title: Aggregation of C70-Fragment Buckybowls on Surfaces: π-H and π-π Bonding in Bowl Up-Side-Down Ensembles.
abstract: The self-assembly of the C38H14-buckybowl, a fragment bowl of the C70 fullerene, has been studied with scanning tunneling microscopy on the Cu(111) surface. Isolated molecules adsorb bowl opening-up with the center C6 ring parallel to the surface. In extended 2D islands, however, 1/3 of the molecules are oriented such that the bowl opening points down. From a detailed analysis of relative orientation of the molecules, the nature of intermolecular lateral interactions is identified. In densely packed islands, π-π bonding between convex sides of the bowls dominate, while π-H bonding between rim and convex sides plays the important role in small molecular 2D clusters.
authors.affiliation: Empa, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland.
authors.forename: Quirin S
authors.initials: QS
authors.lastname: Stöckl
authors.affiliation: Department of Chemistry, National Cheng Kung University , 70101 Tainan, Taiwan.
authors.forename: Ya-Chu
authors.initials: YC
authors.lastname: Hsieh
authors.affiliation: Empa, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland.
authors.forename: Anaïs
authors.initials: A
authors.lastname: Mairena
authors.affiliation: Department of Chemistry, National Cheng Kung University , 70101 Tainan, Taiwan.
authors.forename: Yao-Ting
authors.initials: YT
authors.lastname: Wu
authors.affiliation: Empa, Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf, Switzerland.|Department of Chemistry, University of Zurich , 8057 Zürich, Switzerland.
authors.forename: Karl-Heinz
authors.initials: KH
authors.lastname: Ernst