【摘要】 用半微量相平衡方法研究了Yb(ClO4 ) 3 ·3H2 O 18C6 CH3 CN三元体系 (2 5℃ )的溶度和饱和溶液折光率 ,绘制了该体系的溶度图和饱和溶液折光率曲线 .考察了相平衡过程中水的行为 .结果表明 :体系中形成两种化学计量的配合物 :Yb(ClO4 ) 3 ·18C6·3H2 O·2CH3 CN与Yb(ClO4 ) 3 ·2 (18C6 )·3H2 O·2CH3 CN ,前者为固液同成份的配合物 ,后者为固液异成分的配合物 .比较讨论了稀土阳离子、盐的阴离子与温度对形成配合物的影响 .在相平衡结果指导下 ,合成了固态配合物样品 ,用化学分析、红外光谱及热分析研究了配合物的组成和一些物理化学性质 .由DSC得到了配合物若干分解步骤的焓变更多还原

【Abstract】 The solubilities of Yb(ClO 4) 3·3H 2O-18C6-CH 3CN ternary system at 25 ℃ were investigated by a semimicro method of phase equilibrium, and the refractive indexes of saturated solutions were determined. The corresponding solubility diagram and refractive index curve of saturated solutions were constructed. The behavior of water in this system at 25 ℃ during the equilibrium was examined. The results indicate that there are two kinds of complexes formed in the title system at 25 ℃, namely, Yb(ClO 4) 3·18C6·3H 2O·2CH 3CN (I) and Yb(ClO 4) 3·2(18C6)·3H2O·2CH 3CN(Ⅱ), the former is congruently soluble in CH 3CN and the later is incongruently soluble in CH 3CN. The influences of rare earth ions, salt anions and temperature on formation of complexes were discussed. On the basis of the result of phase equilibrium, the solid complexes have been prepared, their chemical compositions and properties have been investigated by chemical analysis. IR. DTG.TG and DSC. According to the DSC, the enthalpies of some steps during the decomposition have been obtained for solid complexes (Ⅲ) and (Ⅳ).更多还原