Photochemical funnel in stiff conjugated polymers: interplay between defect mediated polymer conformations, side chain interactions and resonance energy transfer

2013 ◽  
Vol 109 ◽  
pp. 36 ◽  
Author(s):  
Biman Bagchi
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Side Chain

Tuning the interfacial and energetic interactions between a photoexcited conjugated polymer and open-shell small molecules

Soft Matter ◽  
2019 ◽  
Vol 15 (6) ◽  
pp. 1413-1422 ◽  
Author(s):  
Daniel A. Wilcox ◽  
Jordan Snaider ◽  
Sanjoy Mukherjee ◽  
Long Yuan ◽  
Libai Huang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Small Molecules ◽  
Conjugated Polymer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Open Shell ◽  
Förster Resonance Energy Transfer ◽  
Energetic Interactions ◽  
Förster Resonance

Photoexcited conjugated polymers are capable of exchanging energy with open-shell small molecules through a Förster Resonance Energy Transfer (FRET) mechanism.

scholarly journals π-Conjugated polymers with pendant coumarins: design, synthesis, characterization, and interactions with carbon nanotubes

2016 ◽  
Vol 94 (9) ◽  
pp. 759-768 ◽  
Author(s):  
Mokhtar Imit ◽  
Patigul Imin ◽  
Alex Adronov
Keyword(s):  
Carbon Nanotubes ◽  
Energy Transfer ◽  
Conjugated Polymers ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Coupling Reaction ◽  
Coumarin Derivative ◽  
Design Synthesis ◽  
Quenching Efficiency ◽  
Photoluminescence Studies

A series of new fluorene-based π-conjugated polymers having coumarin derivatives as part of dendritic side chains were designed and prepared using the Suzuki–Miyaura cross-coupling reaction. A new coumarin derivative bearing a heptyl side chain for solubility was utilized to ensure solubility of the final polymers. It was found that fluorescence resonance energy transfer (FRET) from the coumrains to the polyfluorene backbone was efficient, especially for the polymers decorated with lower-generation dendrons. Each of the polymers was found to interact strongly with the surface of single-walled carbon nanotubes (SWNTs) in THF, and their ability to selectively disperse specific SWNT chiralities was investigated. Photoluminescence studies revealed that the strong polymer emission is efficiently quenched in the corresponding supramolecular complexes with SWNTs. This high quenching efficiency indicates that the coumarin–polymer FRET system can be supramolecularly bound to the surface of (SWNTs to produce an energy transfer system in which the energy absorbed by the donor coumarin chromophores is channeled to the SWNTs.

scholarly journals Two-Step Energy Transfer Dynamics in Conjugated Polymer and Dye-Labeled Aptamer-Based Potassium Ion Detection Assay

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1206 ◽  
Author(s):  
Inhong Kim ◽  
Ji-Eun Jung ◽  
Woojin Lee ◽  
Seongho Park ◽  
Heedae Kim ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Fluorescence Intensity ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Fluorescence Decay ◽  
Transfer Efficiency ◽  
Detection Systems ◽  
Detection Assay ◽  
Highly Sensitive Detection

We recently implemented highly sensitive detection systems for photo-sensitizing potassium ions (K+) based on two-step Förster resonance energy transfer (FRET). As a successive study for quantitative understanding of energy transfer processes in terms of the exciton population, we investigated the fluorescence decay dynamics in conjugated polymers and an aptamer-based 6-carboxyfluorescein (6-FAM)/6-carboxytetramethylrhodamine (TAMRA) complex. In the presence of K+ ions, the Guanine-rich aptamer enabled efficient two-step resonance energy transfer from conjugated polymers to dyed pairs of 6-FAM and TAMRA through the G-quadruplex phase. Although the fluorescence decay time of TAMRA barely changed, the fluorescence intensity was significantly increased. We also found that 6-FAM showed a decreased exciton population due the compensation of energy transfer to TAMRA by FRET from conjugated polymers, but a fluorescence quenching also occurred concomitantly. Consequently, the fluorescence intensity of TAMRA showed a 4-fold enhancement, where the initial transfer efficiency (~300%) rapidly saturated within ~0.5 ns and the plateau of transfer efficiency (~230%) remained afterward.

scholarly journals Non-radiative resonance energy transfer in bi-polymer nanoparticles of fluorescent conjugated polymers

2010 ◽  
Vol 18 (2) ◽  
pp. 670 ◽  
Author(s):  
Ilkem Ozge Ozel ◽  
Tuncay Ozel ◽  
Hilmi Volkan Demir ◽  
Donus Tuncel
Keyword(s):  
Energy Transfer ◽  
Conjugated Polymers ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Polymer Nanoparticles

Quantum Dot Bioconjugates as Energy Donors in Fluorescence Resonance Energy Transfer Assays

2003 ◽  
Vol 773 ◽  
Author(s):  
Aaron R. Clapp ◽  
Igor L. Medintz ◽  
J. Matthew Mauro ◽  
Hedi Mattoussi
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Genetically Engineered ◽  
Molar Ratio ◽  
Binding Assays ◽  
Specific Sequence ◽  
Donor Acceptor

AbstractLuminescent CdSe-ZnS core-shell quantum dot (QD) bioconjugates were used as energy donors in fluorescent resonance energy transfer (FRET) binding assays. The QDs were coated with saturating amounts of genetically engineered maltose binding protein (MBP) using a noncovalent immobilization process, and Cy3 organic dyes covalently attached at a specific sequence to MBP were used as energy acceptor molecules. Energy transfer efficiency was measured as a function of the MBP-Cy3/QD molar ratio for two different donor fluorescence emissions (different QD core sizes). Apparent donor-acceptor distances were determined from these FRET studies, and the measured distances are consistent with QD-protein conjugate dimensions previously determined from structural studies.

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