Browsing Public Research Data by Author "Saywell, Alex"
Now showing items 1-9 of 9
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Molecular diffusion and self-assembly: Quantifying the influence of substrate hcp and fcc atomic stacking
Edmondson, Matthew Richard; Saywell, Alex (The University of Nottingham, 2022-10-14)Molecular diffusion is a fundamental process underpinning surface-confined molecular self-assembly and synthesis. Substrate topography influences molecular assembly, alignment, and reactions; with the relationship between ... -
Molecular quantum ring formed from a pi-conjugated macrocycle
Judd, Chris J.; Saywell, Alex (The University of Nottingham, 2020-10-14)The electronic structure of a molecular quantum ring (stacks of 40-unit cyclic porphyrin polymers) is characterised via scanning tunnelling microscopy and scanning tunnelling spectroscopy. Our measurements access the ... -
An on-surface reaction confined within a porous molecular template
Saywell, Alex (The University of Nottingham, 2019-04-25)On-surface reactions based on metal-catalysed Ullmann coupling have been successfully employed to synthesise a wide variety of covalently coupled structures. Substrate chemistry and topology are both known to effect the ... -
On-Surface Synthesis within a Porphyrin Nanoring Template
Judd, Chris J.; Saywell, Alex (The University of Nottingham, 2019-06-28)On-surface synthesis provides a route for the production of 1D and 2D covalently bonded polymeric structures. Such reactions are confined to the surface of a substrate and the catalytic properties of the substrate are often ... -
Order, disorder, and metalation of tetraphenylporphyrin (2H-TPP) on Au(111)
Edmondson, Matthew Richard; Saywell, Alex; Frampton, Eleanor (The University of Nottingham, 2022-05-09)A thermally induced order–disorder transition of tetraphenylporphyrin (2H-TPP) on Au(111) is characterised by scanning probe microscopy and X-ray photoelectron spectroscopy-based techniques. We observed that a transition ... -
Organisation and ordering of 1D porphyrin polymers synthesised by on-surface Glaser coupling
Saywell, Alex (The University of Nottingham, 2016-07-01)One-dimensional polymer chains consisting of π-conjugated porphyrin units are formed via Glaser coupling on a Ag(111) surface. Scanning probe microscopy reveals the covalent structure of the products and their ordering. ... -
Self-assembly of a strapped linear porphyrin oligomer on HOPG
Bellamy-Carter, Abigail; Saywell, Alex (The University of Nottingham, 2021-11-03)Polymeric structures based on porphyrin units exhibit a range of complex properties, such as nanoscale charge transport and quantum interference effects, and have the potential to act as biomimetic materials for light-harvesting ... -
Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction
Judd, Chris J.; Saywell, Alex (The University of Nottingham, 2020-11-03)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 ... -
Ullmann coupling reactions on Ag(111) and Ag(110): substrate influence on the formation of covalently coupled products and intermediate metal-organic structures
Judd, Chris J.; Saywell, Alex (The University of Nottingham, 2017-11-09)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 ...