Photophysical characteristics of two model antenna systems: a fucoxanthin–pyropheoporbide dyad and its peridinin analogue

Osuka, Atsuhiro; Kume, Takuji; Haggquist, Gregory W.; Jávorfí, Tamás; Lima, João Carlos; Melo, Eurico; Naqvi, K. Razi

doi:10.1016/s0009-2614(99)01098-2

Cited by 19 publications

(25 citation statements)

References 25 publications

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“…Such spectral behavior has been observed in natural antenna systems and in other model systems and is further evidence that the chromophores are tightly coupled; e.g. there is sufficient electronic coupling to mediate energy transfer on the femtosecond time scale (22)(23)(24).…”

Section: Triplet Energy Transfersupporting

confidence: 59%

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

Mariño-Ochoa

Palacios

Kodis

et al. 2002

Photochem Photobiol

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Two carotenoid pigments have been linked as axial ligands to the central silicon atom of a phthalocyanine derivative, forming molecular triad 1. Laser flash studies on the femtosecond and picosecond time scales show that both the carotenoid S1 and S2 excited states act as donor states in 1, resulting in highly efficient singlet energy transfer from the carotenoids to the phthalocyanine. Triplet energy transfer in the opposite direction was also observed. In polar solvents efficient electron transfer from a carotenoid to the phthalocyanine excited singlet state yields a charge-separated state that recombines to the ground state of 1.

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Section: Triplet Energy Transfersupporting

confidence: 59%

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

Mariño-Ochoa

Palacios

Kodis

et al. 2002

Photochem Photobiol

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“…Even though due to the pump scatter it is not possible to obtain the complete spectral shape associated with this dynamics, the observed spectral features point to the formation of the triplet state of fucoxanthin, which is expected to appear in this spectral region (Osuka et al 1999) on the nanosecond timescale after the quenching of chlorophyll triplets formed by intersystem crossing. Notably, this EADS also contains a negative feature in the Chl-a Q y region; this effect, which has also been observed in plant LHCII complexes (Peterman et al 1995), indicates that either the chlorophyll triplets are not fully quenched in this time window, or that there is an interaction between the fucoxanthin triplet and the chlorophylls, causing the chlorophyll to display a spectral response, while the fucoxanthin is in its triplet state.…”

Section: Transient Absorption Dynamics In Fcpmentioning

confidence: 99%

Spectroscopic Characterization of the Excitation Energy Transfer in the Fucoxanthin–Chlorophyll Protein of Diatoms

et al. 2005

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We characterized the energy transfer pathways in the fucoxanthin-chlorophyll protein (FCP) complex of the diatom Cyclotella meneghiniana by conducting ultrafast transient absorption measurements. This light harvesting antenna has a distinct pigment composition and binds chlorophyll a (Chl-a), fucoxanthin and chlorophyll c (Chl-c) molecules in a 4:4:1 ratio. We find that upon excitation of fucoxanthin to its S2 state, a significant amount of excitation energy is transferred rapidly to Chl-a. The ensuing dynamics illustrate the presence of a complex energy transfer network that also involves energy transfer from the unrelaxed or 'hot' intermediates. Chl-c to Chl-a energy transfer occurs on a timescale of a 100 fs. We observe no significant spectral evolution in the Chl-a region of the spectrum. We have applied global and target analysis to model the measured excited state dynamics and estimate the spectra of the states involved; the energy transfer network is discussed in relation to the pigment organization of the FCP complex.

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Section: Discussionmentioning

confidence: 56%

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

Mariño-Ochoa

Palácios

Kodis

et al. 2007

Photochemistry and Photobiology

View full text Add to dashboard Cite

Two carotenoid pigments have been linked as axial ligands to the central silicon atom of a phthalocyanine derivative, forming molecular triad 1. Laser flash studies on the femtosecond and picosecond time scales show that both the carotenoid S1 and S2 excited states act as donor states in 1, resulting in highly efficient singlet energy transfer from the carotenoids to the phthalocyanine. Triplet energy transfer in the opposite direction was also observed. In polar solvents efficient electron transfer from a carotenoid to the phthalocyanine excited singlet state yields a charge‐separated state that recombines to the ground state of 1.

show abstract

Photophysical characteristics of two model antenna systems: a fucoxanthin–pyropheoporbide dyad and its peridinin analogue

Cited by 19 publications

References 25 publications

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

Spectroscopic Characterization of the Excitation Energy Transfer in the Fucoxanthin–Chlorophyll Protein of Diatoms

High-efficiency Energy Transfer from Carotenoids to a Phthalocyanine in an Artificial Photosynthetic Antenna¶

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