镧系离子与α—氨基丙酸配合物的^(13)C NMR波谱及其结构的研究

Studies on ^(13)C NMR Spectra and Structure of Lanthanide Alaninate Complexes

本文以XL-200型超导核磁共振谱仪对镧系离子与α-氨基丙酸配合物体系进行了研究,测得微酸性条件下配合物中各^(13)C核的诱导化学位移值,以独立结构法将诱导位移进行分离得到配合物生成位移、接触位移及准接触位移。分析这些不同性质的位移贡献得出镧系离子在磁学性质上同样存在“四分组现象”及“钆断效应”。以准接触位移为依据,对配合物的结构进行计算机模拟,取得了一些有意义的结果。

The ^(13)C NMR of lanthanide α-alaninate coordination oompounds have teen studied by XL-200 NMR speotrometer under weakly acidic condition. The chemical shifts obtained are separated into coordination compound formation shift, contact shift and pseudo-contact shift by the method of 'Independent Struoture'. According to the contribution of different shifts, it is revealed that 'tetrad phenomenon' and 'gadolium break effect' of lanthanides also appear in its magnetic properties. The structures of coordination compounds are simulated by computer based on the pseudocontact shift. Some interesting results are obtained and discussed.