摘要
采用半微量相平衡方法研究了La(ClO_4)_3·3H_2O-18C6-CH_3CN三元体系在25℃时的溶解度,测定了各饱和液相的折光率。结果表明,该体系在25℃时形成了两种化学计量的配合物,其组成分别为:La(ClO_4)_3·18C6·3H_2O·2CH_3CN和La(ClO_4)_3·2(18C6)·3H_2O·2CH_3CN。考察了相平衡过程中水的行为,结果表明,无论在液相还是在湿固相中,H_2O与La(ClO_4)_3的摩尔比总是3:1。制得了组成为:La(ClO_4)_3·18C6·3H_2O,La(ClO_4)_3·2(18C6)·3H_2O等的配合物。用IR,DIG,TG及电导等研究了配合物的组成和性质。
In this paper the solubilities of the ternary system, La(ClO_4)_3·3H_2O-18C6-CH_3CN, at 25℃ have been investigated by using the semimicro method of phase equilibrium and the refractive indexes of saturated solution have been determined. The results indicated that there were two coordination compounds, La(ClO_4)_3·18C6·3H_2O·2CH_3CN and La(ClO_4)_3·2(18C6)·3H_2O·2CH_3CN formed in this system at 25℃. Behavior of water in this system during equilibrium has been examined and the results show that the mole ratio, H_2O/La(ClO_4)_3, is always 3:1, no matter it is in liquid or solid phase. Two coordination compounds have been isolated, the samples having the composition La(ClO_4)_3·18C6·3H_2O and La(ClO_4)_3·2(18C6)·3H_2O. The composition and characteristics of the coordination compounds have been studied by IR, TG, DTG and conductivity measurements.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
1992年第2期183-189,共7页
Journal of Northwest University（Natural Science Edition）
关键词
高氯酸镧
冠醚
乙腈
稀土
络合物
Lanthamum perchlorate
Crown ether
Coordination compound
Phase equilibrium
Solubility.
