Photochemistry of Dyes

Meier, Harald

doi:10.1016/b978-0-12-717004-6.50014-x

Cited by 31 publications

(8 citation statements)

References 519 publications

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“…Therefore they are one of the most popular group of dyes and have found many applications in industry [1]. Additionally, azo dyes have very high extinction coefficient and give bright, intensive colour by using small concentrations.…”

Section: Introductionmentioning

confidence: 99%

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

2009

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A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4 -cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.

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Section: Introductionmentioning

confidence: 99%

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

2009

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“…As a result the concentration of the dye changes from point to point, and integrating Equation 14 in the general case is not possible. This speciality of solid phase photochemical processes is not considered in references [33,36], and integration is made of Equation 14 without consideration of concentration of the absorbing centers of the depth 1.1…”

Section: Reactions On Concentrationmentioning

confidence: 99%

“…Equations obtained in refs [7,33,36]. are correct if the matrix in which the absorbing substance is distributed is optically transparent, while the optical density is small.at FLORIDA INTERNATIONAL UNIV on July 7, 2015 trj.sagepub.com Downloaded from…”

mentioning

confidence: 99%

Light Stability of Dyed Fibers

Ershov¹,

Кричевский²

1975

Textile Research Journal

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“…+ D -*D-+ R + Hf (1) *D-+ H' (or H20) -+ *DII (-I-OH-) (2) where RH. under conditions such that these radicals were the only species reacting with the various dyes present in solution.…”

Section: Introductionmentioning

confidence: 99%

Reduction of dyes by free radicals in solution. Correlation between reaction rate constants and redox potentials

Rao¹,

Hayon²

1973

J. Phys. Chem.

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Publication costs assisted by Natick LaboratoriesThe reactions of some free radicals (RH-) with a number of organic dyes (D) have been examined in aqueous solutions, using the. fast-reaction technique of pulse radiolysis. The radicals studied include CHzOH, (CH&COH, NHzCHCOO-, G O H (C = cytosine), .TH (TH2 = dihydrothymine), and C H 2and were produced by reaction of the substrates with OH radicals. The dyes used were Crystal Violet, Safranine T , Phenosafranine, Indigo Di-and Tetrasulfonate, Methylene Blue, Thionine, Indophenol and 2,6-Dichloroindophenol. The electron transfer reaction, RH. + D -R + .D-+ H + (kl), were determined by following the bleaching kinetics of the dyes a t the wavelengths where they absorb. The rates were found to increase monotonically with increase in the redox potential E , of the dyes examined. Similarly the efficiencies (expressed in percentage) of these reactions were obtained and found to be markedly dependent upon the E , values of the dyes in the range from -0.357 to +0.217 V. These results are discussed and the suggestion made that this correlation represents the dependence upon AEm. the difference in the redox potentials of the donor radical and the acceptor dyes.

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Photochemistry of Dyes

Cited by 31 publications

References 519 publications

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

Light Stability of Dyed Fibers

Reduction of dyes by free radicals in solution. Correlation between reaction rate constants and redox potentials

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