Artificial Light–harvesting Systems (LHSs) Based on Boron-difluoride (BF2) Hydrazone Complexes (BODIHYs)

2021 ◽  
Author(s):  
Vishwa Deepak Singh ◽  
Bhupendra Kumar Dwivedi ◽  
Yogesh Kumar ◽  
Shankar Pandey
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
High Energy ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Artificial Light ◽  
Harvesting Systems ◽  
Boron Difluoride ◽  
Hydrazone Ligands ◽  
Hydrazone Complexes

In quest to develop artificial light–harvesting systems (LHSs) with high energy transfer efficiency hydrazone ligands L1–L2 and their –BF2 complexes (BODIHYs; B1 and B2) have been synthesized. Ligands L1, L2...

Polarity-Tuned Energy Transfer Efficiency in Artificial Light-Harvesting Antennae Containing Carbonyl Carotenoids Peridinin and Fucoxanthin

2007 ◽  
Vol 111 (1) ◽  
pp. 467-476 ◽  
Author(s):  
Tomáš Polívka ◽  
Mathias Pellnor ◽  
Eurico Melo ◽  
Torbjörn Pascher ◽  
Villy Sundström ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Artificial Light

Efficient artificial light-harvesting systems based on aggregation-induced emission constructed in supramolecular gels

Soft Matter ◽  
2021 ◽  
Author(s):  
Xinxian Ma ◽  
bo qiao ◽  
Jinlong Yue ◽  
JingJing Yu ◽  
yutao geng ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rhodamine B ◽  
Fluorescent Dyes ◽  
Light Harvesting ◽  
Artificial Light ◽  
Efficient Energy Transfer ◽  
Aggregation Induced Emission ◽  
Efficient Energy ◽  
Harvesting Systems ◽  
Acyl Hydrazone

Based on a new designed acyl hydrazone gelator (G2), we developed an efficient energy transfer supramolecular organogel in glycol with two different hydrophobic fluorescent dyes rhodamine B (RhB) and acridine...

scholarly journals A photosynthetic antenna complex foregoes unity carotenoid-to-bacteriochlorophyll energy transfer efficiency to ensure photoprotection

2020 ◽  
Vol 117 (12) ◽  
pp. 6502-6508 ◽  
Author(s):  
Dariusz M. Niedzwiedzki ◽  
David J. K. Swainsbury ◽  
Daniel P. Canniffe ◽  
C. Neil Hunter ◽  
Andrew Hitchcock
Keyword(s):  
Energy Transfer ◽  
Transient Absorption ◽  
Light Harvesting ◽  
Protein Complexes ◽  
Fluorescence Emission ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Light Harvesting Complexes ◽  
Antenna Complex ◽  
Pigment Protein Complexes

Carotenoids play a number of important roles in photosynthesis, primarily providing light-harvesting and photoprotective energy dissipation functions within pigment–protein complexes. The carbon–carbon double bond (C=C) conjugation length of carotenoids (N), generally between 9 and 15, determines the carotenoid-to-(bacterio)chlorophyll [(B)Chl] energy transfer efficiency. Here we purified and spectroscopically characterized light-harvesting complex 2 (LH2) fromRhodobacter sphaeroidescontaining theN= 7 carotenoid zeta (ζ)-carotene, not previously incorporated within a natural antenna complex. Transient absorption and time-resolved fluorescence show that, relative to the lifetime of the S1state of ζ-carotene in solvent, the lifetime decreases ∼250-fold when ζ-carotene is incorporated within LH2, due to transfer of excitation energy to the B800 and B850 BChlsa. These measurements show that energy transfer proceeds with an efficiency of ∼100%, primarily via the S1→ Qxroute because the S1→ S0fluorescence emission of ζ-carotene overlaps almost perfectly with the Qxabsorption band of the BChls. However, transient absorption measurements performed on microsecond timescales reveal that, unlike the nativeN≥ 9 carotenoids normally utilized in light-harvesting complexes, ζ-carotene does not quench excited triplet states of BChla, likely due to elevation of the ζ-carotene triplet energy state above that of BChla. These findings provide insights into the coevolution of photosynthetic pigments and pigment–protein complexes. We propose that theN≥ 9 carotenoids found in light-harvesting antenna complexes represent a vital compromise that retains an acceptable level of energy transfer from carotenoids to (B)Chls while allowing acquisition of a new, essential function, namely, photoprotective quenching of harmful (B)Chl triplets.

