title: Structural phases of ordered FePc-nanochains self-assembled on Au(110).
abstract: Iron-phthalocyanine molecules deposited on the Au(110) reconstructed channels assemble into one-dimensional molecular chains, whose spatial distribution evolves into different structural phases at increasing molecular density. The plasticity of the Au channels first induces an ordered phase with a 5×5 symmetry, followed by a second long-range ordered structure composed by denser chains with a 5×7 periodicity with respect to the bare Au surface, as observed in the low-energy electron-diffraction (LEED) and grazing incidence X-ray diffraction (GIXRD) patterns. The geometry of the FePc molecular assemblies in the Au nanorails is determined by scanning tunneling microscopy (STM). For the 5×7 phases, the GIXRD analysis identifies a "4-3" rows profile along the [001] direction in the Au surface and an on-top FePc adsorption site, further confirmed by density functional theory (DFT) calculations. The latter also reveals the electronic mixing of the interface states. The chain assembly is driven by the molecule-molecule interaction and the chains interact with the Au nanorails via the central metal atom, while the chain-chain distance in the different structural phases is primarily driven by the plasticity of the Au surface.
authors.affiliation: Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale Aldo Moro 2, I-00185 Roma, Italy.
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Betti
authors.forename: Pierluigi
authors.initials: P
authors.lastname: Gargiani
authors.forename: Carlo
authors.initials: C
authors.lastname: Mariani
authors.forename: Roberto
authors.initials: R
authors.lastname: Biagi
authors.forename: Jun
authors.initials: J
authors.lastname: Fujii
authors.forename: Giorgio
authors.initials: G
authors.lastname: Rossi
authors.forename: Andrea
authors.initials: A
authors.lastname: Resta
authors.forename: Stefano
authors.initials: S
authors.lastname: Fabris
authors.forename: Sara
authors.initials: S
authors.lastname: Fortuna
authors.forename: Xavier
authors.initials: X
authors.lastname: Torrelles
authors.forename: Manvendra
authors.initials: M
authors.lastname: Kumar
authors.forename: Maddalena
authors.initials: M
authors.lastname: Pedio