Kubo Tomoya, Ashida Manaki, Otagiri Shiori, Nozue Haruka, Makigaki Souma, Hinoue Teruo
Department of Chemistry, Faculty of Science, Shinshu University.
Anal Sci. 2017;33(12):1407-1413. doi: 10.2116/analsci.33.1407.
We examined photochemical effects by ultraviolet irradiation on facilitated proton transfer at a water/1,2-dichloroethane (W/DCE) interface by ion-transfer voltammetry using a Xe flash lamp. 5,10,15,20-Tetraphenyl-21H,23H-porphine (HTPP) or its metal complex, such as cobalt (Co(II)TPP), zinc (Zn(II)TPP), and nickel (Ni(II)TPP) complexes, was added into the DCE phase as an ionophore for the facilitated proton transfer. After we irradiated the W/DCE interface through the W phase, the voltammetric waves for proton transfer facilitated by HTPP and Co(II)TPP were remarkably enhanced and shifted to the lower potential region, compared to those before irradiation. We confirmed from the pH and argentometric titrations that such enhancements and shifts of the waves were caused by hydrogen chloride (HCl) produced by photodecomposition of DCE. On the other hand, the waves for proton transfer facilitated by Zn(II)TPP and Ni(II)TPP were very small from the beginning, and showed neither enhancement nor any shift upon irradiation.
我们使用氙闪光灯通过离子转移伏安法研究了紫外线照射对水/1,2 - 二氯乙烷（W/DCE）界面上促进质子转移的光化学效应。将5,10,15,20 - 四苯基 - 21H,23H - 卟啉（HTPP）或其金属配合物，如钴（Co(II)TPP）、锌（Zn(II)TPP）和镍（Ni(II)TPP）配合物，作为促进质子转移的离子载体添加到DCE相中。在我们通过水相照射W/DCE界面后，与照射前相比，由HTPP和Co(II)TPP促进的质子转移伏安波显著增强并向低电位区域移动。我们通过pH和银量滴定证实，这些波的增强和移动是由DCE光分解产生的氯化氢（HCl）引起的。另一方面，由Zn(II)TPP和Ni(II)TPP促进的质子转移波从一开始就非常小，并且在照射后既没有增强也没有任何移动。