scholarly journals Enhancement of Energy Transfer Efficiency with Structural Control of Multichromophore Light‐Harvesting Assembly

2020 ◽  
Vol 7 (20) ◽  
pp. 2001623
Author(s):  
Inhwan Oh ◽  
Hosoowi Lee ◽  
Tae Wu Kim ◽  
Chang Woo Kim ◽  
Sunhong Jun ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Structural Control ◽  
Light Harvesting ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency

Influence of Phospholipid Composition on Self-Assembly and Energy-Transfer Efficiency in Networks of Light-Harvesting 2 Complexes

2013 ◽  
Vol 117 (36) ◽  
pp. 10395-10404 ◽  
Author(s):  
Ayumi Sumino ◽  
Takehisa Dewa ◽  
Tomoyasu Noji ◽  
Yuki Nakano ◽  
Natsuko Watanabe ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Self Assembly ◽  
Light Harvesting ◽  
Phospholipid Composition ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency

scholarly journals Marine Cyanobacteria Tune Energy Transfer Efficiency in their Light-harvesting Antennae by Modifying Pigment Coupling

2019 ◽  
Author(s):  
Yuval Kolodny ◽  
Hagit Zer ◽  
Mor Propper ◽  
Shira Yochelis ◽  
Yossi Paltiel ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Vertical Mixing ◽  
Photosynthetic Apparatus ◽  
Emission Spectra ◽  
Energy Transfer Efficiency ◽  
Transfer Efficiency ◽  
Transfer Energy ◽  
Harvesting Process

AbstractPhotosynthetic organisms regulate energy transfer to fit to changes in environmental conditions. The biophysical principles underlying the flexibility and efficiency of energy transfer in the light-harvesting process are still not fully understood. Here we examine how energy transfer is regulatedin-vivo. We compare different acclimation states of the photosynthetic apparatus in a marine cyanobacterial species that is well adapted to vertical mixing of the ocean water column and identify a novel acclimation strategy for photosynthetic life under low light intensities. Antennae rods extend, as expected, increasing light absorption. Surprisingly, in contrast to what was known for plants and predicted by classic calculations, these longer rods transfer energy fasteri.e.more efficiently. The fluorescence lifetime and emission spectra dependence on temperature, at the range of 4-300K, suggests that energy transfer efficiency is tuned by modifying the energetic coupling strength between antennae pigments.

scholarly journals Manipulation of supramolecular 2D assembly of functional dyes toward artificial light-harvesting systems

2015 ◽  
Vol 87 (1) ◽  
pp. 3-14 ◽  
Author(s):  
Yohei Ishida
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Purple Bacteria ◽  
Short Review ◽  
Artificial Light ◽  
Effective Utilization ◽  
Host Interactions ◽  
Excellent Research ◽  
Harvesting Systems ◽  
Functional Dyes

AbstractIn recent years, excellent research has revealed that light-harvesting systems (LHSs) are composed of beautifully aligned chlorophyll molecules; the regulated alignment of chlorophylls is responsible for the efficient and selective light-harvesting energy transfer processes in purple bacteria. This finding led to the construction of a regularly arranged assembly of functional dyes as a step toward fabricating artificial LHSs. While most approaches toward the construction of dye assemblies have depended on molecular interactions such as covalent, coordination, and hydrogen bonds, my approach involves guest–host interactions using an inorganic nanosheet as the host material. This short review presents the construction of a 2D dye assembly and its effective utilization in artificial light-harvesting applications. Owing to the highly stable and uniform 2D alignment of functional dyes on inorganic nanosheets, nearly 100 % singlet–singlet energy transfer and efficient light-harvesting were achieved. I believe that the results presented herein will contribute to the construction of efficient photochemical reaction systems in supramolecular host–guest assemblies, which may facilitate the realization of artificial photosynthesis.

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