Acta Phys. -Chim. Sin. ›› 1988, Vol. 4 ›› Issue (02): 216-220.doi: 10.3866/PKU.WHXB19880219

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COMPLEXES OF CROWN ETHER WITH THE RARE EARTH NITRATES——STUDIES ON COORDINATION BEHAVIOR BETWEEN Yb(NO3)3·3H2O AND CROWN ETHER B15C5 IN ABSOLUTE ALCOHOL

Sun Juchang; Ren Dehou; Xue hongfu; Chen Ping;
Yin Cuimei; Liu Ziru   

  1. Department of Chemistry; Northwest University; Xian
    Xian Modern Chemical Institute; Xian
  • Received:1986-09-16 Revised:1987-06-09 Published:1988-04-15
  • Contact: Ren Dehou

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Abstract: The solubilities of the ternary system,Yb(NO_3)_3·3H_2O-B15C5·C_2H_5OH, at 18 ℃ have been investigated by the modified semimicro method for study of phase equilibrium. The results indicated that there are two solubility curves for this ternary system: the long one corresponds to the solid phase of the complex (Yb(NO_3)_3·B15C5·3H_2O·2.5C_2H_5OH), and the short one to the solid phase of B15C5. The curve of refractive indexes for saturated solutions consists of two branches, which correspond with two branches with solubility curve. We have not found other complex species having different ratio, Yb/crown.
The behavior of water for this system in equilibrium has been examined. The results are: the mole ratio, H_2O/Yb(NO_3)_3, no matter whether it is in liquid phase or solid phase, is alwaysl 3:1.
The complex has been isolated from organic solvent, C_2H_5OH. The composition of this complex has been determined by chemical analysis and it is Yb(NO_3)_3·B15C5·3H_2O·0.65C_2H_5OH. The properties of this complex have been investigated by chemical analysis, infrafed spectra, DTG and TG.