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本文用半微量相平衡方法研究了Ｇｄ（ＮＯ＿３）＿３·３Ｈ＿２Ｏ─１８Ｃ６─ＣＨ＿３ＣＮ三元体系在２０℃的溶解度，并测定了体系在２０℃各饱和溶液的折光率。结果表明，该体系中仅有一种化学计量的配合物生成，溶解度曲线与配合物Ｇｄ（ＮＯ＿３）＿３·１８Ｃ６·３Ｈ＿２Ｏ的固相相对应，该配合物存在的相区较大，排除了其它组成配合物存在的可能性，为在乙腈中合成该配合物合理选择盐、醚比提供了依据。另外，试验考察了相平衡过程中水的行为，分离出了固态配合物，利用化学分析、ＩＲ、ＴＧ、ＤＴＧ研究了该固态配合物的组成和性质。
In this paper, the solubility of Gd (NO_3) _3 · 3H_2O -18C6─CH_3CN ternary system at 20 ℃ was studied by semi-micro phase equilibria method. The refractive index of each system was measured at 20 ℃. The results show that there is only one stoichiometric complex in the system. The solubility curve corresponds to the solid phase of the complex Gd (NO 3) 3 · 18C 6 · 3H 2 O. The complex has a large phase region and excludes other components The possibility of the presence of a complex provided the basis for the rational selection of the salt and ether for the synthesis of the complex in acetonitrile. In addition, the behavior of water during the phase equilibrium was investigated and the solid complexes were isolated. The chemical compositions, IR, TG and DTG were used to study the composition and properties of the solid complexes.