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Supramolecular Motors on Graphite Surface Stabilized by Charge States and Hydrogen Bonds
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsnano.7b04811 Kai Sun 1 , Ji-Yong Luo 1 , Xin Zhang 1 , Zhi-Jian Wu 2 , Ying Wang 2 , Hong-Kuan Yuan 1 , Zu-Hong Xiong 1 , Shao-Chun Li 3 , Qi-Kun Xue 4 , Jun-Zhong Wang 1
ACS Nano ( IF 15.8 ) Pub Date : 2017-09-19 00:00:00 , DOI: 10.1021/acsnano.7b04811 Kai Sun 1 , Ji-Yong Luo 1 , Xin Zhang 1 , Zhi-Jian Wu 2 , Ying Wang 2 , Hong-Kuan Yuan 1 , Zu-Hong Xiong 1 , Shao-Chun Li 3 , Qi-Kun Xue 4 , Jun-Zhong Wang 1
Affiliation
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Molecular motors are nanoscale machines that convert external energies into controlled mechanical movements. In supramolecular motors, the rotator and stator are held together mechanically, and thus the rotation can be essentially barrier free when molecular conformation is negligible. However, nearly all the supramolecular motors appeared in solutions or host–guest complexes. Surface-mounted supramolecular motors have rarely been addressed, even though they are easily manipulated by external fields. Here we report a surface-mounted supramolecular motor assembled by charge states and hydrogen bonds. On a graphite surface, individual ethanol clusters can be charged with a scanning tunneling microscopy tip and then trap the ethanol chains with a permanent dipole moment. Serving as a rotator, the trapped ethanol chains rotate around a charged cluster driven by the inelastic tunneling electrons. Random rotation in clockwise or anticlockwise direction occurs in the chiral molecular chains through chiral flipping. Directional rotation with clockwise chirality can be realized by introducing a chiral branch to the near end of ethanol chains to suppress the chiral flipping with steric hindrance.
中文翻译：
通过电荷态和氢键稳定的石墨表面上的超分子电动机
分子电动机是将外部能量转换成受控的机械运动的纳米级机器。在超分子电动机中，转子和定子机械地保持在一起，因此，当分子构象可忽略时，旋转可以基本上是无障碍的。但是，几乎所有超分子马达都出现在溶液或客体-客体复合物中。尽管表面安装的超分子电动机很容易受到外部电场的操纵，但很少解决。在这里，我们报告由电荷状态和氢键组装的表面安装的超分子电动机。在石墨表面上，可以用扫描隧道显微镜尖端给单个乙醇簇充电，然后用永久偶极矩捕获乙醇链。担当旋转器 被捕获的乙醇链绕着由非弹性隧穿电子驱动的带电簇旋转。通过手性翻转在手性分子链中发生顺时针或逆时针方向的随机旋转。通过向乙醇链的近端引入手性支链以抑制具有空间位阻的手性翻转，可以实现具有顺时针手性的方向旋转。
更新日期：2017-09-19
中文翻译：
通过电荷态和氢键稳定的石墨表面上的超分子电动机
分子电动机是将外部能量转换成受控的机械运动的纳米级机器。在超分子电动机中，转子和定子机械地保持在一起，因此，当分子构象可忽略时，旋转可以基本上是无障碍的。但是，几乎所有超分子马达都出现在溶液或客体-客体复合物中。尽管表面安装的超分子电动机很容易受到外部电场的操纵，但很少解决。在这里，我们报告由电荷状态和氢键组装的表面安装的超分子电动机。在石墨表面上，可以用扫描隧道显微镜尖端给单个乙醇簇充电，然后用永久偶极矩捕获乙醇链。担当旋转器 被捕获的乙醇链绕着由非弹性隧穿电子驱动的带电簇旋转。通过手性翻转在手性分子链中发生顺时针或逆时针方向的随机旋转。通过向乙醇链的近端引入手性支链以抑制具有空间位阻的手性翻转，可以实现具有顺时针手性的方向旋转。
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