Results 171 to 180 of about 4,618 (202)
Some of the next articles are maybe not open access.
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.
openaire +1 more source
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.
openaire +1 more source
The Chemistry of Esters of Leuco Vat Dyes. V– The Action of Light
Journal of the Society of Dyers and Colourists, 1965The rates of reaction, under the influence of light, of the sulphuric acid esters of several leuco vat dyes have been measured in the presence of different amounts of hydrogen peroxide. The results can be explained if light causes hydrolysis of the sulphuric ester to the leuco vat dye, and it has been possible to demonstrate this reaction by ...
O. H. CLAUSSEN, A. JOHNSON, P. T. KAMDAR
openaire +1 more source
A tight binding model of the bond dissociation mechanism in thermochromic leuco dyes
Journal of Molecular Structure, 2020Abstract It has long been known that heat, UV light, or protonization will cause the bond in Leuco dye's to break. The underlying microscopic mechanism is a still a matter of discussion. It stands to reason that a local model should correctly predict the temperature behavior of the heat capacity at the thermochromic phase transition.
C.B. Nelson +3 more
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Vaporization Thermodynamics of Leuco Dyes: Measurement and Prediction
SSRN Electronic Journal, 2022Andrey A. Sokolov +4 more
openaire +1 more source
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
openaire +1 more source
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
openaire +1 more source
Unexpected Regioselectivity in the Sulfonation of Leuco Xanthene Dyes
The Journal of Organic Chemistry, 1994Paul R. Carlier +2 more
openaire +1 more source