阳离子型稀土金属有机化合物*

阳离子型金属有机化合物是催化烯烃聚合反应的活性物种，其结构与性质直接影响所得聚合物的微观结构和性能，具有重要的研究价值。对四族金属有机化合物的深入研究也推动了对其他前过渡金属和稀土金属有机化合物的研究。与为数众多的中性及阴离子型稀土金属有机化合物相比，由于具有较高的反应性、合成与分离不易，阳离子型稀土金属有机化合物直到最近才逐渐得到重视。本文介绍了近年来在阳离子型稀土金属有机化合物的合成、结构和催化烯烃聚合反应领域的研究进展。

Cationic Complexes of Rare Earth Metals

The cationic complexes of transition metals serve as catalytically active species for olefin polymerization. Their structures and properties directly influence the resulting polymers in terms of microstructure and function. The intensive investigation about cationic alkyl complexes of group 4 metals has recently prompted interest in cationic early transition metal complexes and rare earth metal complexes. In contrast to the large number of neutral and anionic complexes of rare earth metals, the cationic complexes have remained scarce until recently due to their high reactivity and synthetic difficulties. This review summarizes the recent progress in the synthesis, structural characterization and olefin polymerization catalysis of these cationic complexes of rare earth metals.