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Complexes of Crown Ether with the Rare Earth Nitrates(Ⅺ)--Studies on Solubilities of the Ternary System, Y(NO_3)_3·3H_2O-B15C5-C_2H_5OH, at18℃

Ren Dehou, Jiang Haiying, He Mingan, Li Chenglin and Pei Hong (Department of Chemistry, Northwest University, Xi' an)  
The solubilities of the ternary system, Y(NO3)3·3H2O·Bl5C5·C2H5OH, at 18℃ have been investigated by the modified semimicro phase equilibrium method. The results indicated that there are two solubility curves for this ternary system, the long one correspounds to the solid phase of the complex, Y(NO3)3·B15C5·3H2O· 1.5C2H6OH, the short one to solid phase of B15C5. The curve of refractive indices for saturated solutions consists of two branch lines, which correspound with two branch lines of solubility curve. We have not found another complex species having different ratios, Y/crown.The behavior of water for this system in equilibrium has been examined. Theresults are: the molecular ratio,H2O/Y(NO3), no matter whether it is in liquidphase or solid phase, is always 3:1.The complex has been isolated from organic solvent, C2H5OH. The composition and properties of this complex (Y(NO3)3·Bl5C5·3H2O·0.65C2H6OH) have been characterized by chemical analysis, UV-spectrometry, infrared snectrometry and thermogravimctric analysis.
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