STM-induced ring closure of vinylheptafulvene molecular dipole switches on Au(111)

Research output: Contribution to journalResearch articleContributedpeer-review



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.


Original languageEnglish
Pages (from-to)4351-4357
Number of pages7
JournalNanoscale advances
Issue number20
Publication statusPublished - 20 Sept 2022

External IDs

ORCID /0000-0001-9607-8715/work/142252646