Ion-Transfer Current-Scan Polarographic Studies of Metal Extractants with Ascending Water Electrode: Manganese(H)-1,10-Phenanthroline and Related Ligand Systems
Ion-Transfer Current-Scan Polarographic Studies of Metal Extractants with Ascending Water Electrode: Manganese(H)-1,10-Phenanthroline and Related Ligand Systems
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使用上升水电极进行金属萃取剂的离子转移电流扫描极谱研究：锰(H)-1,10-菲咯啉及相关配体系统
DOI：
10.2116/analsci.7.303
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
H. Freiser
中科院分区：
文献类型：
--
作者：
H. Doe;H. Freiser
Mn^2+离子从菲咯啉衍生物（Phen）的水溶液转移到二氯乙烷（DCE）溶液的机理；使用上升水电极通过电流扫描极谱法研究 1,10-菲咯啉 (phen)、4,7-二甲基-1,10-菲咯啉 (4,7-DMP)、4,7-二苯基-1,10-菲咯啉 (4,7-DPP) 和 2,9-二甲基-1,10-菲咯啉 (2,9-DMP)。转移过程包括 (a) Phen 扩散到水相/DCE 界面，(b) 形成 1:1 Mn^2+-Phen 络合物，其动力学足够慢，足以影响但不能完全控制极谱过程，(c) 1:1 络合物从水相转移到 DCE 相，以及 (d) 该络合物与 DCE 相界面区域的另外两个 Phen 分子进一步反应。步骤(b)的表观反应速率以普通电极反应速率的量纲确定；对于 phen、4,7-DMP 和 4,7-DPP 分别为 8.2×10^-2、5.5×10^-2 和 9.3×10^-3 dm M^-1 s^-1。 Mn^2+-2,9-DMP 复合物的速率太慢而无法确定。
The mechanism of transfer of Mn^2+ ion from an aqueous to a dichloroethane (DCE) solution of a phenanthroline derivative (Phen); 1,10-phenanthroline (phen), 4,7-dimethyl-1,10-phenanthroline (4,7-DMP), 4,7-diphenyl-1,10-phenanthroline (4,7-DPP) and 2,9-dimethyl-1,10-phenanthroline (2,9-DMP), was investigated by current scan polarography with the ascending water electrode. The transfer process involves (a) diffusion of Phen to the aqueous/DCE interface, (b) formation of 1:1 Mn^2+-Phen complex, whose kinetics are sufficiently slow to influence but not entirely control the polarographic process, (c) transfer of the 1:1 complex from the aqueous into the DCE phase and (d) further reaction of this complex with two additional Phen molecules at the interfacial area in DCE phase. The apparent reaction rates of step (b) were determined in the dimension of the ordinary electrode reaction rate; 8.2×10^-2, 5.5×10^-2 and 9.3×10^-3 dm M^-1 s^-1 for phen, 4,7-DMP and 4,7-DPP, respectively. The rate for Mn^2+-2,9-DMP complex was too slow to be determined.