六元瓜环与系列镧系金属离子的相互作用

Interaction of Cucurbit[6]uril with Ln( III)

本文通过单晶X-射线衍射方法考察了六元瓜环(Q[6])与系列镧系金属离子在硝酸镉(Cd(NO3)2)存在条件下的相互作用。实验结果表明:(Q[6])只与镧系金属中的镧(La)、铈(Ce)、镨(Pr)、钕(Nd)四种离子配位,形成1∶1的配合物,而与其余的稀土金属离子不发生直接配位作用,这一特性有可能用于轻稀土离子与重稀土离子分离的应用。

The interaction of cucurbit [ 6 ] uril （ Q [ 6 ] ） with lanthanide cations （ Ln^3＋） in the presence of Cd （NO3）2 has been investigated by using single crystal X-ray diffraction analysis. The experiment results showed that the Q [ 6 ] molecule can only coordinate with the first four light lanthanide cations La^3＋ , Ce^3＋, Pr^3＋, Nd^3＋ and form 1 ： 1 Q [ 6 ]/Ln^3＋ coordination complexes respectively, whereas Q [ 6 ] can not directly coordinate with the rest lanthanide cation, suggesting that the light lanthanide cations could be isolated from their heavy counterparts.