冠醚配合物的研究 XI: 若干苯并-18-冠-6甲基衍生物液膜传输碱金属离子

本文研究了2,3-苯并-11-甲基-18-冠-6,2,3-苯并-8,15-二甲基-18-冠-6和2,3-苯并-8, 11, 15-三甲基-18-冠-6的氯仿液膜对Na^+, K^+, Rb^+的传输速率。结果指出,传输速率随膜相冠醚浓度增是加而增加, 两者成线性关系; 当冠醚的醚环上甲基数增加则传输速率减小; 对同一冠醚, 不同金属离子的传输速率与相应配合物稳定常数的大小顺序有一致关系; 冠醚传输金属离子时, 阴离子一起迁移, 阴离子水合能力越强则传输能力越小; 传输速率与搅拌速度成线性关系。

Studies on coordination compounds of crown ethers XI. Liquid membrane transport of alkaline metal lons by methylderivatives of benzo-18-crown-6

The liquid membrane transport rate of Na+, K+ and Rb+ was studied in chloroform with 2,3-benzo-11-methyl-18-crown-6, 2,3-benzo-8,15-dimethyl-18-crown-6 and 2,3-benzo-8,11,15-trimethyl-18-crown-6 as ion carriers. The results show that the transport rate increases with increasing crown concentration and the relationship between them is linear, but decreases when no. of Me group in the ring of crowns increase. For the identical crown, the magnitude of transport rate of different metal ions and those of stability constants of corresponding complexes have the same sequence. The crown transport metal ions with accompanying anions and the stronger the hydration ability of anions, the less the transport rate. The relationship between transport rate and stirring rate is linear.