论文部分内容阅读
本文用UV分光光度法研究了Cu(Ⅱ)和5位取代-1,10-邻菲啰啉(5-R-phen)配合物与Ni(Ⅱ)的金属交换反应动力学,实验在25℃、pH2.3—3.5范围内和离子强度为1.0mol·dm_(-3)。条件下进行.结果表明反应对配合物Cu(5-R-phen)~(2+)的浓度呈一级关系,反应通过三条不同的途径进行,这三条途径分别为配合物的离解途径、质子催化离解途径和镍(Ⅱ)亲电缔合途径,反应遵循如下速率方程: r={k_0+k_H[H~+]+k_(Ni)[Ni~(2+)]}[Cu(5-R-phen)~(2+)] 本文根据动力学数据讨论了反应机理,实验结果表明金属交换反应速率随配体碱性减小而增大,配合物Cu(5-R-phen)~(2+)的反应活性和配体5-R-phen的碱性强度之间存在直线自由能关系.
The kinetics of metal exchange reaction between Cu (Ⅱ) and 5-substituted 1,10-phenanthroline (5-R-phen) and Ni (Ⅱ) was studied by UV spectrophotometry. , PH2.3-3.5 and ionic strength of 1.0mol · dm _ (- 3). The results show that the reaction has a first order relationship with the concentration of Cu (5-R-phen) 2+, and the reaction proceeds through three different routes: the dissociation route of the complex, proton The reaction follows the rate equation as follows: r = {k_0 + k_H [H ~ +] + k_ (Ni) [Ni2 +]] The reaction mechanism was discussed based on the kinetic data. The experimental results show that the metal exchange reaction rate increases with the decrease of the basicity of the ligand. The complex Cu (5-R-phen) ~ ( 2+) and the basic intensity of the ligand 5-R-phen there is a linear free energy relationship.