title: Controlled metalation of self-assembled porphyrin nanoarrays in two dimensions.
abstract: We report a bottom-up approach for the fabrication of metallo-porphyrin compounds and nanoarchitectures in two dimensions. Scanning tunneling microscopy and tunneling spectroscopy observations elucidate the interaction of highly regular porphyrin layers self-assembled on a Ag(111) surface with iron monomers supplied by an atomic beam. The Fe is shown to be incorporated selectively in the porphyrin macrocycle whereby the template structure is strictly preserved. The immobilization of the molecular reactants allows the identification of single metalation events in a novel reaction scheme. Because the template layers provide extended arrays of reaction sites, superlattices of coordinatively unsaturated and magnetically active metal centers are obtained. This approach offers novel pathways to realize metallo-porphyrin compounds, low-dimensional metal-organic architectures and patterned surfaces which cannot be achieved by conventional means.
authors.affiliation: Departments of Chemistry and Physics & Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada. auwarter@phas.ubc.ca
authors.forename: Willi
authors.initials: W
authors.lastname: Auwärter
authors.forename: Alexander
authors.initials: A
authors.lastname: Weber-Bargioni
authors.forename: Susan
authors.initials: S
authors.lastname: Brink
authors.forename: Andreas
authors.initials: A
authors.lastname: Riemann
authors.forename: Agustin
authors.initials: A
authors.lastname: Schiffrin
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
authors.forename: Johannes V
authors.initials: JV
authors.lastname: Barth
mesh_terms: D008665:Metalloporphyrins / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*
chemical_list: D008665:Metalloporphyrins