Investigations of absorption and emission spectral data in mixed liquid media. A short review of recent literature

Homocianu, Mihaela; Airinei, Anton

doi:10.1016/j.molliq.2015.06.042

Cited by 21 publications

(9 citation statements)

References 78 publications

(86 reference statements)

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“…Here solvent mixtures permit better characterization of the relationship between quenching parameters and solvent properties. Additionally, extensive literature survey provides just a few reports for studies on quenching of fluorescent compounds in binary mixtures . Dielectric constant variation ranges from 36.0 (for acetonitrile) to 2.1 (for 1, 4‐dioxane) and viscosity varies from 0.3443 (for acetonitrile) to 1.178 (for 1, 4‐dioxane) by the change of composition of the present solvents.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, extensive literature survey provides just a few reports for studies on quenching of fluorescent compounds in binary mixtures. [34] Dielectric constant variation ranges from 36.0 (for acetonitrile) to 2.1 (for 1, 4-dioxane) and viscosity varies from 0.3443 (for acetonitrile) intensity but also reduces the lifetime of the fluorophore in the excited state. In the case of FRET, in its electronically excited state, energy of a donor molecule is transferred to acceptor molecule through non-radiative dipole-dipole coupling.…”

Section: Introductionmentioning

confidence: 99%

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Effect of viscosity and dielectric constant variation on fractional fluorescence quenching analysis of coumarin dye in binary solvent mixtures

Bhavya¹,

Melavanki

Kusanur³

et al. 2018

Luminescence

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Photo physical properties of fluorescent organic compounds give an immense improved knowledge on characteristics of excited state that is beneficial to devise innovate molecules and understand their performance in particular applications. Coumarin derivatives have been extensively investigated in this regard. This article narrates steady state fluorescence quenching measurements of a coumarin derivative namely 3-hydroxy-3-[2-oxo-2-(3-oxo-3H-benzo[f]chromen-2-yl)-ethyl]-1,3-dihydro-indol-2-one (3HBCD) in a binary mixture of acetonitrile and 1,4-dioxane. Aniline is used as quencher. Fluorescence intensity is large in acetonitrile and decreases as the percentage of 1,4-dioxane in the solvent mixture increases. With modest quencher concentration a deviation towards the x axis is noticed in the Stern-Volmer (S-V) plots. This downward curvature is interpreted as due to the presence of 3HBCD in different conformers in the lowest energy level. Ground state intramolecular hydrogen bonding formation is observed due to the conformational changes in the solute. Figured estimations of various quenching parameters recommend that, while dynamic quenching prompts linearity in S-V plot at lower quencher concentration, increasing quenching efficiency with increasing medium viscosity suggests that reaction is not entirely controlled by material diffusion. Stern-Volmer constant increases with decreasing medium dielectric constant.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of viscosity and dielectric constant variation on fractional fluorescence quenching analysis of coumarin dye in binary solvent mixtures

Bhavya¹,

Melavanki

Kusanur³

et al. 2018

Luminescence

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“…The effect of binary mixtures on the spectroscopic characteristics of a solute is very complex and therefore difficult to predict. The observed effect could be due to specific solvation of CPT in the acetonitrile/water mixture, to changes in the polarity, and/or to changes in the hydrogen bonding of this solvent mixture 53,54 .…”

Section: S2 (G) Esi †)mentioning

confidence: 99%

Photosensitized reactions initiated by 6-carboxypterin: singlet and triplet reactivity

Tinel

Rossignol

Ciuraru

et al. 2016

Phys. Chem. Chem. Phys.

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Pterins, derivatives of 2-aminopteridin-4(3H)-one, are natural photosensitizers, common to many biological systems. Indications that these photosensitizers are also present in the sea-surface microlayer motivated the study of the photophysical and photochemical properties of 6-carboxypterin (CPT), which was chosen as a model for this group of photoactive compounds. The kinetics of excited CPT in the singlet and triplet state in the presence of halides and organics were studied in aqueous solutions at neutral pH by means of steady-state fluorescence and laser-flash photolysis. The fluorescence of CPT was efficiently quenched by two halides (iodide and bromide) and by four carboxylic acids (lactic, malonic, propionic and citric acid) with reaction rates close to the diffusion-controlled limit. In the triplet state, the triplet absorption spectrum was measured and its pH dependence was studied. The triplet state of CPT showed relatively high reactivity towards iodide, but no reaction with bromide or chloride could be observed. No singlet or triplet state quenching in the presence of limonene could be measured. A reaction mechanism is proposed, initiated by electron transfer from the quencher to the excited photosensitizer. This type of photo-induced reaction in the sea-surface microlayer has the potential to trigger the production of many oxidized species, including halogen atoms, in the bulk and gaseous phases.

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“…[1][2][3][4][5][6][7][8][9][10] The main aspects regarding solvatochromism from the last seven years was recently reviewed in the literature. 11 Flavonoids are a class of benzopyrone compounds richly available in fruits, wines, teas, seeds and vegetables. Flavonoids are well known due to their functionality, including anti-inflammatory, antimicrobial, antioxidant, anti-HIV activities, anticancer and topoisomerase inhabitation.…”

Section: Faraji and Farajtabarmentioning

confidence: 99%

Solvatochromism of naringenin in aqueous alcoholic mixtures

Faraji

Farajtabar

2016

JSCS

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The spectral change of naringenin in binary mixtures of water with methanol, ethanol or 1-propanol was studied by UV-Vis spectrophotometry at 25 °C. The effect of the solvent was investigated by analysis of the electron transition energy at the maximum absorption wavelength as a function of the Kamlet and Taft parameters of the mixtures by means of linear solvation energy relationships. The nonlinear response of the solvatochromism was explained based on solute-solvent and solvent-solvent interactions. The possible preferential solvation of naringenin by each of the solvents was studied through a modified preferential solvation model that considers the hydrogen bonding interactions between the prior solvents due to solvent-solvent interactions. The preferential solvation parameters and local mole fraction distribution around the solute were calculated. The results indicated that naringenin prefers to be more solvated by the complex solvating species and organic solvents than water.

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Investigations of absorption and emission spectral data in mixed liquid media. A short review of recent literature

Cited by 21 publications

References 78 publications

Effect of viscosity and dielectric constant variation on fractional fluorescence quenching analysis of coumarin dye in binary solvent mixtures

Effect of viscosity and dielectric constant variation on fractional fluorescence quenching analysis of coumarin dye in binary solvent mixtures

Photosensitized reactions initiated by 6-carboxypterin: singlet and triplet reactivity

Solvatochromism of naringenin in aqueous alcoholic mixtures

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