Studies on Coordinations Reaction between Eu(NO_3)_3 • 3H_2O and Crown Ether 18C6 in Anhydrous Acetonitrile

摘要

The solubility of the ternary system Eu(NO_3)_3 • 3H_2O-18C6-CH_3CN at 30℃ has been studied by means of semimicro phase equilibrium. The results indicate that there is only one stoichiometric complex formed in the ternary system. There are two solubility curves for this ternary system. The long one corresponds to the solid phase of the complex Eu(NO_3)_3 • 18C6 • 3H_3O and the short one to the solid phase of the 18C6. The curve of refractive indexes for the saturated solutions consists of two branch lines, which correspond to the solubility curves. The behavior of water for this system in equilibrium has been examined. The mole ratio. H_2O/Eu(NO_3)_3, whether in liquid phase or in solid phase, is always 3:1. The complex formed in this solvent has been isolated. The composition of this complex has been examined by chemical analysis. The behavior of this complex has also been examined by IR spectra, thermalanalysis and molar conductance.