title: Aggregation and contingent metal/surface reactivity of 1,3,8,10-tetraazaperopyrene (TAPP) on Cu(111).
abstract: The structural chemistry and reactivity of 1,3,8,10-tetraazaperopyrene (TAPP) on Cu(111) under ultra-high-vacuum (UHV) conditions has been studied by a combination of experimental techniques (scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy, XPS) and DFT calculations. Depending on the deposition conditions, TAPP forms three main assemblies, which result from initial submonolayer coverages based on different intermolecular interactions: a close-packed assembly similar to a projection of the bulk structure of TAPP, in which the molecules interact mainly through van der Waals (vDW) forces and weak hydrogen bonds; a porous copper surface coordination network; and covalently linked molecular chains. The Cu substrate is of crucial importance in determining the structures of the aggregates and available reaction channels on the surface, both in the formation of the porous network for which it provides the Cu atoms for surface metal coordination and in the covalent coupling of the TAPP molecules at elevated temperature. Apart from their role in the kinetics of surface transformations, the available metal adatoms may also profoundly influence the thermodynamics of transformations by coordination to the reaction product, as shown in this work for the case of the Cu-decorated covalent poly(TAPP-Cu) chains.
authors.affiliation: NCCR Nanoscale Science and Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland.
authors.forename: Manfred
authors.initials: M
authors.lastname: Matena
authors.forename: Meike
authors.initials: M
authors.lastname: Stöhr
authors.forename: Till
authors.initials: T
authors.lastname: Riehm
authors.forename: Jonas
authors.initials: J
authors.lastname: Björk
authors.forename: Susanne
authors.initials: S
authors.lastname: Martens
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Dyer
authors.forename: Mats
authors.initials: M
authors.lastname: Persson
authors.forename: Jorge
authors.initials: J
authors.lastname: Lobo-Checa
authors.forename: Kathrin
authors.initials: K
authors.lastname: Müller
authors.forename: Mihaela
authors.initials: M
authors.lastname: Enache
authors.forename: Hubert
authors.initials: H
authors.lastname: Wadepohl
authors.forename: Jörg
authors.initials: J
authors.lastname: Zegenhagen
authors.forename: Thomas A
authors.initials: TA
authors.lastname: Jung
authors.forename: Lutz H
authors.initials: LH
authors.lastname: Gade