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Title: Metal-phthalocyanine ordered layers on Au(110): Metal-dependent adsorption energy

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:
; ; ;  [1] ;  [2] ;  [3]
  1. Dipartimento di Fisica, Università di Roma La “Sapienza,” 00185 Roma (Italy)
  2. IFIS Litoral, CONICET-UNL, Laboratorio de Fisica de Superficies e Interfaces, Güemes 3450, Santa Fe (Argentina)
  3. Dipartimento di Fisica, CNISM, Università di Roma La “Sapienza,” 00185 Roma (Italy)
Publication Date:
OSTI Identifier:
22311391
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 140; Journal Issue: 24; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ADSORPTION; BINDING ENERGY; DESORPTION; GOLD; INTERFACES; IONS; IRON; LAYERS; MOLECULES; PHOTOELECTRON SPECTROSCOPY; PHOTOEMISSION; PHTHALOCYANINES; STRONG INTERACTIONS; SURFACES; TEMPERATURE DEPENDENCE; THIN FILMS; VAN DER WAALS FORCES; X RADIATION