pH电位法研究稀土与N—乙酰基—DL—缬氨酸的配位作用

Study on Coordination of Rare Earths with N—Acetyl—DL—Valine

本文以pH电位法在25.0±0.1℃及0.10mol/dm_3(NaClO_4)离子强度下测定了N—乙酰基—DL—缬氨酸的质子化常数,并系统地研究了该配体与十五种稀土元素的配应作用。发现在所研究的pH范围内,生成1:1配合物。稀土与N—乙酰基—DL—缬氨酸配合物的稳定性呈现明显的“钆断效应”。

In the paper protonation constants of N—Acetyl—DL—Valine and the stability constants of its coordination compounds with rare earths have been determined by potentiometric titration at 25.0±0.1℃ and an the ionic strength of 0.1mol/dm^3(NaClO_4). The results indicate that rare earth elements can form 1: 1 coordination compounds with the ligand. There is an apparent 'gadolinium break' in the system.