title: Chronological change from face-on to edge-on ordering of zinc-tetraphenylporphyrin at the phenyloctane-highly oriented pyrolytic graphite interface.
abstract: The self-assembled structure of alkoxy- and N-alkylcarbamoyl-substituted zinc-tetraphenylporphyrin at the liquid-highly oriented pyrolytic graphite (HOPG) interface was observed by using scanning tunneling microscopy. The alkoxy porphyrin showed a phase transition from face-on to edge-on ordering. The phase transition requires the close-packed structure of alkoxy porphyrin. The chronological change of the ordering was traced to show the existence of several types of Ostwald ripening including two-step phase transition from small edge-on to face-on and then further to edge-on orderings. On the other hand, the N-alkylcarbamoyl porphyrin showed persistent edge-on ordering, and the ordering was analyzed by the Moiré pattern. Although the edge-on ordering is observed only in the nonpolar solvent, the orderings have potential applications in the charge and energy transfer.
authors.affiliation: Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Kyoto 615-8510, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sakano
authors.forename: Jun-ya
authors.initials: JY
authors.lastname: Hasegawa
authors.forename: Kenji
authors.initials: K
authors.lastname: Higashiguchi
authors.forename: Kenji
authors.initials: K
authors.lastname: Matsuda