LaCl_3·3H_2O－18C6－C_2H_5OH体系（25℃）的相平衡研究及  

Studies on Phase Equilibrium of LaCl￣3 ·3H_2O-18C6-C_2H_5OH System at 25℃ and Synthesis and Characterization of Solid Coordination Compounds

作　　者：李谦定[1] 薛鸿福 任德厚[1] 

机构地区：[1]西安石油学院化工系,西北大学化学系

出　　处：《高等学校化学学报》1995年第8期1172-1176,共5页Chemical Journal of Chinese Universities

摘　　要：采用半微量相平衡方法研究了ＬａＣｌ_３·３Ｈ_２Ｏ－１８Ｃ６－Ｃ_２Ｈ_５ＯＨ三元体系在２５℃时的溶解度，测定了各饱和溶液的折光率。结果表明：该体系在２５℃时形成了３种化学计量的配合物，组成分别为ＬａＣｌ_３·１８Ｃ６·３Ｈ_２Ｏ·２ＬａＣｌ－３·１８Ｃ６·６Ｈ_２Ｏ·Ｃ_２Ｈ_５ＯＨ及３ＬａＣｌ_３·１８Ｃ６·９Ｈ_２Ｏ·Ｃ_２Ｈ_５ＯＨ．考察了相平衡过程中水的行为，结果表明：无论在液相还是在固相中，Ｈ_２Ｏ／ＬａＣｌ_３的摩尔比总是３：１．制备了固态配合物，用ＩＲ、ＤＴＧ、ＴＧ与ＤＳＣ研究了配合物的组成与性质。由ＤＳＣ得到配合物不同分解步骤的焓变．The solubilities of LaCl3·3H2O-18C6-C2H5OH ternary system at 25℃ were investigated by a semimicro method of phase equilibrium study,and the refractive indexes of saturated solutions were determined.The results indicate that there are three kinds of complexes formed in this system,namely,3LaCl3·18C6·9H2O·C2H5OH,2LaCl3·18C6·6H2O·C2H5OH and LaCl3·18C6·3H2O. The behavior of water in this system during the equilibrium was examined and the results show that the mole ratio,H2O/LaCl3,is always 3:1,no matter it is in liquid or solid phase.Three solid complexes were prepared and characterized by IR spectra,DTG,TG and DSC. According to the DSC,the enthalpies of some steps during the decomposition were obtained for these three complexes.

关 键 词：氯化镧 冠醚18C6 配合物 相平衡 

分 类 号：O614.331[理学—无机化学] O642.42[理学—化学]