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由于镧系收缩的作用导致稀土元素间分离上的困难;另外,稀土离子与钙离子有相近的离子势,故它们在化学性质上有许多相似之处。因此,关于稀土元素间的分离以及稀土与钙的分离一直是人们感兴趣的研究课题。目前,有关冠醚分离稀土以及对于稀土与钙的分离和竞争配合已有一些报道。我们在研究臂型羧酸冠醚的稀土配合物时发现,其边臂羧基参与配位,并且对半径不同的稀土离子产生了不同的影响,是一种较好的络合剂。为探索稀土元素以及稀土与钙分离的新体系,本工作考察了以羧酸基为边臂的臂型冠醚L对稀土离子及镧与钙的分离作用。
Due to the lanthanide contraction caused by the separation of rare earth elements difficult; In addition, rare earth ions and calcium ions have similar ion potential, so they have many similarities in chemical properties. Therefore, the separation of rare earth elements and the separation of rare earth and calcium has always been a subject of interest. At present, there are some reports about the separation of rare earths from crown ethers and the separation and competition of rare earths and calcium. When we studied the rare earth complexes of arm-type crown ethers, we found that the carboxyl groups on the side arms involved in the coordination and produced different effects on the rare earth ions with different radii. This is a good complexing agent. In order to explore the new system of rare earth elements and the separation of rare earth from calcium, this work investigated the separation of rare earth ions and lanthanum from calcium by arm-type crown ether L with carboxylic acid as the side arm.