Control of Molecular Rotors by Selection of Anchoring Sites
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- Control of Molecular Rotors by Selection of Anchoring Sites
- Kim, Hyo Won; Han, M.; Shin, Hyung-Joon; Lim, S.; Oh, Y.; Tamada, K.; Hara, M.; Kim, Y.; Kawai, M.; Kuk, Young
- Au(111) surfaces; Azobenzene derivatives; Bonding geometry; Hollow sites; Hopping motions; Long chain molecules; Molecular rotors; Phenyl rings; Rotation centers; Rotational motion; Switch-on; Vibrational modes; Voltage pulse
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW LETTERS, v.106, no.14, pp. -
- We demonstrate a new method to switch on and off the rotational motion of a long-chain molecule by controlling the bonding geometry between the molecule and a substrate. An azobenzene derivative molecule adsorbed on a Au(111) surface is immobile only when its three rotation centers, comprised of two phenyl rings and a nitrogen-nitrogen bond, are located at hollow sites of the Au(111) surface, as observed by scanning tunneling microscopy. Rotational motion can be activated by exciting the vibrational modes and inducing hopping motion away from the immobile site with a voltage pulse.
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