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Bending a photonic wire into a ring

Gotfredsen, Henrik; Deng, Jie Ren; Van Raden, Jeff M.; Righetto, Marcello; Hergenhahn, Janko; Clarke, Michael; Bellamy-Carter, Abigail; Hart, Jack; O’Shea, James; Claridge, Timothy D.W.; Duarte, Fernanda; Saywell, Alex; Herz, Laura M.; Anderson, Harry L.

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Henrik Gotfredsen

Jie Ren Deng

Jeff M. Van Raden

Marcello Righetto

Janko Hergenhahn

Michael Clarke

Abigail Bellamy-Carter

Jack Hart

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Associate Professor and Reader in Physics

Timothy D.W. Claridge

Fernanda Duarte

Laura M. Herz

Harry L. Anderson


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 focused on mimicking rings of chlorophyll molecules found in purple bacteria, known as ‘light-harvesting system 2’. Linear meso–meso linked porphyrin chains mediate rapid energy migration, but until now it has not been possible to bend them into rings. Here we show that oligo-pyridyl templates can be used to bend these rod-like photonic wires to create covalent nanorings that consist of 24 porphyrin units and a single butadiyne link. Their elliptical conformations have been probed by scanning tunnelling microscopy. This system exhibits two excited state energy transfer processes: one from a bound template to the peripheral porphyrins and one, in the template-free ring, from the exciton-coupled porphyrin array to the π-conjugated butadiyne-linked porphyrin dimer segment. [Figure not available: see fulltext.]

Journal Article Type Article
Acceptance Date Jul 27, 2022
Online Publication Date Oct 17, 2022
Publication Date Oct 17, 2022
Deposit Date Oct 24, 2022
Publicly Available Date Apr 18, 2023
Journal Nature Chemistry
Print ISSN 1755-4330
Electronic ISSN 1755-4349
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 14
Issue 12
Pages 1436–1442
Keywords General Chemical Engineering; General Chemistry
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