ligand. The formation of Ln(III) complexes having 1:1 and 1:2 metal–ligand stoichiometry has been inferred from the metal–ligand formation curves and the elemental analysis data. The trend in the stability of the Ln(III) complexes follows the order: Pr < Nd < Gd > Tb < Ho. Thermodynamic parameters (ΔG, ΔH, and ΔS) of both protonation and complexation reactions are negative for all of the systems suggesting
利用电位和光谱技术研究了N '-[1-(1-(2,4-二羟基苯基)亚乙基]异烟酰
肼(DEH)与三价Pr,Nd,Gd,Tb和Ho离子的络合。在恒定氧离子强度I = 0.1 mol·dm –3 KNO 3的
二恶烷水溶液(30%)中,在不同温度(293.15、303.15和313.15)K下进行的电位研究表明,存在两个可电离的质子在
配体中。从
金属-
配体形成曲线和元素分析数据推断出
金属
配体化学计量比为1:1和1:2的Ln(III)配合物的形成。Ln(III)配合物的稳定性趋势遵循以下顺序:Pr Tb