Photoinduced long-lived charge separation in a tetrathiafulvalene- porphyrin-fullerene triad detected by time-resolved electron paramagnetic resonance

Marilena Di Valentin, Arianna Bisol, Giancarlo Agostini, Paul A. Liddell, Gerdenis Kodis, Ana L Moore, Thomas A Moore, John Devens Gust, Donatella Carbonera

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Photoinduced electron transfer has been observed in a molecular triad, consisting of a porphyrin (P) covalently linked to a tetrathiafulvalene (TTF) and a fullerene derivative (C 60), in the different phases of the liquid crystal E-7 and in a glass of 2-methyltetrahydrofuran (2-MeTHF) by means of time-resolved electron paramagnetic resonance (EPR) spectroscopy. In both solvents, an EPR. signal observed immediately after excitation has been assigned to the radical pair TTF .+P-C 60 .-, based on its magnetic interaction parameters and spin polarization pattern. In the 2-MeTHF glass and the crystalline phase of E-7, the TTF .+-P-C 60 .- state is formed from the TTF- 1P-C 60 singlet state via an initial TTF-P .-C 60 .- charge-separated state. Long-lived charge separation (∼8 μs) for the singlet-born radical pair is observed in the 2-MeTHF glass at cryogenic temperatures. In the nematic phase of E-7, a high degree of ordering in the liquid crystal is achieved by the molecular triad. In this phase, both singlet- and triplet-initiated electron transfer routes are concurrently active. At room temperature in the presence of the external magnetic field, the triplet-born radical pair T(TTF .+-P-C 60 .-) has a lifetime of ∼7 μs, while that of the singlet-born radical pair s(TTF .+-P-C 60 .-) is much shorter (

Original languageEnglish
Pages (from-to)14401-14409
Number of pages9
JournalJournal of Physical Chemistry B
Volume109
Issue number30
DOIs
Publication statusPublished - Aug 4 2005

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Fullerenes
Porphyrins
polarization (charge separation)
porphyrins
fullerenes
Paramagnetic resonance
electron paramagnetic resonance
Glass
Liquid crystals
glass
electron transfer
Spin polarization
Electrons
liquid crystals
Liquid Crystals
Cryogenics
cryogenic temperature
Spectroscopy
Magnetic fields
Crystalline materials

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Photoinduced long-lived charge separation in a tetrathiafulvalene- porphyrin-fullerene triad detected by time-resolved electron paramagnetic resonance. / Valentin, Marilena Di; Bisol, Arianna; Agostini, Giancarlo; Liddell, Paul A.; Kodis, Gerdenis; Moore, Ana L; Moore, Thomas A; Gust, John Devens; Carbonera, Donatella.

In: Journal of Physical Chemistry B, Vol. 109, No. 30, 04.08.2005, p. 14401-14409.

Research output: Contribution to journalArticle

Valentin, Marilena Di ; Bisol, Arianna ; Agostini, Giancarlo ; Liddell, Paul A. ; Kodis, Gerdenis ; Moore, Ana L ; Moore, Thomas A ; Gust, John Devens ; Carbonera, Donatella. / Photoinduced long-lived charge separation in a tetrathiafulvalene- porphyrin-fullerene triad detected by time-resolved electron paramagnetic resonance. In: Journal of Physical Chemistry B. 2005 ; Vol. 109, No. 30. pp. 14401-14409.
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AU - Bisol, Arianna

AU - Agostini, Giancarlo

AU - Liddell, Paul A.

AU - Kodis, Gerdenis

AU - Moore, Ana L

AU - Moore, Thomas A

AU - Gust, John Devens

AU - Carbonera, Donatella

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