Dyeing properties of CI acid blue 193 and the non-equivalent properties of CI acid black 194 produced by different manufacturers / Krzysztof Wojciechowski in COLORATION TECHNOLOGY, Vol. 130, N° 3 (06/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 3 (06/2014) . - p. 215-220 Titre : Dyeing properties of CI acid blue 193 and the non-equivalent properties of CI acid black 194 produced by different manufacturers Type de document : texte imprimé Auteurs : Krzysztof Wojciechowski, Auteur ; Lucjan Szuster, Auteur ; Joanna Rutowicz, Auteur ; Anna Kaminska, Auteur Année de publication : 2014 Article en page(s) : p. 215-220 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie Colorants azoïques Polyamides Un polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine. Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères. Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : This paper presents the results of research conducted into the colour properties of commercial metal complex dyes CI Acid Blue 193 and CI Acid Black 194. Three chromium(III) complexes with different colours were identified using thin-layer chromatographic analysis and then separated by preparative chromatography. It was found that colour differences of the examined dyes depend on the ratio of the three components in CI Acid Blue 193 and CI Acid Black 194, and that these differences are typical for each of the commercial products. The colour differences of the components were expressed as ?S, calculated as the difference in the areas under the absorption curve of the individual components in the range 400–700 nm after spectrum normalisation. The UV-vis spectroscopic and CIELAB colorimetric properties (at 1% owf on polyamide) of eleven samples of CI Acid Black 194 were investigated. From these results, the proportions of the three components were derived. Theoretically, dyes sold under the same CI name are interchangeable. In practice, the obtained colour of the dyed material is different owing to the difference in composition namely the ratio of the components in the tested dyes. Consequently, the result of polyamide dyeing with the studied dyes CI Acid Blue 193 and CI Acid Black 194 is a redder or greener hue. It has been concluded from these findings that the production of identical dyeings may be impossible when dyes from different sources are employed. DOI : 10.1111/cote.12084 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12084 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21463 [article]

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Prediction of photofading of N-B-hydroxyethylamino-o-nitrophenyl derivatives : a theoretical study / Krzysztof Wojciechowski in COLORATION TECHNOLOGY, Vol. 137, N° 2 (04/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 2 (04/2021) . - p. 134-144 Titre : Prediction of photofading of N-B-hydroxyethylamino-o-nitrophenyl derivatives : a theoretical study Type de document : texte imprimé Auteurs : Krzysztof Wojciechowski, Auteur ; Lucjan Szuster, Auteur Année de publication : 2021 Article en page(s) : p. 134-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cheveux -- Teinture Colorants -- Détérioration Décoloration Photodétérioration Index. décimale : 668.5 Parfums et cosmétiques Résumé : Until now, the lightfastness of hair dyes had not been investigated using all-valence molecular orbital methods. The results of calculations are used to obtain the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) frontier electron density, which can reflect the propensity for electrophilic or nucleophilic attack at an atom in a molecule. Using semi-empirical quantum chemical methods AM1 and PM3, we have calculated the reactivity rates urn:x-wiley:14723581:media:cote12517:cote12517-math-0001, superdelocalisability urn:x-wiley:14723581:media:cote12517:cote12517-math-0002 and electron density distribution in the tested dyes. We have found that the photooxidation of hair dyes (photochemical decomposition of hair dyes) and derivatives of N-B-hydroxyethylamino-o-nitrobenzene occurs through the degradation of the N-B-hydroxyethylamine substituent and on C2 or C4 atom (C4–NO2) in the process of electrophilic reaction with singlet oxygen 1O2 or nucleophilic reaction on the C1 carbon atom of the aromatic ring, with the use of superoxide anion radical O2&. The structures of the dyes were optimised using MM+, DM and AM1 or PM3 until constant energy value was realised with a 0.01 kcal/mol convergence criterion. DOI : https://doi.org/10.1111/cote.12517 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12517 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36073 [article]

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Prediction of the photofading of 1-H or 1-ethyl derivatives of 3-cyano-6-hydroxy-4-methyl-5-(p-X-phenylazo)-2-pyridone dyes and their azo-hydrazone tautomerism: A theoretical study / Krzysztof Wojciechowski in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 314-329 Titre : Prediction of the photofading of 1-H or 1-ethyl derivatives of 3-cyano-6-hydroxy-4-methyl-5-(p-X-phenylazo)-2-pyridone dyes and their azo-hydrazone tautomerism: A theoretical study Type de document : texte imprimé Auteurs : Krzysztof Wojciechowski, Auteur ; Lucjan Szuster, Auteur Année de publication : 2023 Article en page(s) : p. 314-329 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Détérioration Colorants azoïques Orbitales moléculaires Photodétérioration Prévision, Théorie de la Index. décimale : 667.3 Teinture et impression des tissus Résumé : The lightfastness calculations for photofading of monoazo pyridone dyes were performed. For this purpose, all-valence molecular orbital method PM3 was applied. Frontier electron density distribution on the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) was examined. The obtained parameters seem to reflect the tendency for an electrophilic attack with a singlet oxygen (1O2) atom or a nucleophilic attack with superoxide anion (O2●─) on a particular atom in a molecule. Reactivity indicators for superdelocalisability ( ) and electron density distribution in ground and excited state were calculated. Superdelocalisabilities enable the fastness values to be explained in different chemical molecules depending on tautomeric forms in which they may occur. DOI : https://doi.org/10.1111/cote.12649 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12649 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39541 [article]

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The application of the microwave irradiation to the synthesis of azo pigments / Krzysztof Wojciechowski in PAINTINDIA, Vol. LVII, N° 3 (03/2007)

[article]  inPAINTINDIA > Vol. LVII, N° 3 (03/2007) . - p. 105-115 Titre : The application of the microwave irradiation to the synthesis of azo pigments Type de document : texte imprimé Auteurs : Krzysztof Wojciechowski, Auteur ; Zbigniew Niewiadomski, Auteur ; Agnieszka Szymczak, Auteur Année de publication : 2007 Article en page(s) : p. 105-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques Micro-ondes Traitement par irradiation Index. décimale : 667.9 Revêtements et enduits Résumé : Synthesis of monoazo and disazo pigments by means of microwave (mv) irradiation has been investigated. As a medium able to cause the conversion of irradiation water was used. The results of pigments synthesis with the use ofmv energy were compared with the results of synthesis of analogical dyes obtained by means of the "classic" method. The carried out examinations showed that on the yield of the reaction with the use ofmv irradiation have an influence: the kind of diazo and coupling component, the microwave power and time of irradiation. In some cases the "microwave" method appeared to be the more efficient one as the "classic" method. Note de contenu : - Experimental : Synthesis of monoazo pigments - Synthesis of disazo pigments - Spectrophotometric analysis - Discussion of results : The results of synthesis of monoazo pigments - The results of synthesis of disazo pigments - Spectrophotometric analysis Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11469 [article]

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