Bending a photonic wire into a ring.

Autor: Gotfredsen H; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Deng JR; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Van Raden JM; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Righetto M; Department of Physics, University of Oxford, Clarendon Laboratory, Oxford, UK., Hergenhahn J; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Clarke M; School of Physics & Astronomy, University of Nottingham, Nottingham, UK., Bellamy-Carter A; School of Physics & Astronomy, University of Nottingham, Nottingham, UK., Hart J; School of Physics & Astronomy, University of Nottingham, Nottingham, UK., O'Shea J; School of Physics & Astronomy, University of Nottingham, Nottingham, UK., Claridge TDW; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Duarte F; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK., Saywell A; School of Physics & Astronomy, University of Nottingham, Nottingham, UK. alex.saywell@nottingham.ac.uk., Herz LM; Department of Physics, University of Oxford, Clarendon Laboratory, Oxford, UK. laura.herz@physics.ox.ac.uk., Anderson HL; Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK. harry.anderson@chem.ox.ac.uk.
Jazyk: angličtina
Zdroj: Nature chemistry [Nat Chem] 2022 Dec; Vol. 14 (12), pp. 1436-1442. Date of Electronic Publication: 2022 Oct 17.
DOI: 10.1038/s41557-022-01032-w
Abstrakt: 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.
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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