Ullmann coupling reactions on Ag(111) and Ag(110): substrate influence on the formation of covalently coupled products and intermediate metal-organic structures
Publication Date
November 9, 2017
Creators
Description
On-surface reactions based on Ullmann coupling are known to proceed on coinage-metal substrates (e.g. Au, Ag,
Cu), with the chemistry of the surface strongly influencing the reaction progression. In addition, the topography of
the surface may be expected to affect the local adsorption geometry of the reactants as well as the intermediate
and final structures. Here, we investigate the effect of two different surface facets of silver, Ag(111) and Ag(110)
on the formation of organometallic and covalent structures for Ullmann-type coupling reactions. Deposition of
4,4”-diiodo-m-terphenyl molecules onto either Ag(111) or Ag(110) surfaces leads to the scission of C-I bonds
followed by the formation of organometalic zigzag structures, consisting of molecules connected by coordination
bonds to Ag adatoms. The covalently coupled product is formed by annealing each surface, leading to the removal
of Ag atoms and the formation of covalently bonded zigzag poly(m-phenylene) structures. Comparisons of the
adsorption model of molecules on each surface before and after annealing reveal that on Ag(111), structures
rearrange by rotation and elongation of bonds in order to become commensurate with the surface, whereas for the
Ag(110) surface, the similarity in adsorption geometry of the intermediate and final states means that no rotation is
required.
Associate publ. DOI
Subjects
Subjects (JACS)
Subjects (LC)
Divisions
University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
University of Nottingham, UK Campus::Faculty of Science::School of Chemistry
Data type
Scanning tunnelling microscopy images (STM)
Funders
People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme
Royal Society Wolfson Merit Award
Grant Number
623992-TOPCHEM
EP/K01773X/1
Data collection method
Scanning Tunelling Microscopy (STM): Omicron VT STM/AFM system
Resource languages
English
Publisher
The University of Nottingham
Date Issued
November 9, 2017
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