What question did this study set out to answer?

To characterize the photoinduced electron transfer dynamics, intermediate radical pair interactions, and subsequent triplet state decay pathways in a carotene-porphyrin-fullerene triad at low temperature.

April 28, 1998Journal of the American Chemical SocietyOpen Access

EPR Investigation of Photoinduced Radical Pair Formation and Decay to a Triplet State in a Carotene−Porphyrin−Fullerene Triad

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Authors

DCDonatella CarboneraUniversity of Padua MVMarilena Di ValentinUniversity of Padua CCCarlo CorvajaUniversity of Pisa

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Implication

Spectroscopic study demonstrates low-temperature radical pair formation and triplet decay in a molecular triad, highlighting mechanisms that mimic natural photosynthetic reaction centers.

Key Points

To characterize the photoinduced electron transfer dynamics, intermediate radical pair interactions, and subsequent triplet state decay pathways in a carotene-porphyrin-fullerene triad at low temperature.
Synthesized a covalent molecular triad composed of a carotenoid polyene, porphyrin, and fullerene derivative (C-P-C60).
Performed time-resolved electron paramagnetic resonance (EPR) spectroscopy at 20 K following pulsed laser excitation.
Modeled and simulated spin-polarized EPR spectra to determine the electron exchange interaction (J) and decay kinetics.
Porphyrin photoexcitation drove sequential electron transfer to produce the final charge-separated state C•+−P−C60•-, which displayed a weak radical pair exchange coupling of J = 1.2 G.
Charge recombination of C•+−P−C60•- yielded a spin-polarized carotenoid triplet (3C−P−C60) in high yield with a time constant of 1.2 μs.
The spin polarization confirmed that the triplet state formed directly via charge recombination of a singlet-derived radical pair before decaying to the ground state.

Cite This Study

Carbonera et al. (1998) studied this question.

synapsesocial.com/papers/6a1fff092065d284090dc592 https://doi.org/10.1021/ja9712074

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Implication

Spectroscopic study demonstrates low-temperature radical pair formation and triplet decay in a molecular triad, highlighting mechanisms that mimic natural photosynthetic reaction centers.

EPR Investigation of Photoinduced Radical Pair Formation and Decay to a Triplet State in a Carotene−Porphyrin−Fullerene Triad

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Cite This Study

EPR Investigation of Photoinduced Radical Pair Formation and Decay to a Triplet State in a Carotene−Porphyrin−Fullerene Triad

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Cite This Study

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