稀土与四甘醇醛缩苯丙氨酸Schiff碱配合物的合成、性能与催化

Synthesis, Properties and Catalytic Activity of Rare Earth Complexes with Noncyclic Polyether-phenylalanine Schiff Base

合成了直链醚－氨基酸新型Ｓｃｈｉｆｆ碱（四甘醇醛缩苯丙氨酸Ｓｃｈｉｆｆ碱）及其与稀土新配合物，「Ｌｎ３Ｌ２（ＮＯ３）２」．（ＮＯ３）３．ｎＨ２Ｏ（Ｌｎ＝Ｌａ，Ｎｄ，Ｓｍ，ｎ＝３；Ｌｎ＝Ｇｄ，Ｄｙ，Ｅｒ，Ｙ，ｎ＝５），以元素分析、磁化率、红外光谱、＾１Ｈ ＮＭＲ等进行表征，研究了它们的配位作用，根据预期设想见到此类配合物在有机溶剂中的溶解性有明显改善，以ＥＰＲ波谱探讨了配合物的晶体场强，并计算了晶体场参数，此外，发现在不同加助催化剂条件下，此类配合物对ＭＭＡ（甲基丙烯酸甲酯）聚合有一定的催化效果。

A new Schiff base derived from tetraglycol aldehyde and phenylalanine and its rare earth complexes [Ln3L2(NO3)2](NO3)3·nH2O(Ln= La,Nd,Sm, n = 3;Ln= Gd,Dy,Er,Y, n = 5)have been synthesized and characterized by elemental analyses, magnetic susceptibility, IR and 1H NMR spectroscopy. The solubility of the obtained complexes in organic solvents has been explored and improved apparently. The crystal field strength and its parameters of the Gd( Ⅲ) complex were investigated by EPR spectroscopy. In addition, these complexes display some catalytic activities in the polymerization of methyl methacrylate (MMA) in the absence of any cocatalyst.