Results 111 to 120 of about 1,024 (137)
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Equilibrium Adsorption Values of Leuco Vat Dyes on Cotton
Journal of the Society of Dyers and Colourists, 1957The equilibrium adsorption of a series of leuco vat dyes on cotton has been measured in various concentrations of sodium chloride and sodium hydroxide. From the results the thermodynamic affinities have been calculated. Deviations from theory are observed in so far as the affinities are not constant, but show a regular drift as the concentration of ...
R. H. PETERS, H. H. SUMNER
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ChemInform Abstract: AROMATIC ALDEHYDE‐LEUCO DYE PHOTOXIDATION
Chemischer Informationsdienst, 1977AbstractTris‐(dimethylaminophenyl)methan‐ Leukofarbstoffe (I) werden in Gegenwart aromatischer Aldehyde, insbesondere solcher der Formel (II), rasch zu den Farbstoffen der Formel (III) photooxidiert, wobei die Quantenausbeuten ca. 750 betragen.
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Chemistry and Applications of Leuco Dyes
2002Spiropyran Leuco Dyes H. Nakazumi. Leuco Quinone Dyes M. Matsuoka. Thiazine, Oxazine, and Phenazine Leuco Dyes T. Van Thien. Synthesis and Properties of Phthalide-Type Color Formers I.J. Fletcher, R. Zink. The Chemistry of Leuco Triarylmethanes R. Muthyala, X. Lan. The Chemistry of Fluoran Leuco Dyes Y. Hatano.
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The analysis of indigoid dyes as leuco forms by NMR spectroscopy*
Coloration Technology, 20001H and 13C NMR spectra of halogen‐ and alkoxy‐substituted indigoid dyes (indigotins), and of some unknown deuterated indigotins as leuco forms (i.e., reduced forms or ‘vats’), in deuterium oxide are recorded and discussed. NMR spectroscopy is a useful technique for the identification and characterisation of this traditional class of vat dyes.
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The Chemistry of Fluoran Leuco Dyes
2005In our information-oriented society, computer and facsimile are being widely used as a means for transmitting information. Carbonless copying papers and thermosensitive recording papers, which utilize a color-formation reaction between leuco dyes and acidic compounds, have won high regard as recording papers used with these office machines.
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Importance of Solvent Polarity in the Equilibrium Reaction of Leuco Dye and Developer
Chemistry Letters, 2006Abstract The absorbance of the leuco dye and developer solution system showed a maximum by the change of solvent polarity, and a clear correlation between the ratio of coloring species at the maximum and the dielectric constant of polar solvents has been revealed.
Yumiko Sekiguchi +3 more
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Russian Journal of Applied Chemistry, 2008
The effect of humates isolated from peat on the state in solution of the leuco acid of Vat Brilliant Green C dye was examined spectrophotometrically and compared with the effect of dispersants traditionally used in textile-chemical processes: disodium methylenebis(naphthalenesulfonate) and triethanolamine.
I. Yu. Vashurina +2 more
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The effect of humates isolated from peat on the state in solution of the leuco acid of Vat Brilliant Green C dye was examined spectrophotometrically and compared with the effect of dispersants traditionally used in textile-chemical processes: disodium methylenebis(naphthalenesulfonate) and triethanolamine.
I. Yu. Vashurina +2 more
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Molecular Structures of the Coloring Species of a Leuco Dye with Phenolic Color Developers
Chemistry Letters, 2007Abstract We have isolated the coloring species of a leuco dye colored by three phenolic color developers and have revealed their molecular structures by X-ray crystallographic analysis for the first time: one leuco dye molecule combined with one developer molecule by the hydrogen bonds between the carboxylate anion of a leuco dye and the
Yumiko Sekiguchi +3 more
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Vaporization Thermodynamics of Leuco Dyes: Measurement and Prediction
SSRN Electronic Journal, 2022Andrey A. Sokolov +4 more
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Analytica Chimica Acta, 1982
Abstract A one-phase, one-reagent, spectrophotometric technique is reported for the detection and determination of anionic surfactants of the sulfonate and sulfate types. Both applications are based on conversion of the colorless leuco-bases of triphenylmethane dyes (Brilliant Green and methyl violet) to colored (quinoid) forms by the anionic ...
Harvey Pobiner, Henry T. Hoffman
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Abstract A one-phase, one-reagent, spectrophotometric technique is reported for the detection and determination of anionic surfactants of the sulfonate and sulfate types. Both applications are based on conversion of the colorless leuco-bases of triphenylmethane dyes (Brilliant Green and methyl violet) to colored (quinoid) forms by the anionic ...
Harvey Pobiner, Henry T. Hoffman
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