Fluorescence quenching of chlorophyll-a in non-ionic micelles. Effect of micellar and quencher concentrations on the static and dynamic quenching parameters

1993 ◽  
Vol 89 (12) ◽  
pp. 1925 ◽  
Author(s):  
M. Isabel Viseu ◽  
S�lvia M. B. Costa
Keyword(s):  
Fluorescence Quenching ◽  
Chlorophyll A ◽  
Dynamic Quenching ◽  
Ionic Micelles ◽  
Static And Dynamic Quenching

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.

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.

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+.

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...

scholarly journals Seasonality and Small Spatial-Scale Variation of Chlorophyll a Fluorescence in Bryophyte Syntrichia ruralis [Hedw.] in Semi-Arid Sandy Grassland, Hungary

Plants ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 92 ◽  
Author(s):  
Ruchika ◽  
Zsolt Csintalan ◽  
Evelin Ramóna Péli
Keyword(s):  
Quantum Yield ◽  
Fluorescence Quenching ◽  
Spatial Scale ◽  
Chlorophyll A ◽  
Chlorophyll A Fluorescence ◽  
Small Spatial Scale ◽  
Variation Trend ◽  
Fluorescence Parameters ◽  
Semi Arid ◽  
Sandy Grassland

Bryophytes face challenges due to global climate change which is leading to in-depth research in monitoring and studying their photosynthetic activity. The aim of this preliminary experiment was to study the seasonal variation trend in the chlorophyll a fluorescence parameters, Fv/Fm (ratio of variable to maximum fluorescence), photochemical fluorescence quenching (qP), photochemical quantum yield of photosystem II (ΦPS II), fluorescence quenching (qN), and non-photochemical quenching (NPQ), in the moss cushions of Syntrichia ruralis [Hedw.] collected from semi-arid sandy dunes for two slopes i.e., north-east (NE) and south-west (SW) direction. Our results showed a seasonal and small-spatial scale variation trend in all chlorophyll fluorescence parameters. These variations are due to different seasonal conditions referring to different degrees of environmental stress. ΦPS II and qP values were maximum in winter and in spring seasons while Fv/Fm, NPQ and qN were maximum in summer. Based on the different exposition of dunes, the SW slope showed increased values of the effective quantum yield of PS II and qP in comparison to the NE slope due to the optimal microclimate conditions for their expansion. These results may refer to the future changing in diversification and coverage of the Syntrichia species in semi-arid sandy grassland due to more effective metabolism in the beneficial microclimatic conditions.

On the Fluorescence Quenching of Polycyclic Aromatic Hydrocarbons by Nitromethane

1975 ◽  
Vol 30 (10) ◽  
pp. 1311-1314 ◽  
Author(s):  
H. Dreeskamp ◽  
E. Koch ◽  
M. Zander
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Aromatic Hydrocarbons ◽  
High Energy ◽  
Dynamic Quenching ◽  
Quenching Mechanism ◽  
Polycyclic Aromatic ◽  
Acetonitrile Solutions ◽  
Alternant Hydrocarbons

Abstract Fluorescence quenching of 22 polycyclic aromatic hydrocarbons by nitromethane in toluene and acetonitrile solutions has been studied. Contrary to Sawicki’s observations that the fluorescence of hydrocarbons with the fluoranthene skeleton is not quenched that of 11.12-and 3.4-benzofluor-anthene and fluoranthene itself is quenched. These compounds have a high energy of the fluorescence transition. The fluorescence quenching of the compounds investigated follows a dynamic quenching mechanism. The bimolecular rate constant of fluorescence quenching increases exponentially with the energy of the fluorescing state of alternant hydrocarbons.

Static and dynamic quenching of phenanthrene excited triplet state by Cu (II) ions

1990 ◽  
Vol 46 (5) ◽  
pp. 311-318 ◽  
Author(s):  
N.P. Gritsan ◽  
V.V. Korolev ◽  
D.G. Sushkov ◽  
I.V. Khmelinski ◽  
N.M. Bazhin
Keyword(s):  
Triplet State ◽  
Excited Triplet State ◽  
Dynamic Quenching ◽  
Excited Triplet ◽  
Static And Dynamic Quenching

Static and dynamic quenching of luminescent species in polymer media

1994 ◽  
Vol 4 (4) ◽  
pp. 327-330 ◽  
Author(s):  
Paul Hartmann ◽  
Marc J. P. Leiner ◽  
Max E. Lippitsch
Keyword(s):  
Dynamic Quenching ◽  
Static And Dynamic Quenching
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