Single chlorophyll-a molecules, a vital resource for the sustenance of life on Earth, have been investigated by using scanning tunneling microscope manipulation and spectroscopy on a gold substrate at 4.6 K. Chlorophyll-a binds on Au(111) via its porphyrin unit while the phytyl-chain is elevated from the surface by the support of four CH(3) groups. By injecting tunneling electrons from the scanning tunneling microscope tip, we are able to bend the phytyl-chain, which enables the switching of four molecular conformations in a controlled manner. Statistical analyses and structural calculations reveal that all reversible switching mechanisms are initiated by a single tunneling-electron energy-transfer process, which induces bond rotation within the phytyl-chain.

译文

通过在4.6 K的金基板上使用扫描隧道显微镜操纵和光谱学研究了单个叶绿素-a分子,这是维持地球生命的重要资源。叶绿素a通过其卟啉单元在Au(111) 上结合,而植物链通过四个CH(3) 基团的支持从表面升高。通过从扫描隧道显微镜尖端注入隧道电子,我们能够弯曲phytyl链,从而能够以受控方式切换四个分子构象。统计分析和结构计算表明,所有可逆的切换机制都是由单个隧穿电子能量转移过程启动的,该过程会引起植物链内的键旋转。

+1
+2
100研值 100研值 ¥99课程
检索文献一次
下载文献一次

去下载>

成功解锁2个技能,为你点赞

《SCI写作十大必备语法》
解决你的SCI语法难题!

技能熟练度+1

视频课《玩转文献检索》
让你成为检索达人!

恭喜完成新手挑战

手机微信扫一扫,添加好友领取

免费领《Endnote文献管理工具+教程》

微信扫码, 免费领取

手机登录

获取验证码
登录