Cation-Anionic Association of Organic Dyes in Aqueous Solutions: Structure and Properties of Associates

Shapovalov, S. A.

doi:10.22606/mocr.2017.24006

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Association as a result of the manifestation of intermolecular interactions is accompanied by an increase or decrease in light absorption and changes in spectral bands. For many years, the formation of stable stoichiometric associations between oppositely charged dye ions has been experimentally proven [1][2][3][4][5][6][7][8][9] even at low (1•10 -6 -1•10 -5 mol/L) concentrations. It is shown that "non-Coulomb" interactions are essential in the processes of cation-anion association of dyes or other polyatomic (organic) particles.…”

Section: Introductionmentioning

confidence: 99%

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

S.A

2021

Bull. Sci. Res.

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The ability of rhodamine cations to form cation-anionic associates with tetraphenylborate-anion in an aqueous solution has been studied. The thermodynamic values of the equilibrium association constants Kasт were determined spectrophotometrically. The values of a number of properties of dye molecules (surface area, effective volume, hydrophobicity index log P, standard enthalpy of hydration ΔНohydr) were calculated using the QSAR model. The possibility of dependence of the value of Kasт on these factors has been reviewed. It was shown that changes in lg Kasт in the series of rhodamine associates are consistent with changes in the parameters log P and ΔНohydr.

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Section: Introductionmentioning

confidence: 99%

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

S.A

2021

Bull. Sci. Res.

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“…For dye molecules, improvements in absorption and emissions properties of dye solutions were found over a century ago when the temperature variation changed and these improvements were correctly due to aggregation. Following the discovery of Jaggregation, many efforts have been made to grasp the structural and spectral properties of dye aggregates and investigate the related phenomena in important technical fields, including photographic research [8].…”

Section: Introductionmentioning

confidence: 99%

Study Interionic Attraction of anionic dyes by Electrolytic Conductivity Measurement

gomaa

2020

Al-Azhar Bulletin of Science

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Measurements of conductivity in aqueous solution are recommended for studying the behavior of some dyes. The conductivity of two azo dyes C.I. Acid Red 151 (AR 151) and C.I. Mordant green 17 (MG17) have been studied. The ionization degree, α and Van , t Hoff's factor ,i, were calculated. Their values decrease with increasing dye concentration and increase with increasing temperature. The mobility, µ, the activation energy, E, were also calculated. The findings indicate that interionic attractions and connections are present. Dye ions tend to selfassociate. Since these textile dyes were applied from aqueous systems, it is important to understand the association of dyes. The molecular aggregation of two sulphonated dyes studied by measuring the electrolytic conductivity in aqueous solutions as a function of dye concentration and temperature. Aggregation number, aggregation constant and shape of aggregate were calculated. As expected, the aggregation number decreases with increasing temperature, and that tends to J-aggregation which enhance the devices performance such as xerography, sensors, dye sensitized solar cells (DSSCs). In identifying new dyes for (DSSCs), multiple criteria such as broad absorption spectra, stable metal oxide binding and reduced aggregation of dye need to be considered.

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“…The association of the "dye -surfactant" type has a special interest due to certain features (the presence of spectral changes at sufficiently low concentrations of reagents at the level of 10 -6 M and even less). In general, association models and thermodynamics (association constants, enthalpy of formation and Gibbs energy) and other parameters (surface tension, the surface area per surfactant molecule at the water/air interface and others) were determined for different classes of dyes [9][10][11][12][13][14][15][16][17][18][19]. There are studies to find effective ways to extract some dyes from various media using surfactants [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

Shapovalov

Ponomariov

2019

ILCPA

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Interactions of sulforhodamine B or ethyl eosin (as the anionic dye) with cetylpyridinium bromide (as a cationic surfactant) have been investigated by visible spectroscopy in aqueous solution. The object of research is the association between an anion of dye and of cationic surfactant in aqueous solutions and its features. Computer simulation of these interactions was carried out with the use of AM1 and PM3 semi-empirical methods. A new spectrophotometric method was developed for determination of critical micelle concentration of cationic surfactants.

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Cation-Anionic Association of Organic Dyes in Aqueous Solutions: Structure and Properties of Associates

Cited by 6 publications

References 20 publications

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

Association of rhodamine cations with tetraphenylborate-anion in aqueous solution: structural properties of ions and stability of associates

Study Interionic Attraction of anionic dyes by Electrolytic Conductivity Measurement

Interaction of Dyes with Cationic Surfactants in Solutions: Determination of Critical Micelle Concentration

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