Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction
Judd, Chris J.
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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.
- Heterogeneous catalysis
- Scanning tunneling microscopy
- Molecular structure
- Surface chemistry
- On-surface synthesis, Ullmann-type coupling, scanning tunnelling microscopy (STM), X-ray standing wave (XSW), normal-incidence X-ray standing wave (NIXSW), structural determination, heterogeneous catalysis
- Physical sciences::Chemistry::Physical chemistry
- Physical sciences::Physics::Chemical physics, Solid-state physics
- Q Science::QD Chemistry::QD450 Physical and theoretical chemistry
- University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Data typeScanning tunnelling microscopy (STM) images; X-ray photoelectron spectroscopy (XPS) data; Normal incidence X-ray standing wave (NIXSW) data
- Junqueira, Filipe L. Q.
- Haddow, Sarah L.
- Champness, Neil
- Duncan, David A.
- Jones, Robert G.
- Engineering & Physical Sciences Research Council
- Science & Technology Facilities Council
- Royal Society University Research Fellowship
- 19/07/2018 - 24/07/2018
- 10/10/2018 - 07/12/2018
Data collection methodOmicron STM-1 RT-UHV system; Synchrotron X-ray source (Diamond Light Source)