稀土与脂肪族Schiff碱多核配合物的合成及波谱

Synthesis and Magnetic Resonance Spectra of Rare Earth Polynuclear Complexes with Aliphatic Schiff Base

在形成多核配合物的诸条件中，认为减小空间位阻颇为重要.设计的直链脂肪族的四甘醇醛与甘氨酸缩合形成的Schiff碱(TAGL)为此提供了有利的条件，且成功地获得了它与稀土离子反应形成的三核配合物(Ln：L=3：1)：[Ln3(TAGL)(NO3)7]CH3OH·nH2O(Ln=La，Nd，Sm，n=1；Ln=Gd，Dy，Yb，Y，n=2).以元素分析，IR，NMR等确[Ln3(TAGL)(NO3)7]CH3OH·nH2O(Ln=La，Nd，Sm，n=1；Ln=Gd，Dy，Yb，Y，n=2).以元素分析，IR，NMR等确证其组成，根据EPR谱探讨了Gd(Ⅲ)配合物的晶体场强，同时见到该类脂肪族Schiff碱及其配合物中δHC-N的质子谱向高场明显位移至～5.10.

Among various factors affecting formation of polynuclear complex, steric hindrance is considered to be especially important. An aliphatic Schiff base (TAGL) from tetraglycol aldehyde and glycine offers a possible means to reduce steric hindrance. Some trinuclear rare earth complexes (Ln:L = 3: 1) were synthesized and their formulas were established as [Ln(3)(TAGL)(NO3)(7)] CH3OH . nH(2)O (Ln = La, Nd, Sm, n = 1; Ln = Gd, Dy, Yb, Y, n = 2) by elemental analysis, IR, NMR, etc. On the basis of EPR spectrum of the obtained Gd( III) complex, the crystal field strength is discussed. In addition, the proton signal of delta (HC=N) in this aliphatic Schiff base showed obvious upfield shift and appeared at similar to 5. 10, which made spectral assignment much easier.