稀土冠醚配合物的激光拉曼和红外光谱

本文观察了各个硝酸稀土与15-冠-5(1)、18-冠-6(2)生成的配合物的激光拉曼和红外光谱。配位体的C-O-C红外伸缩振动频率向红移,提供了两者发生配位的迹象。轻、重稀土配合物的不同光谱特征主要取决于配合物水合与否的不同空间构型。875cm~(-1)附近峰属于稀土离子与冠氧原子配位后的金属-氧环伸缩振动,它仅存在于轻稀土无水配合物中。     

稀土元素的电分析化学研究 X:钆-茜素红的极谱配合吸附波的研究

In a supporting electrolyte containing 2X10-4M Alizarin Red S, 0.1M NH3-NH4Cl and at pH 9.6, we obtained an adsorptive complex wave of gadolinium-Alizarin Bed S by single-sweep polarography. The peak potential of the derivative wave is -0.69V (S. C. E.). The limit of detection for gadolinium is 6X10-8M. We have determined the composition of the complex which is 1:3 GD-Alizarin Red S and confirmed that the wave is an adsorptive complex wave. The electrode processes may be presented as follows: Gd3+ + 3HL2- + 3NH3 = (GdL3)6- + 3(NH4)^+ (Chemical reaction) (GdL3)6- = (GdL3)ad6- (Surface process) The total electrochemical reaction is (GdL3)ad6- + 6e + 6(NH4)^+ = (Gd(LH2)3)ad6- + 6NH3     

稀土元素的电分析化学研究 VIII.钆与邻苯二酚紫的配合吸附波

In certain supporting electrolytes, pyrocatechol violet (PV) may be reduced at single-sweep polarograph and a well-defined wave can be observed. The height of this wave decreases when Gd3+ is added into the solution and a sharp-peaked new wave is observed at more negative potentials. The height of this new wave is proportional to the concentration of gadolinium added. NH4Cl-(CH2)6N4 mixture (pH 5.5) was chosen as the suitable supporting electrolyte, in which the new wave of the Gd3+-PV complex is higher and the difference of peak potentials between PV and complex is larger. The linear relationship between wave height and concentration of Gd3+ holds in the range of 1X10-6-2X10-5 M. In this system other rare earth elements exhibit similar wave peaks. This wave has been proved to be an adsorptive-complex wave by several experiments.     

稀土化合物晶格熵的估算

考虑到化合物的阳离子质量和摩尔体积对其晶格熵的影响,提出一个估算同构同阴离子稀土化合物晶格熵的公式:S_(298.15)~0=S_(ref)~0 (3/2)n_1R·lnM/M_(ref) (3/2)n_2R·lnV/V_(ref)计算结果能满意地与实验值相吻合.     

稀土(镧、铈)-茜素配位剂双核配合物组成和稳定常数的测定

研究了茜素配位剂与稀土的二元反应,从La(Ce)-茜素的吸收光谱着手,分析讨论了它们的反应机理,并拟定了一个既可区分单核与多核,又可测定稳定常数的方法.     

铕(或其他稀土)-二价金属离子-二甲酚橙配合物吸光度的加和性

本文继Eu-Xo, Zn-Xo配合物加和性研究进而证实铕(或其他稀土), 二甲酚橙(Xo或H6L)和M^2^+-Xo(M^2^+=Mn, Co, Ni, Cu, Zn, Cd, Pb)混合液的吸光度加和性误差<±2%, 只有Cu-Xo的误差略大(<±2.5%), 用市售Xo, 误差也在此范围内。本文从配合物的键合和结构, 探讨产生加和性的依据。     

轻稀土氯化物与2,3,11,12-四苯基-1,4,7,10,13,16-六氧-2,11-十八环二烯配合物的合成及XPS研究

本工作合成了轻稀土氯化物与2,3,11,12-四苯基-1,4,7,10,13,16-六氧-2,11-十八环二烯不饱和冠醚所形成的三种新的轻稀土配合物, 我们着重对这些配合物进行了X射线光电子能谱研究, 得到了组成原子芯能级电子(Ln3d5/2, O 1s, C 1s, Cl 2p)的结合能变化信息。