Magnetic field control of electron tunneling pathways in the monolayer of (ferrocenylmethyl)dodecyldimethylammonium bromide on a gold electrode.
Magnetic field control of electron tunneling pathways in the monolayer of (ferrocenylmethyl)dodecyldimethylammonium bromide on a gold electrode.
复制标题
金电极上单层（二茂铁基甲基）十二烷基二甲基溴化铵中电子隧道路径的磁场控制。
DOI：
10.1021/jp076663l
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发表时间：
2008
影响因子：
3.3
通讯作者：
S. Ozeki
中科院分区：
文献类型：
--
作者：
G. Saravanan;S. Ozeki
研究了均匀、稳定的垂直于单分子膜的磁场对十二烷基二甲基溴化铵（FDDA）单分子膜及FDDA和11-巯基十一烷酸（MUA）混合单分子膜中电子隧穿反应的影响。在循环伏安图中，二茂铁基/铁离子氧化还原对的电流和峰-峰分离电位都随着磁场强度的增加而增加。FDDA的电子隧穿反应不依赖于单层的势垒厚度，而是依赖于电子隧穿路径。FDDA和MUA的烃链由于协同磁取向而倾斜角的增加可能会导致电子从穿透键到穿透空间的隧穿路径的改变。随着磁场的增加，路径长度和链间超交换跳变的增加导致峰-峰分离电位和隧穿电流的增加。由于磁场的形式电位的正移归因于促进周围的氧化还原电对的水合作用。
The electron-tunneling reaction in the monolayer of (ferrocenylmethyl)dodecyldimethylammonium bromide (FDDA) and the mixed monolayer of FDDA and 11-mercaptoundecanoic acid (MUA) on gold electrodes was affected by homogeneous, steady magnetic fields perpendicular to the monolayer membrane. Both the current and peak-to-peak separation potential of the ferrocenyl/ferricenium redox couple in cyclic voltammograms increased with increasing magnetic field intensity. The electron tunneling reaction of FDDA depended not on the barrier thickness of the monolayer but on the electron tunneling pathways. The increase in the tilt angle of hydrocarbon chains of FDDA and MUA due to cooperative magnetic orientation may bring about change of the electron tunneling pathway of the through-bond to through-space. With increasing magnetic fields, the increase in the path length and interchain superexchange hops led to an increase in the peak-to-peak separation potential and tunneling current. The positive shift of the formal potential due to magnetic fields is ascribed to promotion of hydration around the redox couple.