title: Ammonia adsorption on iron phthalocyanine on Au(111): influence on adsorbate-substrate coupling and molecular spin.
abstract: The adsorption of ammonia on Au(111)-supported monolayers of iron phthalocyanine has been investigated by x-ray photoelectron spectroscopy, x-ray absorption spectroscopy, and density functional theory calculations. The ammonia-induced changes of the x-ray photoemission lines show that a dative bond is formed between ammonia and the iron center of the phthalocyanine molecules, and that the local spin on the iron atom is quenched. This is confirmed by density functional theory, which also shows that the bond between the iron center of the metalorganic complex and the Au(111) substrate is weakened upon adsorption of ammonia. The experimental results further show that additional adsorption sites exist for ammonia on the iron phthalocyanine monolayer.
authors.affiliation: Division of Synchrotron Radiation Research, Department of Physics, Lund University, Box 118, 221 00 Lund, Sweden.
authors.forename: Cristina
authors.initials: C
authors.lastname: Isvoranu
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.forename: Evren
authors.initials: E
authors.lastname: Ataman
authors.forename: Karina
authors.initials: K
authors.lastname: Schulte
authors.forename: Jan
authors.initials: J
authors.lastname: Knudsen
authors.forename: Jesper N
authors.initials: JN
authors.lastname: Andersen
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Bocquet
authors.forename: Joachim
authors.initials: J
authors.lastname: Schnadt