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Self-metalation of tetraphenyl porphyrin on Au(111): Structural characterisation via X-ray standing wave analysis (2023)
Journal Article
Frampton, E. S., Edmondson, M., Judd, C. J., Duncan, D. A., Jones, R. G., & Saywell, A. (2023). Self-metalation of tetraphenyl porphyrin on Au(111): Structural characterisation via X-ray standing wave analysis. Inorganica Chimica Acta, 558, Article 121718. https://doi.org/10.1016/j.ica.2023.121718

The study of surface-confined reactions provides a route towards characterising the mechanistic processes which underpin heterogeneous catalysis. On-surface reactions provide alternative pathways to solution phase synthesis, and can be studied by a r... Read More about Self-metalation of tetraphenyl porphyrin on Au(111): Structural characterisation via X-ray standing wave analysis.

On-surface polymerisation and self-assembly of DPP-based molecular wires (2023)
Journal Article
Clarke, M., Bellamy-Carter, A., Malagreca, F., Hart, J., Argent, S. P., O'Shea, J. N., …Saywell, A. (2023). On-surface polymerisation and self-assembly of DPP-based molecular wires. Molecular Systems Design and Engineering, https://doi.org/10.1039/d2me00232a

The incorporation of organic semiconducting materials within solid-state electronic devices provides a potential route to highly efficient photovoltaics, transistors, and light emitting diodes. Key to the realisation of such devices is efficient intr... Read More about On-surface polymerisation and self-assembly of DPP-based molecular wires.

Order, disorder, and metalation of tetraphenylporphyrin (2H-TPP) on Au(111) (2022)
Journal Article
Edmondson, M., Frampton, E. S., Judd, C. J., Champness, N. R., Jones, R. G., & Saywell, A. (2022). Order, disorder, and metalation of tetraphenylporphyrin (2H-TPP) on Au(111). Chemical Communications, 58(42), 6247–6250. https://doi.org/10.1039/d2cc00820c

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 from an ordered close-packed... Read More about Order, disorder, and metalation of tetraphenylporphyrin (2H-TPP) on Au(111).

Molecular Quantum Rings Formed from a π -Conjugated Macrocycle (2020)
Journal Article
Judd, C. J., Nizovtsev, A. S., Plougmann, R., Kondratuk, D. V., Anderson, H. L., Besley, E., & Saywell, A. (2020). Molecular Quantum Rings Formed from a π -Conjugated Macrocycle. Physical Review Letters, 125(20), Article 206803. https://doi.org/10.1103/PhysRevLett.125.206803

The electronic structure of a molecular quantum ring (stacks of 40-unit cyclic porphyrin polymers) is characterized via scanning tunneling microscopy and scanning tunneling spectroscopy. Our measurements access the energetic and spatial distribution... Read More about Molecular Quantum Rings Formed from a π -Conjugated Macrocycle.

Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction (2020)
Journal Article
Judd, C. J., Junqueira, F. L. Q., Haddow, S. L., Champness, N. R., Duncan, D. A., Jones, R. G., & Saywell, A. (2020). Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction. Communications Chemistry, 3(1), Article 166. https://doi.org/10.1038/s42004-020-00402-0

© 2020, The Author(s). 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... Read More about Structural characterisation of molecular conformation and the incorporation of adatoms in an on-surface Ullmann-type reaction.

On-surface chemical reactions characterised by ultra-high resolution scanning probe microscopy (2020)
Journal Article
Sweetman, A., Champness, N. R., & Saywell, A. (2020). On-surface chemical reactions characterised by ultra-high resolution scanning probe microscopy. Chemical Society Reviews, 49(13), 4189-4202. https://doi.org/10.1039/d0cs00166j

In the last decade it has become possible to resolve the geometric structure of organic molecules with intramolecular resolution using high resolution scanning probe microscopy (SPM), and specifically using the subset of SPM known as noncontact atomi... Read More about On-surface chemical reactions characterised by ultra-high resolution scanning probe microscopy.

An On-Surface Reaction Confined within a Porous Molecular Template (2017)
Journal Article
Judd, C. J., Champness, N. R., & Saywell, A. (2018). An On-Surface Reaction Confined within a Porous Molecular Template. Chemistry - A European Journal, 24(1), 56-61. https://doi.org/10.1002/chem.201704693

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 progression of an on-surface r... Read More about An On-Surface Reaction Confined within a Porous Molecular Template.

Ullmann coupling reactions on Ag(111) and Ag(110); substrate influence on the formation of covalently coupled products and intermediate metal-organic structures Metal-Organic Structures (2017)
Journal Article
Judd, C. J., Haddow, S. L., Champness, N. R., & Saywell, A. (in press). Ullmann coupling reactions on Ag(111) and Ag(110); substrate influence on the formation of covalently coupled products and intermediate metal-organic structures Metal-Organic Structures. Scientific Reports, 7(14541), https://doi.org/10.1038/s41598-017-13315-1

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 expe... Read More about Ullmann coupling reactions on Ag(111) and Ag(110); substrate influence on the formation of covalently coupled products and intermediate metal-organic structures Metal-Organic Structures.

Physisorption controls the conformation and density of states of an adsorbed porphyrin (2015)
Journal Article
Jarvis, S. P., Taylor, S., Baran, J. D., Thompson, D., Saywell, A., Mangham, B., …Moriarty, P. (2015). Physisorption controls the conformation and density of states of an adsorbed porphyrin. Journal of Physical Chemistry C, 119(50), 27982-27994. https://doi.org/10.1021/acs.jpcc.5b08350

Conformational changes caused by adsorption can dramatically affect a molecule’s properties. Despite extensive study, however, the exact mechanisms underpinning conformational switching are often unclear. Here we show that the conformation of a proto... Read More about Physisorption controls the conformation and density of states of an adsorbed porphyrin.