title: Metal-phthalocyanine ordered layers on Au(110): metal-dependent adsorption energy.
abstract: Iron-phthalocyanine and cobalt-phthalocyanine chains, assembled along the Au(110)-(1×2) reconstructed channels, present a strong interaction with the Au metallic states, via the central metal ion. X-ray photoemission spectroscopy from the metal-2p core-levels and valence band high-resolution ultraviolet photoelectron spectroscopy bring to light signatures of the interaction of the metal-phthalocyanine single-layer with gold. The charge transfer from Au to the molecule causes the emerging of a metal-2p core level component at lower binding energy with respect to that measured in the molecular thin films, while the core-levels associated to the organic macrocycle (C and N 1s) are less influenced by the adsorption, and the macrocycles stabilize the interaction, inducing a strong interface dipole. Temperature Programmed Desorption experiments and photoemission as a function of temperature allow to estimate the adsorption energy for the thin-films, mainly due to the molecule-molecule van der Waals interaction, while the FePc and CoPc single-layers remain adsorbed on the Au surface up to at least 820 K.
authors.affiliation: Dipartimento di Fisica, Università di Roma La "Sapienza," 00185 Roma, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Massimi
authors.affiliation: Dipartimento di Fisica, Università di Roma La "Sapienza," 00185 Roma, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Angelucci
authors.affiliation: Dipartimento di Fisica, Università di Roma La "Sapienza," 00185 Roma, Italy.
authors.forename: Pierluigi
authors.initials: P
authors.lastname: Gargiani
authors.affiliation: Dipartimento di Fisica, Università di Roma La "Sapienza," 00185 Roma, Italy.
authors.forename: Maria Grazia
authors.initials: MG
authors.lastname: Betti
authors.affiliation: IFIS Litoral, CONICET-UNL, Laboratorio de Fisica de Superficies e Interfaces, Güemes 3450, Santa Fe, Argentina.
authors.forename: Silvia
authors.initials: S
authors.lastname: Montoro
authors.affiliation: Dipartimento di Fisica, CNISM, Università di Roma La "Sapienza," 00185 Roma, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Mariani