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Issue 40, 2017
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Delocalized triplet state in porphyrin J-aggregates revealed by EPR spectroscopy

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Abstract

In this work, the electronic structure of the triplet state of self-assembled J-aggregates of tetrakis(4-sulfonatophenyl)porphyrin (TPPS) has been characterized by means of time-resolved electron paramagnetic resonance spectroscopy. Several insights into the triplet properties of the aggregate have been gained through comparison with the corresponding monomeric unit in both free base and acidified forms. Molecular distortions in the monomeric acidified TPPS cause variation in its zero-field splitting parameters and a redirection of triplet spin sublevel activity. The aggregation process does not alter the mechanism of triplet state population compared to the acidified monomer but it is accompanied by a further reduction in the zero-field splitting parameter D, which is possibly indicative of the formation of a delocalized triplet state species. The detection of a long-lived spin-polarized radical species also proves polaron generation and movement to a trap site in the J-aggregates.

Graphical abstract: Delocalized triplet state in porphyrin J-aggregates revealed by EPR spectroscopy

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Publication details

The article was received on 05 May 2017, accepted on 17 Sep 2017 and first published on 18 Sep 2017


Article type: Communication
DOI: 10.1039/C7CP02968C
Citation: Phys. Chem. Chem. Phys., 2017,19, 27173-27177
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    Delocalized triplet state in porphyrin J-aggregates revealed by EPR spectroscopy

    L. Bolzonello, M. Albertini, E. Collini and M. Di Valentin, Phys. Chem. Chem. Phys., 2017, 19, 27173
    DOI: 10.1039/C7CP02968C

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