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前言冠醚与各类阳离子相互作用强烈,并显示出特有的活性,已有许多论文报道了有关与阳离子的络合能力,相转移催化,离析,迁移,金属阳离子的分析等方面的研究。为了改善这些功能,设法在冠醚环上引入许多种不同的取代基,或改变冠醚环。由氧乙烯单元组成的冠醚环起亲水基作用,因此,有一个与亲水性平衡的长链烷基的冠醚显示表面活性。这些新型非离子表面活性化合物甚至在水中也能与金属阳离子络合,并呈现出异乎寻常的现象,而这种现象不为已知的开链聚氧乙烯非离子表面活性剂所有,因此,已引起了人们
INTRODUCTION Crown ethers strongly interact with various cations and exhibit unique activities. Many papers have reported on complexation with cations, phase transfer catalysis, segregation, migration and metal cation analysis. To improve these functions, try to introduce many different substituents on the crown ether ring, or to change the crown ether ring. Crown ether rings composed of oxyethylene units function as hydrophilic groups and therefore have a surface ether with a long-chain alkyl-terminated crown ether that is hydrophilic in equilibrium. These novel nonionic surface-active compounds complex with metal cations even in water and exhibit an extraordinary phenomenon which is not known to the known open-chain polyoxyethylene nonionic surfactants and therefore have been Cause people