论文部分内容阅读
本文采用计时电位法和电流扫描极谱法,研究了一种24-冠-8醚DBC所加速的Na~+的界面迁移机理。根据τ~(1/2)不随[1.13t_S~(1/2)+(D_0~(1/2)/r_0)t_S]的增加而增大的事实,证明此过程不是CE机理。由计时电位法及电流扫描极谱法的对数分析证明,所加速的Na~+的正向迁移过程是可逆的。但由反向计时电位法证明,DBC所加速的Na~+的反向迁移受到阻碍,为不可逆过程。求出了DBC在有机相中的平均扩散系数D_9=1.2×10~(-6)cm~2s~(-1)。DBC与Na~+在有机相中生成配合物的稳定常数是1gk Na~+·DBC=3.00。
In this paper, the mechanism of interfacial mobility of Na ~ + accelerated by 24-crown-8 ether DBC was studied by chronopotentiometry and current sweep polarography. According to the fact that τ ~ (1/2) does not increase with [1.13t_S ~ (1/2) + (D_0 ~ (1/2) / r_0) t_S], it is proved that this process is not a CE mechanism. The logarithm analysis of chronopotentiometry and current sweep polarography demonstrated that the accelerated forward migration of Na ~ + is reversible. However, reverse chronopotentiometry demonstrated that the reverse migration of Na ~ + accelerated by DBC was hindered and was an irreversible process. The average diffusion coefficient (DBC) of DBC in organic phase was calculated to be 1.2 × 10 ~ (-6) cm ~ 2s ~ (-1). The stability constant of DBC and Na ~ + in the organic phase is 1gk Na ~ + DBC = 3.00.