【摘要】 本文利用pH电位法在μ=0.10及不同温度下测定l-天冬氨酸和d.l-天冬酰胺的质子化常数、钇和其它十四个稀土元素与上述配体生成配合物的稳定常数,并研究了水-有机溶剂对天冬氨酸钇稳定性的影响,探讨了钇的位置与“四分组效应”等问题。更多还原

【Abstract】 In this paper protonation constants of the title ligands at various temperatures as well as stability constants(K1, K2) of its chelates with rare earth elements in H2O and in mixed solvents were determined potentiometrically at 30℃ and at ionic strength of 0.10. The calculations of these constants were carried out by different methods on DJS-131 electronic computer, the data have been also treated by a least-squares method. Two important facts can be observed from the results obtained. First, there is an apparent "tetrad effect" in both systems. The second fact to observe is the shift of the y position from its usual Ho-Er region to the vicinity of Gd (for aspartic) and Nd (for asparagine system). It can be reasonably explained by the different polarizability between the lanthanides and yttrium ion.更多还原