title: Synthesis, characterization, monolayer assembly and 2D lanthanide coordination of a linear terphenyl-di(propiolonitrile) linker on Ag(111).
abstract: As a continuation of our work employing polyphenylene-dicarbonitrile molecules and in particular the terphenyl derivative 1 (TDCN), we have synthesized a novel ditopic terphenyl-4,4"-di(propiolonitrile) (2) linker for the self-assembly of organic monolayers and metal coordination at interfaces. The structure of the organic linker 2 was confirmed by single crystal X-ray diffraction analysis (XRD). On the densely packed Ag(111) surface, the terphenyl-4,4"-di(propiolonitrile) linkers self-assemble in a regular, molecular chevron arrangement exhibiting a Moiré pattern. After the exposure of the molecular monolayer to a beam of Gd atoms, the propiolonitrile groups get readily involved in metal-ligand coordination interactions. Distinct coordination motifs evolve with coordination numbers varying between three and six for the laterally-bound Gd centers. The linker molecules retain an overall flat adsorption geometry. However, only networks with restricted local order were obtained, in marked contrast to previously employed, simpler polyphenylene-dicarbonitrile 1 linkers.
authors.affiliation: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Svetlana
authors.initials: S
authors.lastname: Klyatskaya
authors.affiliation: Physik Department E20, Technische Universität München, 85748 Garching, Germany.
authors.forename: José I
authors.initials: JI
authors.lastname: Urgel
authors.affiliation: Physik Department E20, Technische Universität München, 85748 Garching, Germany ; IMDEA Nanoscience, 28049, Madrid, Spain.
authors.forename: David
authors.initials: D
authors.lastname: Écija
authors.affiliation: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany ; Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany.
authors.forename: Olaf
authors.initials: O
authors.lastname: Fuhr
authors.affiliation: Physik Department E20, Technische Universität München, 85748 Garching, Germany.
authors.forename: Willi
authors.initials: W
authors.lastname: Auwärter
authors.affiliation: Physik Department E20, Technische Universität München, 85748 Garching, Germany.
authors.forename: Johannes V
authors.initials: JV
authors.lastname: Barth
authors.affiliation: Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany ; Universite de Strasbourg, Institut de Physique et de Chimie des Materiaux de Strasbourg, CNRS UMP 7504, 23 Rue du Loess, 67034 Strasbourg Cedex 2, France.
authors.forename: Mario
authors.initials: M
authors.lastname: Ruben
keywords: UHV-STM; di(propiolonitrile) linker; lanthanides; metal–organic networks; molecular self-assembly; organic monolayers; single crystal X-ray diffraction analysis
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