title: Adsorption geometry, conformation, and electronic structure of 2H-octaethylporphyrin on Ag(111) and Fe metalation in ultra high vacuum.
abstract: Due to the growing interest in the ferromagnetic properties of Fe-octaethylporphyrins (Fe-OEP) for applications in spintronics, methods to produce stable Fe-porphyrins with no Cl atoms are highly demanded. Here, we demonstrate the formation of Fe-OEP layers on Ag(111) single crystal by the ultra high vacuum in situ metalation of the free-base 2H-2,3,7,8,12,13,17,18-octaethylporphyrin (2H-OEP) molecules. The metalation proceeds exactly as in the case of 2H-5,10,15,20-tetraphenylporphyrin (2H-TPP) on the same substrate. An extensive surface characterization by means of X-ray photoemission spectroscopy, valence band photoemission, and NEXAFS with synchrotron radiation light provides information on molecular conformation and electronic structure in the monolayer and multilayer cases. We demonstrate that the presence of the ethyl groups affects the tilt of the adsorbed molecules, the conformation of the macrocycle, and the polarization screening in multilayers, but has only a minor effect in the metalation process with respect to 2H-TPP.
authors: I-LAMP and Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia, Italy.
authors: Patrizia
authors: P
authors: Borghetti
authors: ST-INSTM micro- and nano-carbon lab., Elettra - Sincrotrone Trieste S.C.p.A., s.s.14 Km. 163.5, 34149 Trieste, Italy.
authors: Giovanni
authors: G
authors: Di Santo
authors: ST-INSTM micro- and nano-carbon lab., Elettra - Sincrotrone Trieste S.C.p.A., s.s.14 Km. 163.5, 34149 Trieste, Italy.
authors: Carla
authors: C
authors: Castellarin-Cudia
authors: ST-INSTM micro- and nano-carbon lab., Elettra - Sincrotrone Trieste S.C.p.A., s.s.14 Km. 163.5, 34149 Trieste, Italy.
authors: Mattia
authors: M
authors: Fanetti
authors: I-LAMP and Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia, Italy.
authors: Luigi
authors: L
authors: Sangaletti
authors: Istituto Officina dei Materiali-CNR, Laboratorio TASC, s.s. 14 km 163.5, 34149 Trieste, Italy.
authors: Elena
authors: E
authors: Magnano
authors: Istituto Officina dei Materiali-CNR, Laboratorio TASC, s.s. 14 km 163.5, 34149 Trieste, Italy.
authors: Federica
authors: F
authors: Bondino
authors: ST-INSTM micro- and nano-carbon lab., Elettra - Sincrotrone Trieste S.C.p.A., s.s.14 Km. 163.5, 34149 Trieste, Italy.
authors: Andrea
authors: A
authors: Goldoni