Surface cis Effect : Influence of an Axial Ligand on Molecular Self-Assembly
Knaak, Thomas (Christian-Albrechts-Universität zu Kiel (Alemanya))
Gopakumar, Thiruvancheril G. (Indian Institute of Technology Kanpur)
Schwager, Bettina (Christian-Albrechts-Universität zu Kiel (Alemanya))
Tuczek, Felix (Christian-Albrechts-Universität zu Kiel (Alemanya))
Robles, Roberto (Institut Català de Nanociència i Nanotecnologia)
Lorente Palacios, Nicolás (Centro de Física de Materiales (Sant Sebastià, País Basc))
Berndt, Richard (Christian-Albrechts-Universität zu Kiel (Alemanya))

Data:	2016
Resum:	Adding ligands to molecules can have drastic and unforeseen consequences in the final products of a reaction. Recently a surface trans effect due to the weakening of a molecule-surface bond was reported. Here, we show a surface cis effect where an axial ligand at adsorbed transition-metal complexes enables lateral bonding among the molecules. In the absence of this ligand, the intermolecular interaction is repulsive and supramolecular patterns are not observed. Fe-tetramethyl-tetraazaannulene on Au(111) was investigated using low-temperature scanning tunneling microscopy and spectroscopy along with density functional theory calculations. At low coverages, the molecules remain isolated. Exposure to CO leads to axial CO bonding and induces reordering into extended clusters of chiral molecular trimers. The changed self-assembly pattern is due to a CO-induced modification of the molecular structure and the corresponding charge transfer between the molecule and the substrate, which in turn changes the lateral intermolecular forces.
Ajuts:	Ministerio de Economía y Competitividad SEV-2013-0295 Ministerio de Economía y Competitividad MAT2015-66888-C3-2-R
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Intermolecular interactions ; Lateral bonding ; Lateral intermolecular forces ; Low-temperature scanning tunneling microscopy ; Molecular self assembly ; Molecule surface ; Self-assembly patterns ; Trans effect
Publicat a:	Journal of the American Chemical Society, Vol. 138, Núm. 24 (June 2016) , p. 7544-7550, ISSN 1520-5126

DOI: 10.1021/jacs.6b03710

Post-print 26 p, 4.4 MB

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