Dihydroazulene/vinylheptafulvene pairs are known as molecular dipole switches that undergo a ring-opening/-closure reaction by UV irradiation or thermal excitation. Herein, we show that the ring-closure reaction of a single vinylheptafulvene adsorbed on the Au(111) surface can be induced by voltage pulses from the tip of a scanning tunneling microscope. This cyclization is accompanied by the elimination of HCN, as confirmed by simulations. When inducing lateral movements by applying voltage pulses with the STM tip, we observe that the response of the single molecules changes with the ring closing reaction. This behaviour is discussed by comparing the dipole moment and the charge distribution of the open and closed forms on the surface.
Bibliographical noteFunding Information:
This work was funded by the European Union. Views and opinions expressed are however those of the authors only and do not necessarily reflect those of the European Union. Neither the European Union nor the granting authority can be held responsible for them.30 Support by the German Research Foundation (DFG) Project 432345501, and the Collaborative Research Centre (CRC) 1415 “Chemistry of Synthetic Two-Dimensional Materials” (No. 417590517) are gratefully acknowledged. O. G. and D. A. R. thank the Center for Information Services and High Performance Computing (ZIH) at TU Dresden for providing high-performance computing time and data storage resources. Support by the Helmholtz Association through Nanonet Research School Funding (VH-KO-606) is gratefully acknowledged. F. L. thanks the FCI for a Liebig Fellowship. O. G. thanks the German Research Foundation (DFG), project number GU1510/5-1.
© 2022 RSC.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Materials Science(all)