Reversible Photomechanical Switching of Individual Engineered Molecules at a Surface

Details Reversible Photomechanical Switching of Individual Engineered Molecules at a Surface Reversible Photomechanical Switching of Individual Engineered Molecules at a Surface

2006-12-07

arxiv.org/abs/cond-mat/0612201v2

PRL 99, 038301 (2007)

Physics

Condensed Matter

Materials Science

related theoretical paper: cond-mat/0612202

Scientific paper

10.1103/PhysRevLett.99.038301

We have observed reversible light-induced mechanical switching for a single organic molecule bound to a metal surface. Scanning tunneling microscopy (STM) was used to image the features of an individual azobenzene molecule on Au(111) before and after reversibly cycling its mechanical structure between trans and cis states using light. Azobenzene molecules were engineered to increase their surface photomechanical activity by attaching varying numbers of tert-butyl (TB) ligands ("legs") to the azobenzene phenyl rings. STM images show that increasing the number of TB legs "lifts" the azobenzene molecules from the substrate, thereby increasing molecular photomechanical activity by decreasing molecule-surface coupling.

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