Light-Harvesting Energy Transfer and Subsequent Electron Transfer of Cationic Porphyrin Complexes on Clay Surfaces

Langmuir ◽  
2006 ◽  
Vol 22 (4) ◽  
pp. 1406-1408 ◽  
Author(s):  
Shinsuke Takagi ◽  
Miharu Eguchi ◽  
Donald A. Tryk ◽  
Haruo Inoue
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Light Harvesting ◽  
Cationic Porphyrin

Through space singlet energy transfers in light-harvesting systems and cofacial bisporphyrin dyads

2010 ◽  
Vol 14 (01) ◽  
pp. 55-63 ◽  
Author(s):  
Pierre D. Harvey ◽  
Christine Stern ◽  
Claude P. Gros ◽  
Roger Guilard
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Time Scale ◽  
Light Harvesting ◽  
Energy Migration ◽  
Triplet Energy ◽  
Energy Transfers ◽  
Harvesting Systems ◽  
Controlled Structure ◽  
And Migration

Recent discoveries from our research groups on the photophysics of a few cofacial bisporphyrin dyads for through space singlet and triplet energy transfers raised several important investigations about the mechanism of energy transfers and energy migration in light-harvesting devices, notably LH II, in the heavily investigated purple photosynthetic bacteria. The key feature is that for face-to-face and slipped dyads with controlled structure using rigid spacers or spacers with limited flexibilities, our fastest rates for singlet energy transfer are in the 10 × 109 s -1 (i.e. 100 ps time scale) for donor-acceptor distances of ~3.5–3.6 Å. The time scale for energy transfers between different bacteriochlorophylls, notably B800*→B850, is in the ps despite the long Mg ⋯ Mg separation (~18 Å). This short rate drastically contrasts with the well-accepted Förster theory. This review focuses on the photophysical processes and dynamics in LH II and compares these parameters with our investigated model dyads build upon octa-etio-porphyrin chromophores and rigid and semi-rigid spacers. The recently discovered role of the rhodopin glucoside (carotenoid) will be analyzed as possible relay for energy transfers, including the possibility of uphill processes at room temperature. In this context the concept of energy migration may be complemented by parallel relays and uphill processes. It is also becoming more obvious that the irreversible electron transfer at the reaction center (electron transfer from the special pair to the phaeophytin) renders the rates for energy transfer and migration faster precluding all possibility of back transfers.

Energy-transfer versus electron-transfer reactions for the light-harvesting phthalocyanine/ dithiolato-bisimino zinc system

2020 ◽  
Vol 73 (4) ◽  
pp. 622-633
Author(s):  
Eman Soliman ◽  
Mohamed EL-Khouly ◽  
Abd El-Motaleb M. Ramadan ◽  
Ibrahim EL-Mehasseb ◽  
Shaban Y. Shaban
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Light Harvesting ◽  
Transfer Reactions ◽  
Electron Transfer Reactions

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...

Artificial Light-Harvesting Metallacycle System with Sequential Energy Transfer for Photochemical Catalysis

2021 ◽  
Vol 143 (3) ◽  
pp. 1313-1317
Author(s):  
Dengqing Zhang ◽  
Wei Yu ◽  
Suwan Li ◽  
Yan Xia ◽  
Xianying Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Artificial Light ◽  
Photochemical Catalysis

Photoresponsive chiral vesicles as a light harvesting matrix with tunable chiroptical properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhaozhen Cao ◽  
Aiyou Hao ◽  
Pengyao Xing
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Cotton Effect ◽  
Chiroptical Properties ◽  
Self Assembled

Self-assembled vesicles show photoresponsive Cotton effect and CPL activities, which also perform as a matrix for energy transfer-based CPL material.

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