Self-assembly of a strapped linear porphyrin oligomer on HOPG

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Publication date
2021-11-03Creators
Bellamy-Carter, Abigail
Saywell, Alex
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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 functionalities are based upon the characteristics of the porphyrin monomers, but are also emergent properties of the extended polymer system. Incorporation of these properties within solid-state devices requires transfer of the polymers to a supporting substrate, and may require a high-degree of lateral order. Here we show that highly ordered self-assembled structures can be formed via a simple solution deposition protocol; for a strapped linear porphyrin oligomer adsorbed on a highly oriented pyrolytic graphite (HOPG) substrate. Two distinct molecule-molecule interactions are observed to drive the formation of two molecular phases (‘Interdigitated’ and ‘Bridge-stabilised’) characterised by scanning tunnelling microscopy, providing information on the unit cell dimensions and self-assembled structure. The concentration dependence of these phases is investigated, and we conclude that a bridge-stabilised phase is the thermodynamically stable structure at room temperature.
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Subjects
- Porphyrins
- Oligomers
- Scanning tunneling microscopy
- Self-assembly (Chemistry)
- Scanning tunnelling microscopy (STM), Porphyrins, Self-assembly, structural models
- Physical sciences::Chemistry::Physical chemistry
- Physical sciences::Physics::Chemical physics, Solid-state physics
- Q Science::QD Chemistry::QD450 Physical and theoretical chemistry
Divisions
- University of Nottingham, UK Campus::Faculty of Science::School of Physics and Astronomy
Deposit date
2021-11-03Data type
Scanning tunnelling microscopy (STM) imagesContributors
- Roche, Cécile
- Anderson, Harry L.
Funders
- Engineering & Physical Sciences Research Council
- Other
- European Research Council
- Royal Society
Grant number
- EP/J006939/1
- EP/M0166110/1
- 320969 (ERC)
Data collection method
STM images acquired using a Molecular Imaging (Agilent) PicoSTMResource languages
- en