采用半微量相平衡方法研究了GdCl3·3H2O-18C6-C2H5OH三元体系(25℃)的溶解度，测定了各饱和溶液的折光率，考察了相平衡过程中水的行为。绘制了体系的溶解度图与饱和溶液折光率曲线。发现了两种未见文献报道的配合物：3GdCl3·18C6·9H2O·C2H5OH与GdCl3·18C6·3H2O。前者为固液异成分溶解的配合物，后者为固液同成分溶解的配合物。制备了固态配合物，通过化学分析、IR、DTG、TG以及DSC研究了配合物的组成与性质，由DSC得到了配合物若干分解步骤的焓变。用热化学方法求得了固态配合物GdCl3·18C6·3H2O(s)的标准生成焓。
The solubilities of GdCl3·3H2O-18C6-C2H5OH ternary system at 25℃ were investigated by a semimicro method for study of phase equilibrium,and the refractive indexes of saturated solutions were determined.The behavior of water in this system during the equilibrium was examined.The cooresponding solubility diagram and refractive index curve of saturated solutions were constructed.It was found that there are two kinds of complexes formed in the system,namely,3GdCl3·18C6·9H2O·C2H5OH and GdCl3·18C6·3H2O.The complexes are not yet found in literatures.Two solid complexes were prepared and characterized by IR spectra,DTG and DSC,the enthalpies of some steps during the decomposition were obtained,and the standard formation enthalpy of the solid complex GdCl3·18C6·3H2O(s) were obtained by means of a thermochemical cycle suggested in this paper.
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