Ultrafast energy transfer and excited state coupling in an artificial photosynthetic antenna

M. Maiuri; J. J. Snellenburg; I. H M Van Stokkum; S. Pillai; K. Wongcarter; D. Gust; Thomas Moore; Ana Moore; R. Van Grondelle; G. Cerullo; D. Polli

doi:10.1021/jp401073w

Ultrafast energy transfer and excited state coupling in an artificial photosynthetic antenna

M. Maiuri, J. J. Snellenburg, I. H M Van Stokkum, S. Pillai, K. Wongcarter, D. Gust, Thomas Moore, Ana Moore, R. Van Grondelle, G. Cerullo, D. Polli

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20 Scopus citations

Abstract

We have studied the energy transfer dynamics in an artificial light-harvesting dyad composed of a phthalocyanine (Pc) covalently linked to a carotenoid (Car). The combination of high temporal resolution transient absorption spectroscopy with global and target analysis allowed us to quantify the efficiency of the energy transfer from the S₂ excited state of the Car to the Pc at 37%, close to values observed in some natural light-harvesting complexes. In addition, following selective excitation of the Pc, we have identified the spectral signatures of the S₁ excited state of the Car which appear within the ≈30 fs time resolution of our measurement. This strongly indicates excited state coupling between the S ₁ state of Car and the Q_x state of Pc, with important implications for the regulation of photosynthetic activity.

Original language	English (US)
Pages (from-to)	14183-14190
Number of pages	8
Journal	Journal of Physical Chemistry B
Volume	117
Issue number	46
DOIs	https://doi.org/10.1021/jp401073w
State	Published - Nov 21 2013

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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10.1021/jp401073w

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title = "Ultrafast energy transfer and excited state coupling in an artificial photosynthetic antenna",

abstract = "We have studied the energy transfer dynamics in an artificial light-harvesting dyad composed of a phthalocyanine (Pc) covalently linked to a carotenoid (Car). The combination of high temporal resolution transient absorption spectroscopy with global and target analysis allowed us to quantify the efficiency of the energy transfer from the S2 excited state of the Car to the Pc at 37%, close to values observed in some natural light-harvesting complexes. In addition, following selective excitation of the Pc, we have identified the spectral signatures of the S1 excited state of the Car which appear within the ≈30 fs time resolution of our measurement. This strongly indicates excited state coupling between the S 1 state of Car and the Qx state of Pc, with important implications for the regulation of photosynthetic activity.",

author = "M. Maiuri and Snellenburg, {J. J.} and {Van Stokkum}, {I. H M} and S. Pillai and K. Wongcarter and D. Gust and Thomas Moore and Ana Moore and {Van Grondelle}, R. and G. Cerullo and D. Polli",

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T1 - Ultrafast energy transfer and excited state coupling in an artificial photosynthetic antenna

AU - Maiuri, M.

AU - Snellenburg, J. J.

AU - Van Stokkum, I. H M

AU - Pillai, S.

AU - Wongcarter, K.

AU - Gust, D.

AU - Moore, Thomas

AU - Moore, Ana

AU - Van Grondelle, R.

AU - Cerullo, G.

AU - Polli, D.

PY - 2013/11/21

Y1 - 2013/11/21

N2 - We have studied the energy transfer dynamics in an artificial light-harvesting dyad composed of a phthalocyanine (Pc) covalently linked to a carotenoid (Car). The combination of high temporal resolution transient absorption spectroscopy with global and target analysis allowed us to quantify the efficiency of the energy transfer from the S2 excited state of the Car to the Pc at 37%, close to values observed in some natural light-harvesting complexes. In addition, following selective excitation of the Pc, we have identified the spectral signatures of the S1 excited state of the Car which appear within the ≈30 fs time resolution of our measurement. This strongly indicates excited state coupling between the S 1 state of Car and the Qx state of Pc, with important implications for the regulation of photosynthetic activity.

AB - We have studied the energy transfer dynamics in an artificial light-harvesting dyad composed of a phthalocyanine (Pc) covalently linked to a carotenoid (Car). The combination of high temporal resolution transient absorption spectroscopy with global and target analysis allowed us to quantify the efficiency of the energy transfer from the S2 excited state of the Car to the Pc at 37%, close to values observed in some natural light-harvesting complexes. In addition, following selective excitation of the Pc, we have identified the spectral signatures of the S1 excited state of the Car which appear within the ≈30 fs time resolution of our measurement. This strongly indicates excited state coupling between the S 1 state of Car and the Qx state of Pc, with important implications for the regulation of photosynthetic activity.

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JF - Journal of Physical Chemistry B

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Ultrafast energy transfer and excited state coupling in an artificial photosynthetic antenna

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