Reorientation of the Cation Radical of Heptyl Viologen on Mercury in Water/DMSO Mixed Media
详细信息 查看全文
- 作者：Juan Ignacio Millá ; n ; Rafael Rodrí ; guez-Amaro ; Juan José ; Ruiz ; and Luis Camacho
- 刊名：Langmuir
- 出版年：1999
- 出版时间：January 19, 1999
- 年：1999
- 卷：15
- 期：2
- 页码：618 - 623
- 全文大小：99K
- 年卷期：v.15,no.2(January 19, 1999)
- ISSN：1520-5827
文摘
In aqueous mixed media containing DMSO in fractions by volume above 0.50 the cation radical of heptylviologen (HV
+) can be absorbed in two different orientations on a mercury electrode. Thus, the cationradical can take a planar conformation relative to the surface; however, depending on the applied potential,it can reorient itself to adopt a different conformation where the bipyridine group lies normal to or at anangle with the electrode. In this work, the reorientation was found to take place via a two-dimensionalphase transition mechanism. The experimental conditions under which the phenomenon occurs are analyzed.
+) can be absorbed in two different orientations on a mercury electrode. Thus, the cationradical can take a planar conformation relative to the surface; however, depending on the applied potential,it can reorient itself to adopt a different conformation where the bipyridine group lies normal to or at anangle with the electrode. In this work, the reorientation was found to take place via a two-dimensionalphase transition mechanism. The experimental conditions under which the phenomenon occurs are analyzed.