Controlled metalation of self-assembled porphyrin nanoarrays in two dimensions.
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.
Auwärter
Willi
W
Departments of Chemistry and Physics & Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada. auwarter@phas.ubc.ca
Weber-Bargioni
Alexander
A
Brink
Susan
S
Riemann
Andreas
A
Schiffrin
Agustin
A
Ruben
Mario
M
Barth
Johannes V
JV
D008665:Metalloporphyrins / Q000737:chemistry*; D016252:Microscopy, Scanning Tunneling; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*
D008665:Metalloporphyrins