Photoswitchable Sensitization of Porphyrin Excited States

2006 ◽  
Vol 59 (3) ◽  
pp. 170 ◽  
Author(s):  
Stephen D. Straight ◽  
Yuichi Terazono ◽  
Gerdenis Kodis ◽  
Thomas A. Moore ◽  
Ana L. Moore ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Singlet State ◽  
Molecular Switches ◽  
Cyclic Form ◽  
Excited Singlet ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Covalently Linked

Light-driven molecular switches consisting of a porphyrin covalently linked to a fulgimide photochrome antenna have been prepared. Light absorbed by the cyclic form of the fulgimide is transferred to the porphyrin with ≥ 95% efficiency, generating the porphyrin first excited singlet state. Irradiation with visible light photoisomerizes the fulgimide to the open form, which does not absorb above 450 nm, and antenna function is abolished. UV irradiation converts the fulgimide back into the cyclic form, re-establishing efficient energy transfer. Photoisomerization of the fulgimide thus controls generation of the porphyrin excited state, which may then be used to carry out a variety of useful photochemical processes.

trans-4-Stilbenecarboxylatoalkylpentaamminecobalt(III) Perchlorates: Synthesis and Intramolecular Energy Transfer

1996 ◽  
Vol 61 (3) ◽  
pp. 342-354 ◽  
Author(s):  
Cyril Párkányi ◽  
Lois Shiow-Chyn Yeh Huang ◽  
Sung Gun Chu ◽  
Alfred T. Jeffries III
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Singlet State ◽  
Excitation Energy Transfer ◽  
Intramolecular Energy Transfer ◽  
Triplet Excited State ◽  
Excited Singlet ◽  
Fluorescence Studies ◽  
Methylene Groups ◽  
A Charge

Three homologs of trans-4-stilbenecarboxylic acid, viz., trans-4-stilbeneacetic acid (18), β-(trans-4-stilbene)propionic acid (19), and γ-(trans-4-stilbene)butyric acid (20) were synthesized and, together with the parent trans-4-stilbenecarboxylic acid, used to obtain the corresponding [ω-(trans-4-stilbene)carboxylatoalkylpentaamminecobalt(III) complexes, [(PhCH=CHC6H4(CH2)nCOO)Co(NH3)5]2+ (1-4), where n = 0, 1, 2, or 3. Fluorescence studies suggest that an intramolecular excitation energy transfer occurs from the first excited singlet state of the ligand to the metal giving rise to a charge-transfer triplet-excited state of the complex, based on the analogy with previous work on complex 1. The efficiency of the energy transfer seems to decrease with increasing number of the methylene groups in the ligand.

scholarly journals Energy transfer and formation of long-lived 3MLCT states in multimetallic complexes with extended highly conjugated bis-terpyridyl ligands

2016 ◽  
Vol 18 (4) ◽  
pp. 2350-2360 ◽  
Author(s):  
Maria Wächtler ◽  
Joachim Kübel ◽  
Kevin Barthelmes ◽  
Andreas Winter ◽  
Alexander Schmiedel ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited States ◽  
Efficient Energy Transfer ◽  
Efficient Energy

Multimetallic complexes with extended conjugated ligands show efficient energy transfer to the lowest excited states and prolonged Fe(ii) 3MLCT lifetimes.

Prediction of efficient energy transfer in emissive polymer blends based on Förster radius and the excited state lifetime of acceptors

2006 ◽  
Vol 6 (1) ◽  
pp. 59-65 ◽  
Author(s):  
Jae-Woong Yu ◽  
Jai Kyeong Kim ◽  
Dong Young Kim ◽  
Chulhee Kim ◽  
Nam Woong Song ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Polymer Blends ◽  
Excited State Lifetime ◽  
Efficient Energy Transfer ◽  
Efficient Energy

Intramolecular sensitization within steroids: Excited-state interaction of C-17 α and β carbon–bromine bonds with a C-6 carbonyl group

2003 ◽  
Vol 81 (6) ◽  
pp. 660-668 ◽  
Author(s):  
Wen-Shan Li ◽  
Lokman Torun ◽  
Harry Morrison
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Carbonyl Group ◽  
Singlet State ◽  
State Interaction ◽  
Excited Singlet State ◽  
Excited Singlet

The synthesis, photochemistry, and photophysics of 17α-bromo-3α-(triphenylsilyloxy)-5α-androstan-6-one (1) and 17β-bromo-3β-(triphenylsilyloxy)-5α-androstan-6-one (2) have been studied in aqueous tetrahydrofuran. The 17α-bromo isomer gives evidence (reduced ϕf, τ1, and ϕisc for the ketone) for interaction between the ketone and C–Br moieties in the excited singlet state. Some photodehalogenation is also observed upon excitation of the ketone chromophore. This interaction seems to be absent or minimal for the 17β-bromo isomer.Key words: photodehalogenation, bromosteroid, ketosteroid, intramolecular singlet–singlet energy transfer (ISSET).

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...

Efficient Energy Transfer in Mixed Columnar Stacks of Hydrogen-Bonded Oligo(p-phenylene vinylene)s in Solution

2004 ◽  
Vol 43 (15) ◽  
pp. 1976-1979 ◽  
Author(s):  
Freek J. M. Hoeben ◽  
Laura M. Herz ◽  
Clément Daniel ◽  
Pascal Jonkheijm ◽  
Albertus P. H. J. Schenning ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Phenylene Vinylene ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Hydrogen Bonded

Hybrid organic/inorganic semiconductor nanostructures with highly efficient energy transfer

2012 ◽  
Vol 22 (21) ◽  
pp. 10816 ◽  
Author(s):  
Diana Savateeva ◽  
Dzmitry Melnikau ◽  
Vladimir Lesnyak ◽  
Nikolai Gaponik ◽  
Yury P. Rakovich
Keyword(s):  
Energy Transfer ◽  
Semiconductor Nanostructures ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Highly Efficient ◽  
Inorganic Semiconductor
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