electrochemical reduction of benzaldehyde was investigated in C₄MIMBF₄、(C₆MIMBF₄) and C₈MIMBF₄ ionic liquids by cyclic linear sweep voltammetry,cyclic square-wave voltammetry and chronocoulometry.Benzaldehyde exhibits two successive one-electron irreversible reduction(E_P1=-1.39 V,E_P2=1.69 V) with GC electrode in C₄MIMBF₄,the voltammetric data for benzaldehyde give diffusion coefficients of 1.5 10^-8cm²/s and 1.3 10⁸cm²/s.There is one current peak in C₆MIMBF₄and C₈MIMBF₄ ionic liquids due to their stronger alkalinity then C₄MIMBF₄.The decay time of the charging current became longer in C₄MIMBF₄、C₆MIMBF₄、C₈MIMBF₄,and slower heterogeneous kinetics in(C₆MIMBF₄) and C₈MIMBF₄ ionic liquids.更多还原