title: Reaction of Phthalocyanines with Graphene on Ir(111).
abstract: Iron phthalocyanine (FePc) is adsorbed to graphene on Ir(111) at cryogenic temperature. In addition to mobile FePc with four lobes, imaging and spectroscopy with a scanning tunneling microscope reveal immobile molecules that exhibit fewer lobes. A reversible transformation between four- and three-lobed molecules has been induced by current injection. The data are consistent with chemical bonding of lobes to graphene on Ir, pinning down the graphene area toward Ir. Similar observations are made from NiPc, CoPc, CuPc, and H2Pc. The experimental findings can be explained by ab initio calculations, which suggest that a Diels-Alder-type reaction may be involved with an allyl unit of graphene in the top-fcc moiré registry.
authors.affiliation: †Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.
authors.forename: Simon J
authors.initials: SJ
authors.lastname: Altenburg
authors.affiliation: ‡Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Université de Lyon, F69007 Lyon, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Lattelais
authors.affiliation: ∥School of Chemical, Biological, and Materials Engineering, University of Oklahoma, 100 E. Boyd St., Norman, Oklahoma 73019-1004, United States.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.affiliation: ‡Laboratoire de Chimie, Ecole Normale Supérieure de Lyon, CNRS, Université de Lyon, F69007 Lyon, France.
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Bocquet
authors.affiliation: †Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel, Germany.
authors.forename: Richard
authors.initials: R
authors.lastname: Berndt