Position and Orientation Control of a Photo- and Electrochromic Dithienylethene Using a Tripodal Anchor on Gold Surfaces
Position and Orientation Control of a Photo- and Electrochromic Dithienylethene Using a Tripodal Anchor on Gold Surfaces
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使用金表面上的三足锚对光致变色和电致变色二噻吩乙烯进行位置和方向控制
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Feringa
中科院分区：
文献类型：
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作者：
T. Pijper;O. Ivashenko;M. Walko;P. Rudolf;W. Browne;B. Feringa
报道了一种三脚架体系，用于将光致变色二噻吩基乙烯类化合物锚定在金表面。采用循环伏安法、表面增强拉曼光谱（Sers）和X射线光电子能谱（XPS）对三脚架功能化二硫烯基乙烯的自组装单分子膜进行了表征。这些数据进行了比较与解决方案的研究，固态拉曼光谱，密度泛函理论（DFT）计算。我们表明，三脚架功能化的二噻吩基乙烯形成稳定的单层金，其中三脚架的所有三个腿被吸附通过硫醇单元，从而提供了一个固定的位置和取向的二噻吩基乙烯部分相对于表面。重要的是，以这种方式固定允许保留二噻吩基乙烯单元的光化学和电化学功能性，并减少在溶液中观察到的光化学疲劳。
A tripodal system for anchoring photochromic dithienylethenes on gold surfaces is reported. The self-assembled monolayers of a tripod-functionalized dithienylethene were characterized by cyclic voltammetry, surface-enhanced Raman spectroscopy (SERS), and X-ray photoelectron spectroscopy (XPS). These data are compared with solution studies, solid state Raman spectroscopy, and density functional theory (DFT) calculations. We show that the tripod-functionalized dithienylethene forms stable monolayers on gold in which all three legs of the tripod are adsorbed via the thiol units, thus providing a fixed position and orientation of the dithienylethene moiety with respect to the surface. Importantly, immobilization in this way allows for retention of both the photochemical and electrochemical functionality of the dithienylethene unit and reduces photochemical fatigue observed in solution.