稀土硝酸盐冠醚配合物(ⅩⅣ)——La(NO_(3))_(3)·4H_(2)O-B_(12)C_(4)-CH_(3)CN三元体系在25℃时溶解度的研究

Complexs of Crown Ether with the Rare Earth Nitrates(XIV)——Studies on Solubilities of the Ternary System La(NO_(3))_(3)·4H_(2)O-B_(12)C_(4)-CH_(3)CN at 25℃

本文研究了La(NO_(3))_(3)·4H_(2)O-B_(12)C_(4)-CH_(3)CN三元体系在25℃时的溶解度,发现有一条覆盖范围较大的溶解度曲线与组成为La(NO_(3))_(3)·B_(12)C_(4)·4H_(2)O的固相相对应。用合成方法制得了配合物La(NO_(3))_(3)·B_(12)C_(4)·2H_(2)O,通过化学分析、气相色谱、分光光度分析研究了配合物的组成;通过红外光谱、紫外光谱、X-射线衍射以及DSC和TG等研究了它的一些物理化学性质。

The solubilities of the ternary system La(NO_(3))_(3).4H_(2)O-B_(12)C_(4)-CH_(3)CN at 25℃have been determined by the semimicro method in order to summarize general information of complexation about rare earth nitrates and crown ether B_(12)C_(4) in organic solvents.The results indicate that there is only one complex La(NO_(3))_(3) B_(12)C_(4)·4H_(2)O formed,the possibility to form any other complcxs species with different stoichiometry has been ruled out.A relatively stable complex species La(NO_(3))_(3)·B_(l2)C_(4)·2H_(2)O was synthesized.its characters were described by chemical analysis,I.R.spectra,U.V.spectra,spcctrophotometry,gas chromatogrpny,X-ray diffraction,themogravimetric and differential thermal analysis.