Control of Electron Transfer through Molecular WireBased on Molecular Dipole Engineering

基于分子偶极工程的分子线电子传递控制

基本信息

批准号：
15350068
负责人：
KIMURA Shunsaku
金额：
$ 8.13万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

1.12-Residue helical peptides were immobilized on gold via N terminal with vertical orientation. STM observation revealed that bright images were identified under bias of -1.3 V, but they disappeared upon applying bias of 1.5 V. The change of the brightness is due to the helix interconversion between 3_<10> helix and a helix, which was induced by interaction of the helical dipole moment with the electric field applied to the helical peptide.2.25-Residue helical peptide with a crown ether unit at C terminal was synthesized, and the monolayer was prepared on aqueous solution of Ph(NO_3)_2. Pb2+ ions formed complex with the crown ether units, and the monolayer was successfully transferred on gold. After treating the membrane with H_2S, 2-dimensional network of PbS was formed. The thickness of the membrane was 2.4Å showing a wide band gap with a semiconductor property.3.18-Residue helical peptides with a ferrocene unit at C terminal were synthesized, and their self-assembled monolayers wer … More e formed on gold. The electron transfer reactions in a long rage were evaluated by chronoamperometry to obtain the transfer rates through helical peptides. The interface between the peptide and gold is considered to be one of the rate-determining steps in the electron transfer reaction.4.16-Residue helical peptides were immobilized on gold with vertical orientation, and the molecular conductance was determined by STS measurements. The I-V curve was analyzed by Simons model, and the attenuation coefficient of the electron transfer was determined to be 0.75Å^<-1>. The helical peptide with a ferrocene unit showed rectification in the I-V curve.5.16-Residue helical peptides with an N-ethyl carbazolyl group at C terminal were synthesized, and their self-assembled monolayers were prepared on gold. The effect of ionization of the C terminal carboxyl group on the electron transfer through the helical peptide was studied. The molecular system demonstrated that the photocurrent was switched by changing the pH of the solution. Less

1.12-残基螺旋肽通过N端以垂直方向固定在金上，STM观察显示在-1.3V偏压下识别出明亮的图像，但在施加1.5V偏压时它们消失。亮度的变化是由于3_<10>螺旋与螺旋之间的螺旋互变，是由螺旋偶极矩与施加到螺旋上的电场相互作用引起的合成了C端带有冠醚单元的2.25-残基螺旋肽，并在Ph(NO_3)_2水溶液上制备单分子层，与冠醚单元形成络合物，并将单分子层成功转移到上。用H_2S处理膜后，形成了PbS的二维网络，膜的厚度为2.4Å，显示出与半导体的宽带隙。 3.18-合成了C端带有二茂铁单元的残基螺旋肽，并在金上形成了自组装单分子层，通过计时电流法评估了长时间的电子转移反应，获得了螺旋的转移速率。肽和金之间的界面被认为是电子转移反应中的速率决定步骤之一。4.16-残基螺旋将肽垂直固定在金上，通过STS测量确定分子电导，通过Simons模型分析I-V曲线，确定电子转移的衰减系数为0.75Å^-1。具有二茂铁单元的肽在 I-V 曲线中显示出校正。5.16-C 末端具有 N-乙基咔唑基的残基螺旋肽是合成了它们，并在金上制备了它们的自组装单层，研究了 C 端羧基的电离对通过螺旋肽的电子转移的影响，证明了光电流可以通过改变溶液的 pH 值来切换。。较少的