Photofading of Azo Pyridone Dyes in Solution
- 1 May 1990
- journal article
- research article
- Published by SAGE Publications in Textile Research Journal
- Vol. 60 (5), 297-300
- https://doi.org/10.1177/004051759006000508
Abstract
We report on the investigation and kinetic measurements of the photofading process of some o-, p-substituted azo pyridone dyes in formamide, N,N-dimethylformamide, and N,N'-dimethylacetamide. The free energies of solvation of dyes in the three solvents have been calculated by measuring the distribution coefficients of the dyes between the amide solvent and n-hexane as the immiscible standard solvent. A fair linear correlation exists between the observed rate constant and the free energies of transfer, suggesting the possibility that the photofading rate increases with increasing solvation of dyes; moreover it is increased by two electron-withdrawing substituents.Keywords
This publication has 6 references indexed in Scilit:
- Photodegradation of acid dyes in nylon filmsJournal of the Society of Dyers and Colourists, 1988
- Photofading mechanisms of dyes in solution and polymer mediaColoration Technology, 1987
- The effect of singlet oxygen quenchers with additional u.v. absorbing functionality on the photofading of acid dyesJournal of the Society of Dyers and Colourists, 1987
- Photofading Kinetics and Thermodynamics of Some Azo Disperse Dyes in Amide Solvents under the Influence of Far Ultra–violet RadiationJournal of the Society of Dyers and Colourists, 1984
- Solvent and substituent on the thermal isomerization of substituted azobenzenes. Flash spectroscopic studyJournal of the American Chemical Society, 1971
- Photochemistry of azo compounds. III. Evidence for an electron-transfer process in amine solventsJournal of the American Chemical Society, 1969