Photon harvesting polymers: intracoil energy transfer in anthryl- and fluorescein-tagged polystyrene

1985 ◽  
Vol 63 (6) ◽  
pp. 1320-1327 ◽  
Author(s):  
J. S. Hargreaves ◽  
S. E. Webber
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Time Dependence ◽  
Solvent Mixture ◽  
Dynamic Quenching ◽  
Absorption Of Light ◽  
Polymer Coil ◽  
Static And Dynamic Quenching ◽  
Coil Size ◽  
Solvent Analysis

Polystyrene containing small mole fractions of pendent 9,10-diphenylanthracene (DPA) and fluorescein (F) was prepared. Absorption of light by DPA results in very efficient intracoil sensitization of the 1F* state. The quantum efficiency (χ) of this process has been estimated as 0.75 in dimethylformamide (DMF) and 0.95 in 5:1 DMF/H2O. The increase in χ in this latter solvent mixture is ascribed to the diminished polymer coil size in this poorer solvent. Analysis of the time dependence of fuorescence suggests a combined static and dynamic quenching of 1(DPA)* by energy transfer. Studies of 1(DPA)* and 1(F)* fluorescence quenching by DABCO corroborate this model.

scholarly journals Fluorescence Quenching of DMB by Aniline in Benzene-Acetonitrile Mixture

2016 ◽  
Vol 65 ◽  
pp. 32-36 ◽  
Author(s):  
Ashok H. Sidarai ◽  
Vani R. Desai ◽  
Shirajahammad M. Hunagund ◽  
Mahantesha Basanagouda ◽  
Jagadish S. Kadadevarmath
Keyword(s):  
Fluorescence Quenching ◽  
Room Temperature ◽  
Solvent Mixture ◽  
Static Quenching ◽  
Solvent Mixtures ◽  
Dynamic Quenching ◽  
Approximation Model ◽  
Positive Deviation ◽  
Coumarin Dye ◽  
Static And Dynamic Quenching

The fluorescence quenching of coumarin dye namely 4-(2,6-dibromo-4-methyl-phenoxymethyl)-benzo[h]chromen-2-one [DMB] has been studied by aniline, in a different solvent mixture of benzene (BN) and acetonitrile (AN) at room temperature. The quenching is found to be appreciable and shows positive deviation from linearity in the Stern-Volmer (S-V) plots for all the solvent mixtures. The various rate parameters responsible for fluorescence quenching have been determined using a sphere of action static quenching model and finite sink approximation model. The magnitudes of these rate parameters indicate that positive deviation in the S-V plot is due to both static and dynamic quenching processes.

Formation of CT complexes and electron transfer from excited molecules of anthracene derivatives to methylviologen in aqueous and micellar media

1987 ◽  
Vol 52 (7) ◽  
pp. 1658-1665
Author(s):  
Viktor Řehák ◽  
Jana Boledovičová
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Formation Constants ◽  
Dynamic Quenching ◽  
Micellar Media ◽  
Complex Formation Constants ◽  
Anthracene Derivatives ◽  
Ct Complexes

Disodium 1,5- and 1,8-anthracenedisulphonate (ADS) and 9-acetylanthracene form coloured CT complexes with methylviologen (MV2+) in aqueous and micellar media. The complex formation constants and molar absorptivities were determined by the Benesi-Hildebrandt method. In the fluorescence quenching, its static component plays the major role. The dynamic quenching component is determined by the rate constant of electron transfer from the S1 state of ADS to MV2+.

scholarly journals Graphdiyne nanosheets as a platform for accurate copper(ii) ion detection via click chemistry and fluorescence resonance energy transfer

RSC Advances ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 5320-5324
Author(s):  
Chenchen Ge ◽  
Jiaofu Li ◽  
Dou Wang ◽  
Kongpeng Lv ◽  
Quan Liu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Click Chemistry ◽  
Fluorescence Resonance Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
High Specificity ◽  
Ion Detection ◽  
Fluorescence Resonance

Cu2+ detection was performed by taking advantage of the fluorescence quenching ability of graphdiyne and the high specificity of click chemistry.

Do equilibrium and rate constants of intramicellar reactions depend on micelle size ?

2021 ◽  
Author(s):  
Tim Kohlmann ◽  
Martin Goez
Keyword(s):  
Rate Constants ◽  
Methyl Viologen ◽  
Alkyl Sulfate ◽  
Dynamic Quenching ◽  
Micelle Size ◽  
Static And Dynamic Quenching

We have studied the combined static and dynamic quenching of pyrene by methyl viologen in sodium alkyl sulfate micelles varying in volume by a factor of more than 4. Size...

A Unified Fluorescence Quenching Mechanism of Tetrazine-Based Dyes: Energy Transfer to a Dark State

2021 ◽  
Author(s):  
Weijie Chi ◽  
Lu Huang ◽  
Chao Wang ◽  
Davin Tan ◽  
Zhaochao Xu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Quenching Mechanism ◽  
Dark State ◽  
Medical Diagnostic ◽  
Fluorogenic Probes ◽  
Fluorescence Quenching Mechanism ◽  
Diagnostic Applications

Tetrazine-based fluorogenic probes are powerful tools for bioimaging, biosensing, and medical diagnostic applications. In these probes, the attachment of a tetrazine moiety generates a non-fluorescent precursor; upon the bio-orthogonal reaction...

Fluorescence energy transfer studies in a cross-linked polyurethane network

1995 ◽  
Vol 73 (11) ◽  
pp. 1823-1830 ◽  
Author(s):  
Jie Yang ◽  
Mitchell A. Winnik
Keyword(s):  
Energy Transfer ◽  
Fluorescence Quenching ◽  
Fluorescence Decay ◽  
Critical Distance ◽  
Nonradiative Energy Transfer ◽  
Fluorescence Energy Transfer ◽  
Distribution Analysis ◽  
Analysis Method ◽  
Acceptor Concentration ◽  
Fluorescence Energy

A series of cross-linked polyurethane samples, labeled with dyes suitable for fluorescence energy transfer experiments, were prepared (donor, phenanthrene; acceptor, anthracene). Fluorescence decay profiles for these samples were measured as a function of acceptor concentration. These decays obey Förster nonradiative energy transfer kinetics, with an energy transfer critical distance (R0) of 26.7 Å. Fluorescence intensities, calculated from the decays by integrating the decay profiles, also fit the Perrin model, with a quenching radius (Rs) of 25.6 Å. The fluorescence decay profiles were further examined with a distribution analysis method, which also revealed uniformly distributed donors and acceptors in the polymer matrices. Keywords: fluorescence quenching, fluorescence decay, phenanthrene, anthracene, polyurethane.

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