关键词: 铵化合物, 钠离子, 冠式化合物, 相变, 电解质, 扩散系数, 氧杂环化合物, 计时电位法, 二烯烃 P, 四苯硼酸

The mechanism of Na+ transfer facilitated by a new crown ether (24-crown-8, I) was studied by chronopotentiometry and current-scan-polarog. The charge transfer process of Na+ is neither a chem. nor an electrochem. mechanism. Furthermore, the facilitated transfer of Na ions is reversible, which was verified by various experimental methods. The average diffusion coefficient of I in the 1,2-dichloroethane (DCE) phase is 7.8 ?10-6 cm2/s, and the stability constant of the Na+-I complex in the DCE phase is log KNa+-I = 3.97. The square root of transfer time of Na+ was related to the concns. of Na+ and I which could be used for determing Na+ and I.

Key words: AMMONIUM COMPOUND, SODIUM ION, CROWN ETHER COMPOUNDS, PHASE TRANSFORMATION, ELECTROLYTE, DIFFUSION COEFFICIENTS, OXYGEN HETEROCYCLICS, CHRONOPOTONTIOMETRY, DIENE P, TETRAPHENYLBORATE