title: Rotational libration of a double-decker porphyrin visualized.
abstract: Scanning tunneling microscopy has revealed the reorientation of one of the macrocyclic rings of the double-decker porphyrin complex [Ce(TPP-Fc)(C(22)OPP)] [TPP-Fc = 5-(4-(4-ferrocenylphenylethynyl)phenyl)-10,15,20-triphenylporphyrin; C(22)OPP = 5,10,15,20-tetrakis(4-docosyloxyphenyl)porphyrin] by 90 degrees between scans when the other ring is fixed on a surface. This libration was evidenced by monitoring the location of the appended ferrocene unit, which functioned as a molecular beacon signaling its position.
authors.affiliation: College of Science and Technology, Nihon University, 1-8-14 Kanda Surugadai, Chiyoda, Tokyo 101-8308, Japan. otsuki@chem.cst.nihon-u.ac.jp
authors.forename: Joe
authors.initials: J
authors.lastname: Otsuki
authors.forename: Yuji
authors.initials: Y
authors.lastname: Komatsu
authors.forename: Daiya
authors.initials: D
authors.lastname: Kobayashi
authors.forename: Masumi
authors.initials: M
authors.lastname: Asakawa
authors.forename: Koji
authors.initials: K
authors.lastname: Miyake