【摘要】 用电导法研究了30℃时二甲基甲酰胺、二甲基亚砜溶液中稀土硝酸盐与5,7,7,12,14,14-六甲基-1,4,8,11-四氮杂十四环二烯(4,11)的配位作用,测定了1∶1配合物的稳定常数lgKML及摩尔电导率ΛML.同一配合物在极性较小的二甲基甲酰胺溶液中稳定性较高,摩尔电导率ΛML较小.两种溶剂中,随着稀土离子RE3+半径的减小,配合物的稳定性均在增大,摩尔电导率ΛML在逐渐减小.更多还原

【Abstract】 The coordination reaction of several rare earth nitrates with 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetranitrogen cyclotetradecadiene(7,14) in DMF and DMSO at 30?℃ has been studied by means of conductometric titration.The stability constants lg?KML and molar conductivity ΛML of the 1∶1 coordination compounds were calculated.The stability constants of the same rare earth-L complexes are higher in DMF and the values of molar conductivity ΛML of the complexes are higher in DMSO.The stability of the complex increases and the order of the ΛML values of the complexes is reductive with the decrease of the radii of the rare earth ions in the two solvents.更多还原