Time-resolved EPR investigation of charge recombination to a triplet state in a carotene-diporphyrin triad

M. Di Valentin, A. Bisol, G. Agostini, Ana L Moore, Thomas A Moore, John Devens Gust, R. E. Palacios, S. L. Gould, D. Carbonera

Research output: Contribution to journalArticle

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Abstract

Photoinduced charge separation and recombination were investigated in a triad consisting of a carotenoid (C), a tetraarylporphyrin (P) and a tris(heptafluoropropyl)porphyrin (P F ), C-P-P F , by means of time-resolved electron paramagnetic resonance. The electron transfer process was studied in a glass of 2-methyltetrahydrofuran at 10K, in the crystalline phase at 150K and in the liquid nematic phase of the uniaxial LC E-7 at 295K, and in the nematic phase of the LC ZLI-1167 at 300K. In all the different media and in the different phases, the molecular triad undergoes two-step photoinduced electron transfer, with the generation of a long-lived charge-separated state (C •+ -P-), and charge recombination to the triplet state, localized in the carotene moiety 3 C-P-P F . Low-temperature charge separation and triplet recombination are common features of both fullerene-based and diporphyrin molecular triads, proving that the large delocalized -electron system of the porphyrin electron acceptor leads to low total reorganization energy and low sensitivity to solvent stabilization of the radical ions in a similar way as for fullerene systems.

Original languageEnglish
Pages (from-to)1595-1607
Number of pages13
JournalMolecular Physics
Volume104
Issue number10-11
DOIs
Publication statusPublished - May 20 2006

Fingerprint

carotene
Carotenoids
polarization (charge separation)
porphyrins
Genetic Recombination
atomic energy levels
fullerenes
Paramagnetic resonance
electron transfer
Electrons
Fullerenes
carotenoids
Porphyrins
electron paramagnetic resonance
liquid phases
electrons
stabilization
glass
sensitivity
Electron Spin Resonance Spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Time-resolved EPR investigation of charge recombination to a triplet state in a carotene-diporphyrin triad. / Di Valentin, M.; Bisol, A.; Agostini, G.; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Palacios, R. E.; Gould, S. L.; Carbonera, D.

In: Molecular Physics, Vol. 104, No. 10-11, 20.05.2006, p. 1595-1607.

Research output: Contribution to journalArticle

Di Valentin, M. ; Bisol, A. ; Agostini, G. ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Palacios, R. E. ; Gould, S. L. ; Carbonera, D. / Time-resolved EPR investigation of charge recombination to a triplet state in a carotene-diporphyrin triad. In: Molecular Physics. 2006 ; Vol. 104, No. 10-11. pp. 1595-1607.
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