All Outputs (40)

Inter- and Intramolecular On-Surface Synthesis of Porphyrin-Based Nanostructures on Au(111) and Cu(111) (2025)
Journal Article
Frampton, E. S., Clarke, M., Edmondson, M., Gray, A., Bradford, J., Warwick, L., Pearce, N., Champness, N. R., & Saywell, A. (2025). Inter- and Intramolecular On-Surface Synthesis of Porphyrin-Based Nanostructures on Au(111) and Cu(111). ACS Applied Nano Materials, 8(24), 12608-12618. https://doi.org/10.1021/acsanm.5c01525

Surface-confined synthesis provides alternative reaction pathways to those utilized within solution-phase chemistry and offers a route to extended molecular architectures with nanoscale dimensions and fascinating magnetic, electronic, and catalytic p... Read More about Inter- and Intramolecular On-Surface Synthesis of Porphyrin-Based Nanostructures on Au(111) and Cu(111).

Asymmetric thiol-modified hybrid polyoxometalates: building blocks for hierarchical nanostructured redox materials (2025)
Journal Article
Newton, G. N., Hampson, E., Kibler, A. J., Cameron, J. M., Watts, J. A., Bellamy-Carter, A., Saywell, A., Johnson, L. R., & Walsh, D. A. (2025). Asymmetric thiol-modified hybrid polyoxometalates: building blocks for hierarchical nanostructured redox materials. Nanoscale, https://doi.org/10.1039/d5nr00544b

The development of hierarchical, redox-active nanostructures can drive new advances in fields ranging from energy storage to sensors and memristors. The self assembly of redox-active molecular building blocks into redox-active structures is especiall... Read More about Asymmetric thiol-modified hybrid polyoxometalates: building blocks for hierarchical nanostructured redox materials.

Experimental Demonstration of a Spectral Fingerprint for the Saddle and Inverted Conformations of Porphyrins on Copper (2025)
Journal Article
S. Frampton, E., Gray, A., Clarke, M., Edmondson, M., Bradford, J., A. Duncan, D., & Saywell, A. (2025). Experimental Demonstration of a Spectral Fingerprint for the Saddle and Inverted Conformations of Porphyrins on Copper. Journal of Physical Chemistry Letters, 16(20), 5012–5017. https://doi.org/10.1021/acs.jpclett.5c00498

Combined density functional theory (DFT) and X-ray standing wave (XSW) studies have previously provided evidence for the preferential adoption of an inverted conformation of 2H-TPP on Cu(111) in contrast to the saddle conformation usually favored by... Read More about Experimental Demonstration of a Spectral Fingerprint for the Saddle and Inverted Conformations of Porphyrins on Copper.

Defect-Induced Doping and Chemisorption of O2 in Se Deficient GaSe Monolayers (2024)
Journal Article
Bradford, J., Rahman, K., Felton, J., Shiffa, M., Cheng, T. S., Beton, P. H., Saywell, A., Greenaway, M., Novikov, S. V., O'Shea, J. N., & Patane, A. (2024). Defect-Induced Doping and Chemisorption of O2 in Se Deficient GaSe Monolayers. 2D Materials, 12(1), Article 015019. https://doi.org/10.1088/2053-1583/ad9d57

Owing to their atomically thin nature, structural defects in two-dimensional materials often play a dominating role in their electronic and optical properties. Here, we grow epitaxial GaSe monolayers on graphene/SiC by molecular beam epitaxy and char... Read More about Defect-Induced Doping and Chemisorption of O2 in Se Deficient GaSe Monolayers.

On-Surface Synthesis of Ni-Porphyrin-Doped Graphene Nanoribbons (2024)
Journal Article
Edmondson, M., Clarke, M., O’Shea, J. N., Chen, Q., Anderson, H. L., & Saywell, A. (2024). On-Surface Synthesis of Ni-Porphyrin-Doped Graphene Nanoribbons. ACS Nano, 18(49), 33390–33397. https://doi.org/10.1021/acsnano.4c09188

On-surface synthesis of functional molecular structures provides a route to the fabrication of materials tailored to exhibit bespoke catalytic, (opto)electronic, and magnetic properties. The fabrication of graphene nanoribbons via on-surface synthesi... Read More about On-Surface Synthesis of Ni-Porphyrin-Doped Graphene Nanoribbons.

Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings (2024)
Journal Article
Van Raden, J. M., Deng, J., Gotfredsen, H., Hergenhahn, J., Clarke, M., Edmondson, M., Hart, J., O'Shea, J. N., Duarte, F., Saywell, A., & Anderson, H. L. (2024). Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings. Angewandte Chemie, 136(14), Article e202400103. https://doi.org/10.1002/ange.202400103

Strained macrocycles display interesting properties, such as conformational rigidity, often resulting in enhanced π-conjugation or enhanced affinity for non-covalent guest binding, yet they can be difficult to synthesize. Here we use computational mo... Read More about Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings.

Porphyrin-fused graphene nanoribbons (2024)
Journal Article
Chen, Q., Lodi, A., Zhang, H., Gee, A., Wang, H. I., Kong, F., Clarke, M., Edmondson, M., Hart, J., O’Shea, J. N., Stawski, W., Baugh, J., Narita, A., Saywell, A., Bonn, M., Müllen, K., Bogani, L., & Anderson, H. L. (2024). Porphyrin-fused graphene nanoribbons. Nature Chemistry, 16, 1133-1140. https://doi.org/10.1038/s41557-024-01477-1

Graphene nanoribbons (GNRs), nanometre-wide strips of graphene, are promising materials for fabricating electronic devices. Many GNRs have been reported, yet no scalable strategies are known for synthesizing GNRs with metal atoms and heteroaromatic u... Read More about Porphyrin-fused graphene nanoribbons.

Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings (2024)
Journal Article
Van Raden, J. M., Deng, J., Gotfredsen, H., Hergenhahn, J., Clarke, M., Edmondson, M., Hart, J., O'Shea, J. N., Duarte, F., Saywell, A., & Anderson, H. L. (2024). Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings. Angewandte Chemie International Edition, Article e202400103. https://doi.org/10.1002/anie.202400103

Strained macrocycles display interesting properties, such as conformational rigidity, often resulting in enhance π‐conjugation or enhanced affinity for non‐covalent guest binding, yet they can be difficult to synthesize. Here we use computational mod... Read More about Template‐Directed Synthesis of Strained meso‐meso‐Linked Porphyrin Nanorings.

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.

Adsorption structure of iron phthalocyanine and titanyl phthalocyanine on Cu(1 1 1) (2023)
Journal Article
Stoodley, M. A., Klein, B. P., Clarke, M., Williams, L. B., Rochford, L. A., Ferrer, P., Grinter, D. C., Saywell, A., & Duncan, D. A. (2023). Adsorption structure of iron phthalocyanine and titanyl phthalocyanine on Cu(1 1 1). Inorganica Chimica Acta, 557, Article 121679. https://doi.org/10.1016/j.ica.2023.121679

The adsorption structure of iron phthalocyanine (FePc) and titanyl phthalocyanine (TiOPc) was studied by a combination of near edge X-ray absorption fine structure (NEXAFS) spectroscopy and normal incidence X-ray standing waves (NIXSW) technique. The... Read More about Adsorption structure of iron phthalocyanine and titanyl phthalocyanine on Cu(1 1 1).

Covalent Template-Directed Synthesis of a Spoked 18-Porphyrin Nanoring** (2023)
Journal Article
Majewski, M. A., Stawski, W., Van Raden, J., Clarke, M., Hart, J., O'Shea, J., Saywell, A., & Anderson, H. L. (2023). Covalent Template-Directed Synthesis of a Spoked 18-Porphyrin Nanoring**. Angewandte Chemie International Edition, Article 202302114. https://doi.org/10.1002/anie.202302114

Rings of porphyrins mimic natural light-harvesting chlorophyll arrays and offer insights into electronic delocalization, providing a motivation for creating larger nanorings with closely spaced porphyrin units. Here, we demonstrate the first synthesi... Read More about Covalent Template-Directed Synthesis of a Spoked 18-Porphyrin Nanoring**.

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., Amabilino, D. B., & Saywell, A. (2023). On-surface polymerisation and self-assembly of DPP-based molecular wires. Molecular Systems Design and Engineering, 8(5), 681-689. 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.

