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Self-assembly of a strapped linear porphyrin oligomer on HOPG

Bellamy-Carter, Abigail; Roche, Cécile; Anderson, Harry L; Saywell, Alex

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Authors

Abigail Bellamy-Carter

Cécile Roche

Harry L Anderson



Abstract

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 upon 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 a thermodynamically stable structure at room temperature.

Journal Article Type Article
Acceptance Date Sep 22, 2021
Online Publication Date Oct 14, 2021
Publication Date 2021
Deposit Date Oct 4, 2021
Publicly Available Date Oct 19, 2021
Journal Scientific Reports
Electronic ISSN 2045-2322
Peer Reviewed Peer Reviewed
Volume 11
Article Number 20388
Public URL https://nottingham-repository.worktribe.com/output/6390387

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