Reversible photomechanical switching of individual engineered molecules at a metallic surface
Reversible photomechanical switching of individual engineered molecules at a metallic surface
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DOI：
10.1103/physrevlett.99.038301
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发表时间：
2007-07-20
影响因子：
8.6
通讯作者：
Crommie, Michael F.
中科院分区：
文献类型：
--
作者：
Comstock, Matthew J.;Levy, Niv;Crommie, Michael F.
我们已经观察到与金属表面结合的单个有机分子的可逆光诱导机械开关。利用扫描隧道显微镜（STM）对Au（111）上偶氮苯分子的力学结构在反式和顺式之间可逆循环前后的特征进行了成像。偶氮苯分子通过在偶氮苯基环上附着不同数量的叔丁基（TB）配体（“腿”）来增加其表面光化学活性。STM图像显示，增加TB腿的数量将偶氮苯分子从底物上“抬升”，从而通过减少分子-表面偶联来增加分子的光力学活性。
We have observed reversible light-induced mechanical switching for individual organic molecules bound to a metal surface. Scanning tunneling microscopy (STM) was used to image the features of individual azobenzene molecules on Au(111) before and after reversibly cycling their mechanical structure between trans and cis states using light. Azobenzene molecules were engineered to increase their surface photomechanical activity by attaching varying numbers of tert-butyl (TB) ligands ("legs") to the azobenzene phenyl rings. STM images show that increasing the number of TB legs "lifts" the azobenzene molecules from the substrate, thereby increasing molecular photomechanical activity by decreasing molecule-surface coupling.