The role of the 11Bu− state in carotenoid-to-bacteriochlorophyll singlet-energy transfer in the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum and Rhodopseudomonas acidophila

Rondonuwu, Ferdy S.; Yokoyama, Kyosuke; Fujii, Ritsuko; Koyama, Yasushi; Cogdell, Richard J.; Watanabe, Yasutaka

doi:10.1016/j.cplett.2004.03.089

Cited by 56 publications

(72 citation statements)

References 30 publications

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“…[309] This finding was related to the energy lowering of electronic states in carotenoids leading to a closure of energy-transfer channels to BChl pigments. [309,310] This closed channel might either be the 1B u + (S 2 )-to-Q x [310] or the 2A g À (S 1 )-to-Q y pathway. [309][310][311] In contrast to the Car!…”

Section: Weak Excitations In Excitonic Coupling and Energy Transfermentioning

confidence: 99%

“…[309,310] This closed channel might either be the 1B u + (S 2 )-to-Q x [310] or the 2A g À (S 1 )-to-Q y pathway. [309][310][311] In contrast to the Car! (B)Chl channels from the 1B u + state, the 2A g À -to-Q y pathway cannot be discussed in terms of Fçr-ster theory, since the transition to 2A g À is dipole forbidden.…”

Section: Weak Excitations In Excitonic Coupling and Energy Transfermentioning

confidence: 99%

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Quantum Chemical Description of Absorption Properties and Excited‐State Processes in Photosynthetic Systems

2011

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The theoretical description of the initial steps in photosynthesis has gained increasing importance over the past few years. This is caused by more and more structural data becoming available for light-harvesting complexes and reaction centers which form the basis for atomistic calculations and by the progress made in the development of first-principles methods for excited electronic states of large molecules. In this Review, we discuss the advantages and pitfalls of theoretical methods applicable to photosynthetic pigments. Besides methodological aspects of excited-state electronic-structure methods, studies on chlorophyll-type and carotenoid-like molecules are discussed. We also address the concepts of exciton coupling and excitation-energy transfer (EET) and compare the different theoretical methods for the calculation of EET coupling constants. Applications to photosynthetic light-harvesting complexes and reaction centers based on such models are also analyzed.

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Section: Weak Excitations In Excitonic Coupling and Energy Transfermentioning

confidence: 99%

Section: Weak Excitations In Excitonic Coupling and Energy Transfermentioning

confidence: 99%

Quantum Chemical Description of Absorption Properties and Excited‐State Processes in Photosynthetic Systems

2011

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“…An intermediate state with 1B u − symmetry (named S x ) mediating the S 2 → S 1 IC process has been first postulated theoretically and then experimentally demonstrated. [11][12][13][14][15][16][17][18][19][20] Recently, it has been proposed that when Cars are embedded in the LH2 complexes, S x might play an active role in the EET towards the higher excited state Q x of BChls. 21 Moreover, experimental evidence demonstrated the existence of another intermediate state, named S * , involved in the IC process of the Cars, whose origin and nature are still debated.…”

Section: Introductionmentioning

confidence: 99%

Ultra-broadband 2D electronic spectroscopy of carotenoid-bacteriochlorophyll interactions in the LH1 complex of a purple bacterium

Maiuri

Réhault

Carey

et al. 2015

The Journal of Chemical Physics

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Articles you may be interested inUltra-broadband 2D electronic spectroscopy of carotenoid-bacteriochlorophyll interactions in the LH1 complex of a purple bacterium We investigate the excitation energy transfer (EET) pathways in the photosynthetic light harvesting 1 (LH1) complex of purple bacterium Rhodospirillum rubrum with ultra-broadband two-dimensional electronic spectroscopy (2DES). We employ a 2DES apparatus in the partially collinear geometry, using a passive birefringent interferometer to generate the phase-locked pump pulse pair. This scheme easily lends itself to two-color operation, by coupling a sub-10 fs visible pulse with a sub-15-fs near-infrared pulse. This unique pulse combination allows us to simultaneously track with extremely high temporal resolution both the dynamics of the photoexcited carotenoid spirilloxanthin (Spx) in the visible range and the EET between the Spx and the B890 bacterio-chlorophyll (BChl), whose Q x and Q y transitions peak at 585 and 881 nm, respectively, in the near-infrared. Global analysis of the one-color and two-color 2DES maps unravels different relaxation mechanisms in the LH1 complex: (i) the initial events of the internal conversion process within the Spx, (ii) the parallel EET from the first bright state S 2 of the Spx towards the Q x state of the B890, and (iii) the internal conversion from Q x to Q y within the B890. C 2015 AIP Publishing LLC.[http://dx

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“…The electronic and vibronic structures of photosynthetic pigments have attracted considerable attention. Koyama et al have reported detailed multiple channels of singlet-energy transfer to bacteriochlorophyll as a function of the number of conjugated double bonds of all-trans carotenoids [6,7]. They found that the overall energy transfer from carotenoid to bacteriochlorophyll is very high.…”

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confidence: 95%

Spectrally‐resolved transient grating signals from β‐carotene in benzene solution

Sugisaki

Fujiwara

Nair

et al. 2009

Phys. Status Solidi (c)

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The vibronic coherence of β‐carotene in benzene has been investigated by means of transient grating spectroscopy using sub 20‐fs optical pulses. The coherent oscillations with a period of a few tens of femtoseconds have been clearly observed, which reflect the C‐C and C=C stretching modes and the C‐CH3 rocking mode of the polyene backbone. We found that the signal is very sensitive to the excitation wavelength. Calculations based on a Brownian oscillator model were performed. We show that the experimental results are well explained by properly considering the excitation pulse shapes. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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The role of the 11Bu− state in carotenoid-to-bacteriochlorophyll singlet-energy transfer in the LH2 antenna complexes from Rhodobacter sphaeroides G1C, Rhodobacter sphaeroides 2.4.1, Rhodospirillum molischianum and Rhodopseudomonas acidophila

Cited by 56 publications

References 30 publications

Quantum Chemical Description of Absorption Properties and Excited‐State Processes in Photosynthetic Systems

Quantum Chemical Description of Absorption Properties and Excited‐State Processes in Photosynthetic Systems

Ultra-broadband 2D electronic spectroscopy of carotenoid-bacteriochlorophyll interactions in the LH1 complex of a purple bacterium

Spectrally‐resolved transient grating signals from β‐carotene in benzene solution

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