Induction of a photostationary ring-opening/closing state of spiropyran   monolayers on the semi-metallic Bi(110) surface
  Molecular switches on metal surfaces typically show very little photoreactivity. Using scanning tunneling microscopy we show that the ring-opening/-closing switch nitrospiropyran thermally and optically isomerizes to the open merocyanine form on a Bi(110) surface. Irradiation by blue light of a monolayer spiropyran molecules leads to mixed domains of the two isomers. At large illumination intensities a photostationary state is established, indicating the bidirectional ring-opening and closing reaction of these molecules on the bismuth surface. The enhanced photoactivity contrasts with the case of adsorption on other metal surfaces, probably due to the low density of states at the Fermi level of the semi-metallic Bi(110) surface. 
Gunnar Schulze, Katharina J. Franke, Jose Ignacio Pascual
cond-mat.mtrl-sci cond-mat.mes-hall physics.chem-ph