稀土硝酸盐冠醚络合物的研究(Ⅴ)——Y(NO_(3))_(3)·3H_(2)O-18C6-丙酮三元体系在18℃时溶解度的研究

COMPLEXES OF CROWN ETHER WITH THE RARE EARTH NITRATES(Ⅴ)

利用半微量相平衡方法,研究了Y(NO_(3))_(3)·3H2O-18C6-丙酮三元体系在18℃时的溶解度。结果表明:该体系溶解度曲线仅有一条,与盐、醚摩尔比为1:1的络合物Y(NO_(3))_(3)·18C6·3H20的固相相对应。该络合物存在的相区很大。未发现其它化学计量比的络合物形成,考查了在平衡过程中水的行为,发现在液相和固相中,水与硝酸钇的摩尔比都是3:1,制得了固态络合物Y(NO_(3))_(3)·18C6·3H_(2)O,用化学分析方法与红外光谱等对该络合物进行了初步考查。

The solubilities of the ternary system,Y(NO_(3))_(3)·3H_(2)O-18C6-CH_(3)COCH_(3),at 18℃have been determined by the semimicro method to study of phase equilibrium.The results indicated that there is only one solubility curve for this ternary system,it correspounds with the solid phase of the complex CY(NO_(3))_(3)·18C6·3H_(2)O].We have not found any other complex species having different ratios,Y(Ⅲ)crown.The behavior of water for this system in equilibrium has been examined.The results are.the mole ratio[H_(3)O/Y(NO_(3))_(3)],no matter whether it is in liquid phase or solid phase,is always 3:1.The relative stable complex,Y(NO_(3))_(3)·18C6·3H_(2)O,at first has been obtained by us.The composition of this complex has been examined by chemical analysis and infrared spectra.