Aryl and heteroaryl azo dyes derived from 6, 8-dichloro-4-hydroxyquinolin-2 (1H)-one: synthesis, characterisation, solvatochromism and spectroscopic properties / Enayat Ollah Moradi Rufchahi in COLORATION TECHNOLOGY, Vol. 135, N° 5 (10/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 5 (10/2019) . - p. 391-406 Titre : Aryl and heteroaryl azo dyes derived from 6, 8-dichloro-4-hydroxyquinolin-2 (1H)-one: synthesis, characterisation, solvatochromism and spectroscopic properties Type de document : texte imprimé Auteurs : Enayat Ollah Moradi Rufchahi, Auteur ; Ali Ghanadsadeh Gilani, Auteur Année de publication : 2019 Article en page(s) : p. 391-406 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Colorants -- Propriétés spectrales Colorants -- Synthèse Colorants azoïques Solvatochromisme Index. décimale : 667.2 Colorants et pigments Résumé : In this research study, 6, 8-dichloro-4-hydroxyquinolin-2(1H)-one was prepared by the thermal cyclocondensation of 2-(2, 4-dichlorophenylcarbamoyl) acetic acid or N, N’-bis(2,4-dichlorophenyl)malonamide at 140-150°C in polyphosphoric acid, resulting in a yield of 48 %. This compound was then coupled with a series of diazonium salts derived from aromatic and heteroaromatic amines for synthesis of the corresponding azo dyes. The structures of the compounds were confirmed using elemental analysis as well as ultraviolet-visible, Fourier Transform-infrared and proton nuclear magnetic resonance spectroscopy. The effects of organic solvents with different polarities, pH values and substituents of the diazotising components on the maximum absorption wavelength of the colorants were discussed and evaluated in detail. The acidity constants (pKa) of the dyes were also determined using the spectrophotometric method in an ethanol-water mixture (80:20, v/v) at 20-23°C. Note de contenu : - EXPERIMENTAL : Materials and instrumentation - Synthesis and characterisation - RESULTS AND DISCUSSION : Synthesis and characterisation - UV-vis and solvatochromic studies of synthesised dyes - Determination of pKa value of the dyes in ethanol-aqueous buffer solution DOI : 10.1111/cote.12426 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12426 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33071 [article]

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Synthesis, characterization and application on leather of chromium (III), iron (II) and copper (II) complexes of novel pyrazole naphthol acid dyes in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 4 (07-08/2016)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 100, N° 4 (07-08/2016) . - p. 198-207 Titre : Synthesis, characterization and application on leather of chromium (III), iron (II) and copper (II) complexes of novel pyrazole naphthol acid dyes Type de document : texte imprimé Année de publication : 2016 Article en page(s) : p. 198-207 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Propriétés spectrales Colorants -- Propriétés tinctoriales Colorants -- Synthèse Colorants acides Complexes métalliques Cuirs et peaux -- Teinture Naphtols Pyrazoles Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A novel series of 4-amine-1-pheny1-3methyl-5-pyrazolone based metal complex azo acid dyes (1a-5d) has been prepared from p- Sulphophenyl methyl pyrazolone (1). The synthetic route included the nitrosation of the p-sulphophenyl methyl pyrazolone followed by the reduction to 4-amino-1-(p-sulphopheny1)-3-methy1-4-amino-5-pyrazolone. Diazotization of intermediate (II) and then coupling was done with Naphthol derivatives (1a-5d), in alkaline medium to produce different acid dyes. These dyes were further processed for metallization with 3d transition metals like iron ; chromium and copper. The structures of the novel dyes were confirmed by spectroscopic techniques. The synthesized dyes were applied on leather to evaluate their light fastness, wash fastness and perspiration fastness and must of the dyes were shown to possess high values (rafing 4-5). Note de contenu : - EXPERIMENTAL PROCEDURES : Materials and methods - General procedure for the synthesis of 1-(p-sulphophenyl)-3-methyl-5-pyrazolone based acid dyes - Dyeing method (rotary drum dyeing) - RESULTS AND DISCUSSION : Synthesis of dyes 1a-5d - Spectral properties of dyes - Dyeing properties of dyes En ligne : https://drive.google.com/file/d/1-Ep7iN5Dns_DEUA-y_ZldFxlQL03SYn-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26798 [article]

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