Carnivorous Wasps

Thomas, Edward

doi:10.1038/030408c0

Cited by 2 publications

(2 citation statements)

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“…Table presents the values calculated from the sphere of action quenching model for 3OCE respectively. The solute radii R s and the quencher radii R q were determined as proposed by Edward and are given in Table , respectively. Encounter distance R was determined by the sum of the solute and quencher molecular radii.…”

Section: Resultsmentioning

confidence: 99%

Effect of preferential solvation and bimolecular quenching reactions on 3OCE in acetonitrile and 1,4‐dioxane binary mixtures by optical absorption and fluorescence studies

Muttannavar¹,

Melavanki

Sharma

et al. 2019

Luminescence

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Fluorescence quenching and preferential solvation of a coumarin derivative, namelywith aniline used as a quencher in solvent mixtures of acetonitrile (AN) and 1,4dioxane (DX) was carried out at steady state. Suppan's theory of dielectric enrichment was used to understand the nonideality and dielectric enrichment in AN-DX solvent mixtures. The effect of viscosity and dielectric constant variation at room temperature were analyzed. Quenching was characterized using Stern-Volmer plots with an upward curvature. It was found that 3OCE underwent combined static and dynamic quenching that was evident from the quenching rate parameters. KEYWORDS3OCE, bimolecular quenching reactions and diffusion limited reaction, preferential solvation, Suppan's theory of dielectric enrichment

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Section: Resultsmentioning

confidence: 99%

Effect of preferential solvation and bimolecular quenching reactions on 3OCE in acetonitrile and 1,4‐dioxane binary mixtures by optical absorption and fluorescence studies

Muttannavar¹,

Melavanki

Sharma

et al. 2019

Luminescence

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“…Since the concentrations of the solute and quencher are very low, the viscosity of the solute and quencher are taken to be the same as that of the medium. The radii of the solvent, solute and quencher molecules are calculated by adding the atomic volumes of all the atoms constituting the molecules as suggested by Edward [13], and these values are given in the Table. The Stokes-Einstein number, αχ = αY = αQ = 6 is chosen since the values of diffusion coefficients determined experimentally agree with the calculated values for αχ = αY = αQ = 6 at different temperatures. The diffusion coefficients thus determined using Eq.…”

Section: Resultsmentioning

confidence: 99%

On the Mechanism of Excitation Energy Transfer Involving Long and Short Range Interaction in Dilute Organic Liquid Scintillator Systems

1992

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Tle rate parameter K3 of solvent-solute energy transfer and the rate parameter Κ7b for solvent-quencher energy transfer are determined experimentally under ultraviolet excitation for a system Ethyl 1 butyl-2-methyl-5 ethoxycarboxy methoxy indole-3-carboxylate (EBMEC) in a deoxygenated system comprising 1:9 mixture of toluene-cyclohexane as a function of temperature in the range of 20-70°C, using bromobenzene as a solvent quencher. The data is analysed in terms of compact equation formed b y combining Voltz et al. and Birks and Conte models. The interaction distance for the energy transfer from the excited solvent to solute molecules and solvent to quencher molecules are determined using this equation. The magnitude of the interaction distance indicates that the excitation energy transfer takes place due to long-range interaction in the case of solvent-solute energy transfer and short-range interaction in the case of solvent quencher energy transfer in dilute systems.PACS numbers: 34.30.+h IntroductionIt is well-known that in organic liquid scintillation the transfer of excitation energy from solvent to solute molecules is due to (a) Brownian diffusion, (b) energy migration and (c) resonance interaction due to Förster process. Various energy transfer models [1][2][3][4] have been suggested to understand the role played by these above-mentioned processes. Voltz et al. [1] have proposed that all the three processes (a,b,c) play an important role, whereas Birks and Conte [2] have proposed that only the diffusion and the migration processes play an important role in the energy transfer from solvent to solute molecules. Other models are also proposed recently [5][6][7]. The purpose of the present investigation is to determine

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Carnivorous Wasps

Cited by 2 publications

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Effect of preferential solvation and bimolecular quenching reactions on 3OCE in acetonitrile and 1,4‐dioxane binary mixtures by optical absorption and fluorescence studies

Effect of preferential solvation and bimolecular quenching reactions on 3OCE in acetonitrile and 1,4‐dioxane binary mixtures by optical absorption and fluorescence studies

On the Mechanism of Excitation Energy Transfer Involving Long and Short Range Interaction in Dilute Organic Liquid Scintillator Systems

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