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我们曾用自己设计的半微量相平衡方法研究了La(NO_3)_3·4H_2O-B15C5-CH_3CN三元体系在25℃时的溶解度,发现同生成它的母液处于平衡状态时的固态络合物的组成为La(NO_3)_3·B15C5·4H_2O,在一般条件下的相对稳定形式为La(NO_3)_3B15C5·2H_2O。说明了Cassol和King等人所得无水络合物La(NO_3)_3·B15C5是由于后处理条件不当所引起的。为了弄清楚在雨酮中水合镧盐与冠醚B15C5生成的络合物的组
We have used our own semi-micro-phase equilibrium method to study the solubility of La (NO_3) _3 · 4H_2O-B15C5-CH_3CN ternary system at 25 ℃, and found that when its mother liquor is in equilibrium with the solid complex The composition is La (NO_3) _3 · B15C5 · 4H_2O, under the general conditions of the relatively stable form La (NO_3) _3B15C5 · 2H_2O. It is shown that the anhydrous complex La (NO_3) _3 · B15C5 obtained by Cassol and King et al. Is due to the improper post-processing conditions. In order to clarify the group of complexes of hydrated lanthanum salt with crown ether B15C5 in the ketones