pH-Controlled switching of photocurrent direction by self-assembled monolayer of helical peptides
pH-Controlled switching of photocurrent direction by self-assembled monolayer of helical peptides
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DOI：
10.1021/ja055624p
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发表时间：
2005-10-26
影响因子：
15
通讯作者：
Kimura, S
中科院分区：
文献类型：
--
作者：
Yasutomi, S;Morita, T;Kimura, S
一种新的分子系统，其中的光电流方向可以通过改变溶液的pH值可逆地切换，制备在金从螺旋肽携带光敏剂和羧基在末端。当光敏剂在pH 10的含有电子供体和受体的水溶液中被光激发时，由于羧酸根阴离子增强了偶极矩，单分子膜产生了阳极光电流，而在pH 3.4时产生了相反的阴极光电流
A novel molecular system, where the photocurrent direction can be reversibly switched by changing the pH of the solution, was prepared on gold from helical peptides carrying a photosensitizer and a carboxyl group at the terminal. Upon photoexcitation of the photosensitizer in an aqueous solution containing an electron donor and acceptor at pH 10, the monolayer generated an anodic photocurrent due to enhancement of the dipole moment by a carboxylate anion, while it generated an opposite cathodic photocurrent at pH 3.4