Using polycyclic aromatic hydrocarbons for graphene growth on Cu(111) under ultra-high vacuum (2022)
Journal Article
Klein, B. P., Stoodley, M. A., Edmondson, M., Rochford, L. A., Walker, M., Sattler, L., Weber, S. M., Hilt, G., Williams, L. B. S., Lee, T.-L., Saywell, A., Maurer, R. J., & Duncan, D. A. (2022). Using polycyclic aromatic hydrocarbons for graphene growth on Cu(111) under ultra-high vacuum. Applied Physics Letters, 121(19), Article 191603. https://doi.org/10.1063/5.0122914

Ultra-high vacuum deposition of the polycyclic aromatic hydrocarbons azupyrene and pyrene onto a Cu(111) surface held at a temperature of 1000 K is herein shown to result in the formation of graphene. The presence of graphene was proven using scannin... Read More about Using polycyclic aromatic hydrocarbons for graphene growth on Cu(111) under ultra-high vacuum.

Bending a photonic wire into a ring (2022)
Journal Article
Gotfredsen, H., Deng, J. R., Van Raden, J. M., Righetto, M., Hergenhahn, J., Clarke, M., Bellamy-Carter, A., Hart, J., O’Shea, J., Claridge, T. D., Duarte, F., Saywell, A., Herz, L. M., & Anderson, H. L. (2022). Bending a photonic wire into a ring. Nature Chemistry, 14(12), 1436–1442. https://doi.org/10.1038/s41557-022-01032-w

Natural light-harvesting systems absorb sunlight and transfer its energy to the reaction centre, where it is used for photosynthesis. Synthetic chromophore arrays provide useful models for understanding energy migration in these systems. Research has... Read More about Bending a photonic wire into a ring.

Molecular Diffusion and Self-Assembly: Quantifying the Influence of Substrate hcp and fcc Atomic Stacking (2022)
Journal Article
Edmondson, M., & Saywell, A. (2022). Molecular Diffusion and Self-Assembly: Quantifying the Influence of Substrate hcp and fcc Atomic Stacking. Nano Letters, 22(20), 8210-8215. https://doi.org/10.1021/acs.nanolett.2c02895

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 topography and diffusion link... Read More about Molecular Diffusion and Self-Assembly: Quantifying the Influence of Substrate hcp and fcc Atomic Stacking.

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).

Characterisation and Interpretation of On‐Surface Chemical Reactions Studied by Ultra‐High‐Resolution Scanning Probe Microscopy (2021)
Book Chapter
Sweetman, A., Champness, N. R., & Saywell, A. (2022). Characterisation and Interpretation of On‐Surface Chemical Reactions Studied by Ultra‐High‐Resolution Scanning Probe Microscopy. In N. Champness (Ed.), Supramolecular Chemistry on Surfaces: 2D Networks and 2D Structures (9-42). Wiley. https://doi.org/10.1002/9783527816699.ch2

The investigation of supramolecular self-assembly at surfaces requires detailed characterisation at the molecular or even sub-molecular level. The primary technique that has been employed to ensure a detailed understanding of self-assembled structure... Read More about Characterisation and Interpretation of On‐Surface Chemical Reactions Studied by Ultra‐High‐Resolution Scanning Probe Microscopy.

Self-assembly of a strapped linear porphyrin oligomer on HOPG (2021)
Journal Article
Bellamy-Carter, A., Roche, C., Anderson, H. L., & Saywell, A. (2021). Self-assembly of a strapped linear porphyrin oligomer on HOPG. Scientific Reports, 11, Article 20388. https://doi.org/10.1038/s41598-021-99881-x

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 and catalysis. These... Read More about Self-assembly of a strapped linear porphyrin oligomer on HOPG.

Chemical shielding of H2O and HF encapsulated inside a C60 cage (2021)
Journal Article
Jarvis, S. P., Sang, H., Junqueira, F., Gordon, O., Hodgkinson, J. E. A., Saywell, A., Rahe, P., Mamone, S., Taylor, S., Sweetman, A., Leaf, J., Duncan, D. A., Lee, T. L., Thakur, P. K., Hoffman, G., Whitby, R. J., Levitt, M. H., Held, G., Kantorovich, L., Moriarty, P., & Jones, R. G. (2021). Chemical shielding of H2O and HF encapsulated inside a C60 cage. Communications Chemistry, 4(1), Article 135. https://doi.org/10.1038/s42004-021-00569-0

Molecular surgery provides the opportunity to study relatively large molecules encapsulated within a fullerene cage. Here we determine the location of an H2O molecule isolated within an adsorbed buckminsterfullerene cage, and compare this to the intr... Read More about Chemical shielding of H2O and HF encapsulated inside a C60 cage.

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.