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用半微量相平衡法研究了 Y(NO_3)_3-3H_2O-18C_6-CH_3CN 三元体系在25℃的溶解度。溶解度曲线由两支组成:一支极短,与冠醚18C6的固相相对应;较长的一支与络合物Y(NO_3)_3·18C6·3H_2O 的固相相对应。饱和溶液的折光率曲线也由两支组成,与溶解度曲线相对应。在平衡过程的液相和固相中水和硝酸钇的摩尔比皆是3:1。对制得的固态络合物Y(NO_3)-3 18C6-3H_2O进行了化学和红外光谱分析。络合物的差热-热重行为表明,Y(NO_3)_3·18C6·H_2O 在72℃开始脱水,在148℃转变为4:3的络合物。
The solubility of Y (NO_3) _3-3H_2O-18C_6-CH_3CN ternary system at 25 ℃ was studied by semi-micro phase equilibrium method. The solubility curve consisted of two components: one was very short and corresponded to the solid phase of crown ether 18C6; the longer one corresponded to the solid phase of complex Y (NO 3) 3 18C 6 3H 2 O. The saturation curve of the refractive index of the solution also consists of two, corresponding to the solubility curve. The molar ratio of water to yttrium nitrate in both the liquid phase and the solid phase during the equilibration is 3: 1. The obtained solid complex Y (NO 3) -3 18C 6-3H 2 O was analyzed by chemical and infrared spectroscopy. The thermogravimetric-thermogravimetric behavior of the complex showed that Y (NO 3) 3 · 18C 6 · H 2 O started to dehydrate at 72 ℃ and was converted to 4: 3 complex at 148 ℃.