稀土气态配合物REAl_3Br_(12)稳定性规律

Systematic Study on Stability of the Rare Earth Vapour Complexes:REAl_3Br_(12)

采用骤冷法对反应REBr3（s）＋（3/2）Al2Br6（g）=REAl3Br12（g）进行研究,实验温度和压力范围分别是600~850 K和0.0077~0.22 MPa,反应平衡时间为6 h。测定它们在不同温度下的稳定常数。结果显示,中稀土的气态配合物稳定常数最大。以气态配合物REAl3Br12的lgKp与Z＋/r作图,可将镧系稀土元素分为La-Eu,Eu-Er和Er-Lu三组,在每一组内,REAl3Br12的稳定常数均呈线性关系。在稀土气态配合物RE-Al3Br12稳定常数与原子序数及离子势（Z＋/r）的变化关系中都存在着钆断现象。REAl3Br12稳定常数的对数值对RE（Ⅲ）的基态角量子数作图,得到四条直线,类似斜W效应。

By quenching method,a study of the vapour complexes reaction REBr3（s）＋（3/2）Al2Br6（g）=REAl3Br12（g）was presented.The scope of temperature and pressure in this experiment were 600~850 K and 0.0077~0.22 MPa,respectively.The reaction balance time was all about 6 h.The stability constants were tested.The research indicated that the lanthanide medium rare earth vapour complexes had the highest stability.The stability constant of REAl3Br12 complexes,when plotted against Z＋/r,lanthanide elements could be divided into three groups-La-Eu,Eu-Er and Er-Lu.In each group,the stability constant of REAl3Br12 changed linearly.It was noticeable that the atomic number and Z＋/r,there was gadolinium break between stability constant of REAl3Br12 complexes and lanthanide.Four inclined W lines were obtained when making a drawing logarithm of stability constant to total angular momentum of lanthanide element REAl3Br12,indicating an inclined W effect.