Light‐Harvesting Supramolecular Polymers: Energy Transfer to Various Polyaromatic Acceptors

A supramolecular light‐harvesting antenna consisting of 3,6‐disubstituted phosphodiester‐linked phenanthrene trimers (donors) was doped with different charged and uncharged polyaromatic and heteroaromatic acceptor chromophores. Excitation of the phenanthrene moieties is followed by energy transfer t...

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Bibliographic Details
Published in:European journal of organic chemistry 2020-08, Vol.2020 (30), p.4677-4680
Main Authors: Jevric, Jovana, Langenegger, Simon M., Häner, Robert
Format: Article
Language:English
Subjects:
Atomic force microscopy
Chromophores
Energy harvesting
Energy transfer
Fluorescence
Light‐harvesting antenna
Phenanthrene
Phosphodiester
Pi interactions
Supramolecular polymers
Trimers
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Summary:A supramolecular light‐harvesting antenna consisting of 3,6‐disubstituted phosphodiester‐linked phenanthrene trimers (donors) was doped with different charged and uncharged polyaromatic and heteroaromatic acceptor chromophores. Excitation of the phenanthrene moieties is followed by energy transfer to the acceptor molecules and radiative relaxation. The self‐assembled fiber structure of the phenanthrene trimers is not altered by the dopant, as verified by atomic force microscopy (AFM). Among several neutral and cationic acceptor chromophores, benzo(a)pyrene emerged as one of the highest fluorescence quantum yields, reaching 31 % at a chromophore/phenanthrene ratio of 12 mol‐%. The energy transfer is probably a combination of Förster resonance energy transfer (FRET) and a coherent energy transfer mechanism. Supramolecular polymers formed from phosphodiester‐bridged phenanthrene trimers are doped with charged and uncharged acceptor chromophores. Excitation of the phenanthrenes is followed by efficient energy transfer to the acceptor molecules.
ISSN:1434-193X
1099-0690
DOI:10.1002/ejoc.202000441