scholarly journals Photoprotection and triplet energy transfer in higher plants: the role of electronic and nuclear fluctuations

2016 ◽  
Vol 18 (16) ◽  
pp. 11288-11296 ◽  
Author(s):  
Lorenzo Cupellini ◽  
Sandro Jurinovich ◽  
Ingrid G. Prandi ◽  
Stefano Caprasecca ◽  
Benedetta Mennucci
Keyword(s):  
Energy Transfer ◽  
Higher Plants ◽  
Excess Energy ◽  
High Light ◽  
Light Conditions ◽  
Triplet Energy ◽  
Photosynthetic Organisms ◽  
Triplet Energy Transfer

Photosynthetic organisms employ several photoprotection strategies to avoid damage due to the excess energy in high light conditions.

Role of contact complexes in singlet-triplet energy transfer

1988 ◽  
Vol 48 (3) ◽  
pp. 318-322 ◽  
Author(s):  
N. Kh. Ibraev ◽  
G. A. Ketsle ◽  
L. V. Levshin ◽  
Yu. A. Soinikov
Keyword(s):  
Energy Transfer ◽  
Triplet Energy ◽  
Triplet Energy Transfer

scholarly journals Triplet–triplet energy transfer in artificial and natural photosynthetic antennas

2017 ◽  
Vol 114 (28) ◽  
pp. E5513-E5521 ◽  
Author(s):  
Junming Ho ◽  
Elizabeth Kish ◽  
Dalvin D. Méndez-Hernández ◽  
Katherine WongCarter ◽  
Smitha Pillai ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Singlet Oxygen ◽  
Density Functional ◽  
Structural Features ◽  
Electronic Coupling ◽  
Triplet Energy ◽  
Paramagnetic Resonance ◽  
Natural Systems ◽  
Photosynthetic Organisms ◽  
Triplet Energy Transfer

In photosynthetic organisms, protection against photooxidative stress due to singlet oxygen is provided by carotenoid molecules, which quench chlorophyll triplet species before they can sensitize singlet oxygen formation. In anoxygenic photosynthetic organisms, in which exposure to oxygen is low, chlorophyll-to-carotenoid triplet–triplet energy transfer (T-TET) is slow, in the tens of nanoseconds range, whereas it is ultrafast in the oxygen-rich chloroplasts of oxygen-evolving photosynthetic organisms. To better understand the structural features and resulting electronic coupling that leads to T-TET dynamics adapted to ambient oxygen activity, we have carried out experimental and theoretical studies of two isomeric carotenoporphyrin molecular dyads having different conformations and therefore different interchromophore electronic interactions. This pair of dyads reproduces the characteristics of fast and slow T-TET, including a resonance Raman-based spectroscopic marker of strong electronic coupling and fast T-TET that has been observed in photosynthesis. As identified by density functional theory (DFT) calculations, the spectroscopic marker associated with fast T-TET is due primarily to a geometrical perturbation of the carotenoid backbone in the triplet state induced by the interchromophore interaction. This is also the case for the natural systems, as demonstrated by the hybrid quantum mechanics/molecular mechanics (QM/MM) simulations of light-harvesting proteins from oxygenic (LHCII) and anoxygenic organisms (LH2). Both DFT and electron paramagnetic resonance (EPR) analyses further indicate that, upon T-TET, the triplet wave function is localized on the carotenoid in both dyads.

On the Role of Microcrystal Formation in Intermolecular Triplet-Triplet Energy Transfer in Rigid Glasses

1983 ◽  
Vol 38 (10) ◽  
pp. 1146-1148
Author(s):  
M. Zander
Keyword(s):  
Energy Transfer ◽  
Transfer System ◽  
Triplet Energy ◽  
True Solution ◽  
Donor And Acceptor ◽  
Triplet Energy Transfer

Abstract The intermolecular triplet-triplet energy transfer system benzophenone (donor)/naphthalene (acceptor) was studied in various rigid glasses at 77 K. It is shown that energy transfer is much more efficient if the donor is present in the form of microcrystals than in the case where both donor and acceptor compound are in true solution.

Role of Structural Changes in the Triplet−Triplet Energy Transfer Process to Oxime Derivatives

2002 ◽  
Vol 106 (29) ◽  
pp. 6702-6709 ◽  
Author(s):  
Jacques Lalevée ◽  
Xavier Allonas ◽  
Frédéric Louërat ◽  
Jean Pierre Fouassier
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Structural Changes ◽  
Energy Transfer Process ◽  
Triplet Energy ◽  
Oxime Derivatives ◽  
Triplet Energy Transfer
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