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STM observation of zinc(II) bridled chiroporphyrin molecules Mitsuru Inada, Shukichi Tanaka, Hitoshi Suzuki, Shinro Mashiko, Lorette Scifo, Zinc bridled chiroporphyrin (ZnBCP-8) molecules on a rutile titanium dioxide (TiO2)(110)|(1 ~ 1) surface were successfully observed by scanning tunneling microscopy (STM) under ultrahigh vacuum conditions. The molecules were selectively adsorbed on the surface apparently due to a molecule|substrate interaction. The origin of the interaction is thought to be Coulomb force between molecule and oxygen vacancy on the TiO2 surface. STM imaging revealed a selective molecular orientation on the TiO2(110)|(1 ~ 1) structure. These results support the possibility of manipulating molecules on the surface and constructing well designed molecular structures by controlling the molecular|substrate and intermolecular interactions. doi:10.1016/j.tsf.2007.04.154 |