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Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction

DOI: 10.1038/s42004-020-00402-0 DOI Help

Authors: Chris J. Judd (The University of Nottingham) , Filipe L. Q. Junqueira (The University of Nottingham) , Sarah L. Haddow (The University of Nottingham) , Neil R. Champness (The University of Nottingham) , David A. Duncan (Diamond Light Source) , Robert G. Jones (The University of Nottingham) , Alex Saywell (The University of Nottingham)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Communications Chemistry , VOL 3

State: Published (Approved)
Published: November 2020
Diamond Proposal Number(s): 18752

Open Access Open Access

Abstract: The on-surface synthesis of covalently bonded materials differs from solution-phase synthesis in several respects. The transition from a three-dimensional reaction volume to quasi-two-dimensional confinement, as is the case for on-surface synthesis, has the potential to facilitate alternative reaction pathways to those available in solution. Ullmann-type reactions, where the surface plays a role in the coupling of aryl-halide functionalised species, has been shown to facilitate extended one- and two-dimensional structures. Here we employ a combination of scanning tunnelling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and X-ray standing wave (XSW) analysis to perform a chemical and structural characterisation of the Ullmann-type coupling of two iodine functionalised species on a Ag(111) surface held under ultra-high vacuum (UHV) conditions. Our results allow characterisation of molecular conformations and adsorption geometries within an on-surface reaction and provide insight into the incorporation of metal adatoms within the intermediate structures of the reaction.

Journal Keywords: Characterization and analytical techniques; Scanning probe microscopy; Surface spectroscopy; Two-dimensional materials

Subject Areas: Materials, Chemistry

Instruments: I09-Surface and Interface Structural Analysis


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